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In this episode, I explain the biology of hair, hair growth, why hair growth slows and what causes hair to stop growing and/or \u201cfall out.\u201d I discuss the essential role of hair stem cells and other supporting biological factors for healthy hair growth. Then I describe various approaches (mechanical and chemical) to slow hair loss by increasing blood flow to hair stem cells, including minoxidil, tadalafil, PRP, microneedling, Botox and ketoconazole treatments. I also discuss how age-related hormone changes cause hair loss and explain the effectiveness of treatments such as caffeine, saw palmetto, growth hormone, finasteride and dutasteride. For all hair growth options, I describe potential side effects, how soon to expect results and the amount of hair regrowth to expect and I highlight effective combination treatments for hair regrowth even in hair \u201cdead\u201d (bald) zones. For many listeners, thinning, brittle hair, or pattern baldness are a source of anxiety and stress. This episode explains the mechanisms underlying hair regrowth tools and the science behind them so that you can evaluate potential treatments and associated side-effect profiles and select the best one(s) for you.\nFor the full show notes, visit hubermanlab.com.\nThank you to our sponsors\nAG1 (Athletic Greens): https://athleticgreens.com/huberman\nLMNT: https://drinklmnt.com/huberman\nWaking Up: https://www.wakingup.com/huberman\nMomentous: https://www.livemomentous.com/huberman\nTimestamps\n(00:00:00) Hair\n(00:04:29) Sponsors: LMNT & Waking Up\n(00:08:04) Psychological States & Hair\n(00:13:19) Hair Anatomy & Stem Cells\n(00:26:05) 3 Phases of Hair Growth\n(00:32:06) Sponsor: AG1 (Athletic Greens)\n(00:36:55) Minoxidil & Blood Flow\n(00:45:37) Increase Blood Flow: Massage, Tadalafil, Platelet-Rich Plasma (PRP), Microneedling\n(00:56:10) Microneedling, Minoxidil & \u201cDead Zones\u201d\n(01:01:25) Botox Treatments\n(01:06:27) Androgens, Hair Growth & Pattern Hair Loss; Scalp vs. Beard Hair\n(01:15:46) Topical Caffeine & Slowing Hair Loss\n(01:21:06) IGF-1: Growth Hormone & Sermorelin; Insulin Sensitivity: Myo-Inositol\n(01:25:52) Iron & Hair Growth\n(01:27:04) 5-Alpha Reductase & Saw Palmetto; Curcumin\n(01:33:22) Ketoconazole & Offsetting Hair Loss\n(01:38:46) Topical & Oral Finasteride\n(01:51:00) Post- Finasteride Syndrome\n(01:56:01) Dutasteride\n(01:58:53) Mechanical & Chemical Stimulation for Hair Growth\n(02:02:46) Zero-Cost Support, YouTube Feedback, Spotify & Apple Reviews, Sponsors, Momentous, Social Media, Neural Network Newsletter\nTitle Card Photo Credit: Mike Blabac\nDisclaimer