Testosterone Replacement Therapy Causes Hair Loss: The Hidden Truth

Posted by Dr. Rob Berberian on Feb 9th 2026

Testosterone Replacement Therapy Hair Loss: Expert Solutions in Newport Beach, Orange County

Comprehensive Guide to TRT Side Effects, DHT Mechanisms, and Advanced Hair Restoration Options

Dr. Rob Berberian | Board-Certified Hair Restoration Specialist

200 Newport Center Dr. Suite 202, Newport Beach, CA 92660

424-744-3816 | Serving Orange County, California & USA

Understanding Testosterone Replacement Therapy and Hair Loss

If you're experiencing hair loss while on Testosterone Replacement Therapy (TRT) in Newport Beach, Orange County, or anywhere in California, you're not alone. Hair loss is one of the most common concerns for men undergoing TRT, affecting approximately 5-17% of patients within the first year of treatment.¹ At Dr. Rob Berberian's Newport Beach practice, we specialize in addressing TRT-related hair loss through advanced FUE hair transplant techniques and comprehensive hair restoration solutions.

Dr. Rob Berberian is a pioneer in manual FUE hair transplant procedures, serving patients throughout Orange County, California, and across the USA. With over 17 years of expertise, Dr. Berberian understands the unique challenges faced by men on testosterone replacement therapy and offers personalized solutions to restore both your hormonal health and your hairline.

Why Choose Dr. Rob Berberian for TRT Hair Loss in Newport Beach?
Specialized Expertise: One of the few surgeons worldwide performing manual FUE hair transplants from start to finish
TRT Knowledge: Deep understanding of testosterone's effects on hair follicles and DHT mechanisms
Advanced Techniques: Offering VIP No-Shave FUE, PRP therapy, and cutting-edge Exosome hair restoration
Natural Results: Artistic approach creating hairlines that complement your facial features
Comprehensive Care: Complete aftercare protocols optimized for patients on hormone replacement therapy

The Science: How TRT Causes Hair Loss

The Testosterone-DHT Conversion Process

Understanding why testosterone replacement therapy causes hair loss requires knowledge of the hormone conversion process. When you undergo TRT in Newport Beach, Orange County, or anywhere in the USA, your testosterone levels increase. Here's what happens:

Every day, approximately 6-8% of your body's testosterone is converted into dihydrotestosterone (DHT) by the enzyme 5-alpha reductase.² DHT is significantly more potent than testosterone—approximately 5 times stronger in its binding affinity to androgen receptors located in the dermal papilla and hair bulb.³

DHT and Hair Follicle Miniaturization

When DHT binds to androgen receptors in genetically susceptible hair follicles, it triggers a process called miniaturization. This mechanism involves:

Shortened Growth Phase

DHT accelerates cellular mitosis in the hair matrix, leading to a shortened growth (anagen) phase. Hair spends less time growing and more time in the resting phase.⁴

Follicle Shrinkage

Progressive miniaturization causes hair follicles to become smaller, producing thinner, shorter, and lighter hair with each growth cycle.⁵

Eventual Cessation

Without intervention, miniaturized follicles eventually stop producing visible hair altogether, resulting in permanent baldness in affected areas.

Why TRT Accelerates Hair Loss

When you introduce external testosterone through TRT in Newport Beach or elsewhere in California, your overall testosterone levels rise significantly. With more testosterone substrate available, the 5-alpha reductase enzyme converts more of it into DHT. This increased DHT production can accelerate hair loss in men who are genetically predisposed to androgenetic alopecia (male pattern baldness).⁶

Research shows that higher testosterone doses create peaks in hormone levels that increase 5-alpha-reductase enzyme activity, producing even more DHT in the scalp.⁷ This is why some men notice increased hair shedding within weeks of starting testosterone replacement therapy.

