- Is melatonin better as a supplement or applied to the scalp? No study has compared oral and topical melatonin head to head. Topical melatonin has one small placebo-controlled pilot trial in 40 women plus a set of mostly uncontrolled studies of a cosmetic solution; oral melatonin has no published hair-loss trial at all.
An essential vasodilator with some anti-androgenic effects
a topical anti-androgen with less systemic involvement
natural substance from Neem tree with medicinal and pesticidal properties
signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss
- Is metformin used topically for hair loss, or only as an oral tablet? Approved metformin products are oral tablets only; there is no approved topical metformin for hair loss. Published human reports of topical use are a handful of uncontrolled, pharmacy-compounded case reports in scarring alopecia, and the most-cited clinical series actually used the oral drug.