Andrew Huberman — Professor of neurobiology and ophthalmology at Stanford School of Medicine and host of the Huberman Lab podcast. This is a solo episode.
The gist
In this solo episode, Huberman explains how each hair has its own stem cell niche cycling through three phases (anagen growth, catagen recession, telogen rest), and how blood flow, oxygen, hormones and mechanical cues regulate them. He shows why dihydrotestosterone (DHT), made from testosterone by 5-alpha reductase, drives androgen-related pattern hair loss in both men and women. He then walks through mechanical treatments (microneedling, scalp massage, PRP, Botox) and chemical treatments (minoxidil, tadalafil, caffeine, saw palmetto, ketoconazole, finasteride, dutasteride, IGF-1/growth hormone peptides), covering dosages, mechanisms and side effects. He concludes that combining a mechanical stimulus (microneedling) with a chemical one (finasteride) is the most effective approach, while urging low starting doses and medical supervision.
Big reveals
- Dispels the myth that you inherit your exact balding pattern from your mother's father; you inherit androgen receptor density, better predicted by your mother's mother.
- Huberman admits he is losing hair in patches up front at age 47 but has never fretted about keeping his hair.
- States the combination of microneedling and minoxidil can recover 'dead zones' of scalp that neither treatment recovers alone.
- Reveals topical caffeine can be as effective as minoxidil for slowing hair loss, without minoxidil's blood pressure and prolactin side effects.
- Recounts personally taking high-dose curcumin/turmeric, feeling 'absolutely terrible,' and confirming via blood work he is sensitive through the DHT pathway.
- Finasteride can reduce hair loss in 90% of people and increase hair count by ~20%, but carries serious sexual and mood side effects.
- Highlights post-finasteride syndrome: younger males stopping finasteride report severe drops in libido, erectile function and mood, even suicidal depression.
- Concludes microneedling plus finasteride is probably the single most effective hair-regrowth combination.
Things worth remembering
- Scalp hairs can keep growing for 4-6 or even 8 years, while eyebrow hairs grow only for months, which is why eyebrows never reach your waist.
- By age 50 about 50% of all men and women experience noticeable hair loss, with up to 85% of them feeling anxiety about it.
- Hair loss is actually ongoing from about age 30 to 50; people only notice it around 50 under bright bathroom lighting.
- Sebum from sebaceous glands waterproofs skin and acts as a strong antibacterial/antimicrobial barrier.
- Minoxidil (Rogaine) was originally a hypertension drug; it grows hair by causing vasodilation and extending the anagen phase.
- Healthy women actually have higher levels of testosterone than estrogen, though far less testosterone than most men.
- DHT binds the androgen receptor at five times the affinity of testosterone, making it the most powerful androgen in humans.
- Ketoconazole (Nizoral) shampoo used 2-4x/week with 3-5 minute contact gives roughly an 80% rate of maintaining hair.
- Dutasteride inhibits all three 5-alpha reductase isoforms and can reduce DHT by ~95%, working 2-5x faster than finasteride.
- Caffeine works by inhibiting PDE to indirectly raise IGF-1 and may also reduce apoptosis of the hair stem cell niche.