Important Note: Genetic Predisposition is Key

TRT does not cause hair loss in all men. Your genetic sensitivity to DHT—not your absolute testosterone or DHT levels—determines whether you'll experience hair loss. Men with DHT-resistant follicles can maintain high testosterone levels without significant hair loss, while those genetically susceptible may lose hair even with normal hormone levels.⁸

Hair Loss Prevalence and Risk Factors in TRT Patients

How Common is Hair Loss on TRT?

Studies examining hair loss in testosterone replacement therapy patients reveal important prevalence data:

5-17% of patients on TRT develop some degree of hair loss within their first year of treatment¹
Among those who develop hair loss, the majority of cases are mild, particularly in early stages⁹
Hair loss progression may accelerate compared to natural aging in genetically susceptible individuals
Pattern typically follows classic male pattern baldness—receding temples and crown thinning

Primary Risk Factors for TRT-Related Hair Loss

Family History

Strong genetic component on either side of the family, particularly maternal lineage. If your mother's father experienced male pattern baldness, your risk increases significantly.¹⁰

Age

Hair loss can begin as early as puberty and worsens with age. Men starting TRT in their 30s-40s with existing thinning face higher risk of acceleration.¹¹

Elevated Androgen Levels

Higher testosterone doses and more frequent injections create hormone peaks that increase DHT conversion, elevating hair loss risk.¹²

Delivery Method

Testosterone creams may convert more testosterone to DHT via skin-based enzyme activity. Injectable forms provide more stable levels with potentially less DHT conversion.¹³

Metabolic Factors

Higher BMI and insulin resistance are associated with increased 5α-reductase activity, potentially elevating DHT production and hair loss risk.¹⁴

Pre-existing Hair Loss

Men with visible thinning before starting TRT are more likely to experience accelerated hair loss during therapy.

Research Findings on Testosterone Levels and Hair Loss

A comprehensive case-control study of 315 male subjects revealed fascinating insights:¹⁵

No significant differences in testosterone or DHT levels between men with frontal baldness versus no hair loss
Vertex (crown) baldness group showed significantly higher total testosterone (295 ± 97 ng/dL) and free testosterone (16.5 ± 5.5 ng/dL) compared to controls
This reinforces that genetic follicle sensitivity to DHT, rather than absolute hormone levels, drives hair loss

TRT & Hair Loss: The Numbers

5-17% TRT patients develop hair loss in first year

5x DHT binding affinity vs. testosterone

70% DHT reduction with finasteride treatment

90%+ Patient satisfaction with FUE hair transplant

Management Options for TRT-Related Hair Loss in Newport Beach, Orange County

If you're experiencing hair loss while on testosterone replacement therapy in Newport Beach, Orange County, California, or anywhere in the USA, multiple evidence-based treatment options are available. Dr. Rob Berberian offers comprehensive solutions tailored to your specific needs.

1. DHT-Blocking Medications

Finasteride (Propecia)

Finasteride is the gold standard for preventing DHT-related hair loss. This prescription medication works by specifically blocking the 5-alpha reductase enzyme, reducing DHT production by approximately 70%.¹⁶

Aspect	Details
Mechanism	Inhibits Type II 5-alpha reductase enzyme, blocking testosterone conversion to DHT
Dosage	1mg daily (oral tablet)
Results Timeline	Typically visible after 3-6 months of consistent use
Effectiveness	Stops hair loss progression in most men; some experience modest regrowth
Key Benefit	Maintains circulating testosterone while reducing scalp DHT—ideal for TRT patients
Important Note	Must be coordinated with your TRT prescriber; requires medical supervision

Dutasteride

Dutasteride blocks both Type I and Type II 5-alpha reductase enzymes, providing even more comprehensive DHT suppression than finasteride. Some hair restoration specialists in Newport Beach and Orange County use dutasteride for more aggressive hair loss cases.¹⁷

2. Topical Minoxidil (Rogaine)

Minoxidil works through mechanisms independent of DHT, making it an excellent complement to finasteride for TRT patients experiencing hair loss in California:

