Podbit · Huberman Lab
Topical caffeine and ketoconazole weakly block androgens at the scalp without systemic absorption. Topical finasteride still lowers systemic DHT by about 30%. But topical dutasteride, with its rapid local half-life, doesn't affect systemic DHT at all — making it the cleanest option for protecting hair without hormonal side effects.
Where this was said
At 39:02 · chapter starts 38:10
The final content segment addresses the most common male vanity concern: hair loss. Huberman asks whether systemic DHT blockers like Propecia cause the libido and motivation side effects their reputation suggests. Gillett pivots to topical alternatives. Topical caffeine can weakly crowd out androgens at the scalp follicle — effective enough to be clinically significant but mild enough to need combination with ketoconazole, another weak topical anti-androgen. A critical warning: topical spironolactone should not be used by males because its molecular size means it absorbs systemically. Topical finasteride also has systemic absorption, lowering systemic DHT by about 30% — meaningful but moderate. The standout option is topical dutasteride: its rapid half-life at lower topical doses means it acts locally without reaching systemic circulation at all, protecting hair without measurably affecting systemic DHT. Gillett notes he has seen this confirmed anecdotally in many patients on topical dutasteride therapy.
Topical finasteride is partially absorbed systemically and typically reduces systemic DHT by about 30%, offering a middle ground between full systemic suppression and no effect.
Unlike topical finasteride, topical dutasteride does not affect systemic DHT at all, making it preferable for men who want hair protection without hormonal side effects.
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