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      learn Follistatin

      glycoprotein that inhibits TGF-β and promotes hair growth by antagonizing activin

      learn Azelaic Acid

      • Is azelaic acid safe to use daily long-term? Azelaic acid has a long tolerability record on facial skin in acne and rosacea, where side effects are local and usually mild — but for daily long-term scalp use the only trial is one six-month study in 26 women, in which mild itching was the main adverse effect, so long-term scalp safety is not established.

      learn Microneedling

      technique to create small wounds in skin to activate collagen production and hair growth