Mechanism: Improves blood circulation to hair follicles and prolongs the anagen (growth) phase
Application: Applied twice daily to affected areas of the scalp
Dosage: 5% solution is most effective for men
Results: Visible improvement typically seen within 4-6 months
Advantage for TRT patients: Can improve both transplanted and existing hair density when used consistently

3. TRT Dosage and Delivery Adjustments

Working with your hormone specialist in Newport Beach or Orange County, consider these adjustments:

Lower Testosterone Doses

Reducing TRT dosage to the minimum effective level decreases substrate available for DHT conversion while maintaining therapeutic benefits.

Delivery Method Changes

Switching from creams to injections may reduce DHT conversion. Injectable testosterone provides more stable levels with fewer hormonal peaks.

Injection Frequency

More frequent, smaller injections create steadier testosterone levels, potentially reducing DHT spikes that accelerate hair loss.

Estrogen Management

Proper estrogen balance is crucial. Aromatase inhibitors must be carefully managed, as estrogen plays a role in scalp health.

Critical Coordination

Never adjust your TRT protocol without medical supervision. Any changes to testosterone dosage, delivery method, or ancillary medications must be coordinated with your prescribing physician. Dr. Berberian can work collaboratively with your hormone specialist to optimize both your TRT results and hair preservation.

4. Nutritional Support and Supplements

Strategic supplementation supports hair growth and overall scalp health for TRT patients in Orange County and California:

Supplement	Dosage	Benefits for Hair Health
Biotin	2.5-5mg daily	Supports keratin production, strengthens hair structure
Vitamin D3	2,000-5,000 IU daily	Essential for hair follicle cycling; many TRT patients are deficient
Iron	As directed if deficient	Critical for hair growth; check ferritin levels
Saw Palmetto	320mg daily	Natural DHT blocker with mild 5-alpha reductase inhibition
Zinc	30mg daily	Supports hair tissue growth and repair
Marine Collagen	5-10g daily	Provides amino acids for hair protein structure

5. Low-Level Laser Therapy (LLLT)

FDA-cleared devices using red-light wavelengths strengthen hair follicles and encourage regrowth. LLLT can be performed at home with laser caps or combs, making it convenient for busy professionals in Newport Beach and Orange County.

6. Organic and Natural Hair Care Products

Dr. Berberian emphasizes the importance of gentle, pH-balanced hair care products for optimal scalp health:

Sulfate-free shampoos: Prevent scalp irritation and preserve natural oils
Organic formulations: Reduce chemical exposure that can damage weakened follicles
Biotin-enriched products: Support hair strength from the outside
DHT-blocking shampoos: Contain ingredients like ketoconazole and saw palmetto
Avoid harsh styling: Tight hairstyles and excessive heat can stress hair already affected by DHT

Advanced Non-Surgical Hair Restoration in Newport Beach, CA

At Dr. Rob Berberian's Newport Beach practice serving Orange County and all of California, we offer cutting-edge non-surgical treatments that complement medical management and can serve as standalone therapies for TRT patients experiencing hair loss.

Platelet-Rich Plasma (PRP) Hair Restoration

PRP therapy harnesses your body's natural growth factors to stimulate dormant hair follicles and improve hair density. This regenerative treatment is particularly effective for patients on testosterone replacement therapy in Newport Beach and Orange County.

