HRT and hair loss in perimenopause: separating TikTok hope from clinical evidence

What did @skincare.tiffany actually say?

Sydney, a 46-year-old esthetician in perimenopause, says she tried a testosterone pellet as part of HRT and within weeks noticed significant hair loss and breakage she hadn't seen before. She connects this to elevated testosterone converting to DHT, which she says "brings the hair follicle" (she likely meant shrinks). To counter it, she used a caffeine-and-melatonin hair serum, pumpkin seed oil supplements, a hair mask routine, and dietary changes including omega fatty acids, eggs, and Greek yogurt. She also ditched heat and color treatments for three months. She's now switched providers, dropped the pellet, and started a testosterone cream instead, hoping her body "converts the cream better than the pellets which are wax base." Her current hair, she says, has its shine and vibrancy back. The core claim: testosterone pellets drove her hair loss via DHT conversion, and a combination of topical products, supplements, and lifestyle changes helped her recover.

Does the science back this up?

The DHT-hair loss connection is real and well-documented. The supplements and topical ingredients she mentions have some evidence behind them, though the quality varies considerably.

DHT (dihydrotestosterone) is produced when testosterone is converted by the enzyme 5-alpha reductase. In genetically susceptible individuals, DHT binds to receptors in hair follicles and causes miniaturization over time. This is the established mechanism behind androgenetic alopecia (Blumeyer et al., 2011, Journal of the German Society of Dermatology). When exogenous testosterone, especially at higher doses from pellets, spikes serum testosterone levels, DHT can follow. This is a recognized side effect in both male and female hormone therapy patients.

Pumpkin seed oil has been studied as a 5-alpha reductase inhibitor. A randomized controlled trial by Cho et al. (2014, Evidence-Based Complementary and Alternative Medicine) found a 40% increase in hair count in men with androgenetic alopecia taking pumpkin seed oil capsules versus placebo. The evidence in women is much thinner. Caffeine applied topically has shown some ability to stimulate hair follicle elongation in lab studies (Fischer et al., 2007, International Journal of Dermatology), though clinical evidence remains limited. Melatonin applied topically has a small body of evidence suggesting it may influence the hair growth cycle (Fischer et al., 2004, British Journal of Dermatology). None of these are FDA-approved hair loss treatments.

What did they get wrong (or right)?

She got the core mechanism right. DHT is genuinely implicated in hormone-related hair shedding, and the idea that a testosterone pellet could push levels high enough to spike DHT conversion is clinically plausible. Her instinct to "start low and slow" with hormones and to establish estrogen and progesterone first before adding testosterone is actually reasonable clinical advice that many practitioners share.

Where she stumbles: the claim that a caffeine-melatonin serum "helps with the conversion of that DHT and blocking that from the hair follicle" is overstated for a topical OTC product. These ingredients are not 5-alpha reductase inhibitors in any meaningful clinical sense. She also attributes estrogen decline to reduced sebum production in a fairly simplified way, though the link between estrogen and skin sebaceous gland activity does have some basis (Thornton, 2002, Journal of Investigative Dermatology).

Her claim that the cream is better than the pellet because of how her body "converts" it is unverifiable and not how absorption pharmacology works in any standardized way. Pellets and creams differ in delivery, not in whether the body can process testosterone itself.

What should you actually know?

Hair loss during perimenopause is genuinely common and under-discussed. The hormonal shifts, not just testosterone, play a role. Estrogen decline matters too, as estrogen has a protective effect on hair follicles and can prolong the growth phase of the hair cycle (Thornton, 2002).

If you are considering testosterone as part of HRT and have a personal or family history of androgenetic alopecia, this is worth discussing explicitly with your prescriber before starting. Pellets, in particular, release hormones in a non-adjustable way, which is a legitimate clinical limitation. If levels spike too high, you cannot simply reduce the dose mid-pellet cycle.

• Topical minoxidil remains the only FDA-approved topical treatment for female hair loss and has a far stronger evidence base than any of the products mentioned here.
• Pumpkin seed oil and caffeine serums are low-risk additions, but should not replace a conversation with a dermatologist or endocrinologist about the root cause.
• Dietary changes like increasing omega-3s, protein, and zinc may support overall hair health but are unlikely to reverse DHT-driven follicle miniaturization on their own.
• If you are experiencing significant hair loss on HRT, ask your provider for a full hormonal panel, including free and total testosterone, DHEA-S, thyroid, ferritin, and SHBG, before attributing it to a single cause.