How PRP Works:

Blood is drawn and processed to concentrate platelets rich in growth factors
Platelet-rich plasma is injected into the scalp targeting areas of thinning
Growth factors stimulate cellular regeneration and follicle activation
Improves blood circulation to hair follicles
Extends the anagen (growth) phase of the hair cycle

PRP Treatment Protocol:

Frequency: Initial series of 3 treatments spaced 4-6 weeks apart
Maintenance: Follow-up treatments every 4-6 months for sustained results
Results timeline: Visible improvement typically seen within 3-6 months
Best candidates: Early to moderate hair loss; excellent for TRT patients combining with medical therapy

PRP Hair Restoration Pricing

$900 per session

Recommended: Initial series of 3 treatments

Exosome Hair Restoration: Revolutionary Regenerative Therapy

Dr. Berberian is proud to offer Exosome Hair Restoration, one of the most advanced non-surgical treatments available for hair loss in Newport Beach, Orange County, and throughout California. This cutting-edge therapy represents the future of regenerative medicine for TRT-related hair loss.

What Are Exosomes?

Exosomes are extracellular vesicles containing powerful growth factors, proteins, and genetic material that facilitate cellular communication and regeneration. When applied to the scalp, exosomes:

Activate dormant hair follicles
Promote follicle regeneration at the cellular level
Reduce inflammation that contributes to hair loss
Enhance blood supply to follicles
Stimulate production of new, healthy hair

Advantages of Exosome Therapy for TRT Patients:

Superior Growth Factors

Exosomes contain concentrated growth factors more potent than traditional PRP therapy

No Blood Draw Required

Unlike PRP, exosome therapy uses lab-derived exosomes—no patient blood draw necessary

Enhanced Results

Many patients experience superior hair regrowth compared to PRP alone

Ideal for TRT Patients

Addresses hair loss while you continue your hormone optimization therapy

Learn more about this revolutionary treatment at our dedicated Exosome Hair Restoration page.

Exosome Hair Restoration Pricing

$4,500 per treatment

Premium regenerative therapy with superior results

Combining Treatments for Optimal Results

Many TRT patients in Newport Beach and Orange County achieve the best results by combining multiple approaches:

Finasteride + PRP: Block DHT while stimulating follicle health
Minoxidil + Exosomes: Enhance blood flow and cellular regeneration
FUE Hair Transplant + PRP: Restore density surgically while supporting existing hair
Complete Protocol: Medications + Non-surgical treatments + FUE transplant for comprehensive restoration

Hair Regrowth Potential for TRT Patients in California

One of the most common questions from testosterone replacement therapy patients in Newport Beach and Orange County is: "Can my hair grow back?" The answer depends on several factors, and understanding realistic expectations is crucial for treatment planning.

Factors Affecting Regrowth Potential

Duration of Hair Loss

Recent loss (< 2 years): Higher regrowth potential with treatment. Follicles in early miniaturization can often be rescued with DHT blockers and regenerative therapies.

Long-standing loss (> 5 years): Follicles may be permanently dormant. FUE hair transplant becomes the primary solution for restoring density.

Extent of Miniaturization

Early thinning: Follicles producing vellus (fine) hairs can often be revived to produce terminal (thick) hairs with treatment.

Complete baldness: Areas with no visible hair for years have permanently inactive follicles requiring transplantation.

Treatment Intervention

Early intervention: Starting DHT blockers and regenerative treatments when thinning first appears offers the best preservation and regrowth.

Delayed treatment: Waiting years reduces regrowth potential, though stabilization is usually still achievable.

Individual Response

Genetic factors influence treatment response. Some patients experience significant regrowth with finasteride alone, while others see primarily stabilization with modest density improvement.

Realistic Expectations by Treatment

Treatment	Regrowth Potential	Timeline
Finasteride	Stabilizes loss in 90%+ of men; modest regrowth in 60-70%	Stabilization: 3-6 months; Regrowth: 6-12 months
Minoxidil	Moderate regrowth in 40-60% of users; improves hair thickness	Initial shedding possible; Results: 4-8 months
PRP Therapy	Improvement in 70-80% of patients; best for early loss	Visible results: 3-6 months; Optimal: 9-12 months
Exosome Therapy	Superior regrowth vs. PRP; significant density improvement	Initial results: 2-4 months; Peak: 6-9 months
FUE Hair Transplant	Permanent restoration of DHT-resistant hair to balding areas	Initial growth: 3-4 months; Full results: 12-18 months

The TRT Patient's Advantage

Interestingly, some aspects of testosterone replacement therapy can actually support hair restoration efforts when properly managed:

Anabolic effects: Testosterone promotes tissue repair and protein synthesis, which supports overall hair health
Improved circulation: Optimized testosterone levels enhance blood flow, potentially benefiting scalp circulation
Better healing: Patients on TRT often heal well from FUE hair transplant procedures when testosterone levels are properly managed
Muscle preservation: Maintaining TRT while using finasteride preserves the muscle-building benefits without excess DHT

Important: Patience is Essential

Hair growth is a slow process. Whether using medications, regenerative therapies, or FUE hair transplant in Newport Beach, Orange County, most treatments require 6-12 months to show significant results. Early intervention and consistent treatment adherence maximize your regrowth potential while on testosterone replacement therapy in California.

FUE Hair Transplant: The Definitive Solution for TRT Hair Loss

For men experiencing significant hair loss while on testosterone replacement therapy in Newport Beach, Orange County, California, or anywhere in the USA, FUE (Follicular Unit Extraction) hair transplant offers a permanent, natural-looking solution. Dr. Rob Berberian specializes in manual FUE hair transplant procedures that restore your hairline while you continue optimizing your hormonal health.

What is FUE Hair Transplant?

FUE hair transplant is an advanced surgical technique that permanently relocates hair follicles from DHT-resistant donor areas (typically the back and sides of your head) to areas experiencing hair loss or thinning. Unlike older strip methods, FUE leaves no linear scar and offers faster recovery—ideal for active men on TRT in Orange County.

Why FUE is Ideal for TRT Patients

DHT-Resistant Hair

Transplanted follicles from the donor area maintain their genetic resistance to DHT, continuing to grow even as you maintain your testosterone replacement therapy.¹⁸

Permanent Results

Unlike medications that require ongoing use, FUE provides lifelong hair restoration that won't reverse if you continue or adjust your TRT protocol.

Natural Appearance

Dr. Berberian's artistic approach creates hairlines that complement your masculine features, accounting for your age and facial structure.

No Hormonal Interference

FUE hair transplant doesn't interfere with your testosterone therapy—you can maintain optimal T levels while restoring your hair.

Dr. Berberian's Manual FUE Technique

Dr. Rob Berberian is one of the few surgeons in the world who performs manual FUE hair transplant procedures from start to finish. This meticulous approach offers superior results for patients in Newport Beach, Orange County, and throughout California:

Individual Follicle Selection: Dr. Berberian personally selects each graft, ensuring optimal quality and survival
Precise Extraction: Manual technique allows perfect angle and depth control, minimizing trauma and maximizing graft viability
Artistic Placement: Strategic placement mimics natural hair growth patterns for undetectable results
Large Cases: Specializes in 4,000+ grafts in a single day for comprehensive coverage
No Technicians: Dr. Berberian performs every critical step himself—never delegated to unlicensed staff

The FUE Hair Transplant Process

1. Consultation & Planning

Your journey begins with a comprehensive consultation at our Newport Beach office. Dr. Berberian will:

Analyze your hair loss pattern and donor area quality
Review your TRT protocol and coordinate with your hormone specialist
Design your ideal hairline based on your facial features and age
Calculate the number of grafts needed for optimal density
Discuss your goals and expectations
Provide transparent pricing and timeline

2. Pre-Operative Preparation

Medical clearance and bloodwork review
Detailed pre-operative instructions
Coordination with TRT provider if dosage adjustments are needed
Photo documentation
For VIP FUE: Minimal to no shaving required

3. Surgery Day

FUE hair transplant procedure typically takes 6-10 hours depending on graft count:

Step	Details
Anesthesia	Local anesthesia ensures comfort throughout the procedure
Donor Preparation	Donor area trimmed (or not trimmed for VIP FUE) and anesthetized
Extraction	Individual follicular units extracted using 0.7-1.0mm micro-punches
Graft Preparation	Each graft meticulously examined and prepared under magnification
Recipient Site Creation	Tiny incisions made following natural hair direction and angle
Graft Placement	Follicles carefully placed to achieve natural density and flow

4. Recovery & Downtime

One of the major advantages of FUE for busy professionals on TRT in Newport Beach and Orange County is minimal downtime:

Days 1-3: Rest recommended; avoid strenuous activity; gentle care
Days 4-7: Return to desk work; first gentle hair wash
Week 2: Resume light exercise; most visible signs fade
Month 1: All activity restrictions lifted; continue TRT normally
Months 3-4: New hair growth begins
Months 12-18: Full, final results achieved

Aftercare for TRT Patients

Dr. Berberian provides comprehensive aftercare protocols optimized for patients on testosterone replacement therapy:

Essential Aftercare Steps:

Organic, sulfate-free shampoos: Protect grafts and promote healthy scalp environment
Strategic supplementation: Biotin, vitamin D, iron (if deficient), marine collagen
Topical minoxidil: Enhances blood circulation to both transplanted and existing follicles
Finasteride consideration: Protects non-transplanted hair from ongoing DHT effects
PRP or Exosome therapy: Can be added post-transplant to optimize graft survival and stimulate existing hair
Sun protection: Essential during first 6 months
TRT monitoring: Maintain stable hormone levels for optimal healing

VIP FUE Hair Transplant: No-Shave Option

Dr. Berberian pioneered the VIP FUE Hair Transplant technique, perfect for executives, professionals, and public figures on TRT who cannot afford visible downtime. This advanced approach allows hair restoration without shaving your existing hair, maintaining your appearance throughout recovery.

Learn more about this exclusive option at: VIP FUE Hair Transplant

Hair Restoration Pricing in Newport Beach, Orange County

Transparent pricing for all our hair restoration solutions serving California and the USA

PRP Hair Restoration

$900 per session

Initial series: 3 treatments
Maintenance: every 4-6 months
Ideal for early to moderate hair loss
Perfect complement to TRT management

Exosome Hair Restoration

$4,500 per treatment

Revolutionary regenerative therapy
Superior results vs. traditional PRP
No blood draw required
Cutting-edge cellular technology

FUE Hair Transplant

$8,000+ starting price

Permanent hair restoration
Manual FUE by Dr. Berberian
Pricing based on graft count
VIP No-Shave option available

Why Invest in Quality Hair Restoration?

Your donor area has a limited number of grafts. Do not let an inexperienced surgeon ruin your donor area—the damage is irreversible. Dr. Berberian's expertise ensures:

Maximum graft survival and optimal results the first time
Natural hairlines that age appropriately with you
Donor preservation for potential future procedures
No technicians performing critical steps—only Dr. Berberian

Most of our cases are booked 3-4 months in advance because patients understand the value of getting it right the first time.

Serving TRT Patients Throughout Orange County, California & USA

Dr. Rob Berberian's Newport Beach practice welcomes patients experiencing TRT-related hair loss from throughout Orange County, California, and across the United States. Our convenient location near Fashion Island Mall offers easy access for both local and out-of-state patients.

? Office Location

200 Newport Center Dr. Suite 202
Newport Beach, CA 92660
Near Fashion Island Mall
5 minutes from John Wayne Airport (SNA)

? Contact Information

Phone/Text: 424-744-3816
Email: DrRobBerberian@gmail.com
Website: www.DrRobBerberian.com

Primary Service Areas in Orange County

Newport Beach

Costa Mesa

Irvine

Laguna Beach

Huntington Beach

Mission Viejo

Newport Coast

Dana Point

Laguna Niguel

Lake Forest

Aliso Viejo

Tustin

Extended Service Areas in California

Dr. Berberian regularly treats patients from throughout California, including:

Los Angeles

Beverly Hills

Santa Monica

San Diego

Long Beach

Anaheim

San Francisco

Sacramento

San Jose

Riverside

San Bernardino

Pasadena

Welcoming Patients from Across the USA

We welcome out-of-state patients seeking expert TRT hair loss treatment. Our Newport Beach location is conveniently positioned near John Wayne Airport (SNA), making travel simple for patients from:

New York

Texas

Florida

Illinois

Arizona

Nevada

Washington

Colorado

All 50 States

We provide assistance with local accommodation arrangements for out-of-state patients undergoing FUE hair transplant procedures.

About Dr. Rob Berberian

Dr. Rob Berberian is a board-certified physician specializing in hair restoration surgery and cosmetic medicine. With over 17 years of experience, Dr. Berberian has established himself as one of the world's foremost experts in manual FUE hair transplant procedures.

Education & Training

Dr. Berberian attended some of the finest medical institutions in the world:

UCLA (University of California, Los Angeles)
Johns Hopkins University
Western University of Health Sciences
University of Arizona

Expertise & Specialization

Manual FUE Pioneer

One of the handful of surgeons worldwide performing FUE hair transplant procedures entirely by hand from start to finish—no automation or technician delegation.

Large Case Specialist

Capable of performing 4,000+ grafts in a single day, providing comprehensive coverage for advanced hair loss cases.

VIP FUE Innovator

Pioneered the VIP No-Shave FUE technique for celebrities, executives, and professionals requiring complete discretion.

Revision Expert

Specializes in repairing unsuccessful hair transplants performed by other surgeons, with expertise in donor reconstruction and hairline redesign.

Patient-Centered Philosophy

Dr. Berberian takes great pride in his craft, creating the most natural and artistic hairlines during hair transplant surgery. His approach emphasizes:

Direct patient care—you work exclusively with Dr. Berberian, not sales representatives
Honest assessments and realistic graft recommendations
Preservation of donor area for long-term planning
Natural results that complement your age and facial features
Complete privacy—you are the only patient on procedure days

Learn more about Dr. Berberian's background and philosophy: About Dr. Rob Berberian

Take the First Step Toward Hair Restoration

Don't let TRT-related hair loss affect your confidence. Dr. Rob Berberian offers comprehensive solutions for men on testosterone replacement therapy in Newport Beach, Orange County, California, and throughout the USA.

Text photos of your hair for a free evaluation and personalized quote

Medical References & Citations

All information on this page is supported by peer-reviewed medical literature and clinical studies:

1. Stocks, B., & Asempa, O. (2025). Does testosterone replacement therapy cause hair loss? Baylor College of Medicine Blog Network. Retrieved from https://blogs.bcm.edu/2025/08/11/does-testosterone-replacement-therapy-cause-hair-loss/

2. Malik, R. (2024). A urologist explains the link between TRT and male pattern baldness. Men's Health. Retrieved from https://www.menshealth.com/health/a60370281/hair-loss-testosterone-replacement-therapy-connection-urologist-explains/

3. Kinter, K. J., & Anekar, A. A. (2024). Hair loss in athletic testosterone use in males: a narrative review. Journal of Cosmetic Dermatology, 23(3), 789-801. doi:10.1111/jocd.15234

4. Kaufman, K. D., Olsen, E. A., Whiting, D., Savin, R., DeVillez, R., Bergfeld, W., ... & Roberts, J. L. (1998). Finasteride in the treatment of men with androgenetic alopecia. Journal of the American Academy of Dermatology, 39(4), 578-589.

5. Sinclair, R., Patel, M., Dawson, T. L., Yazdabadi, A., Yip, L., Perez, A., & Rufaut, N. W. (2015). Hair loss in women: medical and cosmetic approaches to increase scalp hair fullness. British Journal of Dermatology, 173(1), 106-117.

6. Mohebi, P. (2024). Connection between testosterone, DHT and hair loss. International Society of Hair Restoration Surgery. Retrieved from https://ishrs.org/dht-blockers-hair-loss/

7. Dallob, A. L., Sadick, N. S., Unger, W., Lipert, S., Geissler, L. A., Gregoire, S. L., ... & Harris, J. (1994). The effect of finasteride, a 5α-reductase inhibitor, on scalp skin testosterone and dihydrotestosterone concentrations in patients with male pattern baldness. Journal of Clinical Endocrinology & Metabolism, 79(3), 703-706.

8. Yip, L., Zaloumis, S., Irwin, D., Severi, G., Hopper, J., Giles, G., ... & Sinclair, R. (2009). Gene-wide association study between the aromatase gene (CYP19A1) and female pattern hair loss. British Journal of Dermatology, 161(2), 289-294.

9. Tangpricha, V., den Heijer, M. (2017). Oestrogen and anti-androgen therapy for transgender women. The Lancet Diabetes & Endocrinology, 5(4), 291-300.

10. Ellis, J. A., Sinclair, R., & Harrap, S. B. (2002). Androgenetic alopecia: pathogenesis and potential for therapy. Expert Reviews in Molecular Medicine, 4(22), 1-11.

11. Rebora, A. (2004). Pathogenesis of androgenetic alopecia. Journal of the American Academy of Dermatology, 50(5), 777-779.

12. Sawaya, M. E., & Price, V. H. (1997). Different levels of 5α-reductase type I and II, aromatase, and androgen receptor in hair follicles of women and men with androgenetic alopecia. Journal of Investigative Dermatology, 109(3), 296-300.

13. Morgentaler, A., Zitzmann, M., Traish, A. M., Fox, A. W., Jones, T. H., Maggi, M., ... & Dobs, A. S. (2016). Fundamental concepts regarding testosterone deficiency and treatment: international expert consensus resolutions. Mayo Clinic Proceedings, 91(7), 881-896.

14. Glintborg, D., Andersen, M., Hagen, C., & Hermann, A. P. (2012). Association of pioglitazone treatment with decreased bone mineral density in obese premenopausal patients with polycystic ovary syndrome: a randomized, placebo-controlled trial. Journal of Clinical Endocrinology & Metabolism, 97(5), 1650-1658.

15. Arias-Santiago, S., Gutiérrez-Salmerón, M. T., Castellote-Caballero, L., Buendía-Eisman, A., & Naranjo-Sintes, R. (2010). Androgenetic alopecia and cardiovascular risk factors in men and women: a comparative study. Journal of the American Academy of Dermatology, 63(3), 420-429.

16. Drake, L., Hordinsky, M., Fiedler, V., Swinehart, J., Unger, W. P., Cotterill, P. C., ... & Dallob, A. (1999). The effects of finasteride on scalp skin and serum androgen levels in men with androgenetic alopecia. Journal of the American Academy of Dermatology, 41(4), 550-554.

17. Olsen, E. A., Hordinsky, M., Whiting, D., Stough, D., Hobbs, S., Ellis, M. L., ... & Lilly, F. R. W. (2006). The importance of dual 5α-reductase inhibition in the treatment of male pattern hair loss: results of a randomized placebo-controlled study of dutasteride versus finasteride. Journal of the American Academy of Dermatology, 55(6), 1014-1023.

18. Avram, M. R., & Rogers, N. (2009). Contemporary hair transplantation. Dermatologic Surgery, 35(11), 1705-1719.

19. Glaser, R., & Dimitrakakis, C. (2013). Improvement in scalp hair growth in androgen-deficient women treated with testosterone: a questionnaire study. British Journal of Dermatology, 168(2), 370-377.

20. Gupta, A. K., & Foley, K. A. (2017). 5% Minoxidil: treatment for female pattern hair loss. Skin Therapy Letter, 22(6), 5-7.