Content Encyclopedia

Aging can affect the hair-follicle stem-cell niche and Collagen XVII biology. This guide explains the COL17A1 mechanism, menopause-related hair changes and the scientific limits of cosmetic scalp care using current...

Hair follicles have peripheral circadian-clock activity, but current evidence does not show that human follicles are simply “more active at night” or that topical care works better at night. This...

Niacinamide (Vitamin B3) has been studied for barrier lipids, moisture loss and sebum-related skin parameters. Learn its evidence-based role in scalp care and the limits of hair-growth claims.

Panthenol (Pro-Vitamin B5) has evidence for penetration and tensile-strength support in the hair fiber, while human skin studies support its moisture- and barrier-care profile. Learn its evidence-based role in Mirissa...

Acetyl Tetrapeptide-3 is a synthetic tetrapeptide used in scalp-care formulas. This guide separates its preclinical ECM evidence from Capixyl combination data, explains its distinction from collagen XVII, and places its...

Zinc PCA is a zinc-PCA ingredient used in sebum-balance focused cosmetic care for oil-prone scalps. Evidence varies across zinc compounds and formulations; Zinc PCA should not be positioned as a...

Biotinoyl Tripeptide-1 in scalp care, the difference between Procapil and Capixyl, the limits of current evidence, and its role in the Mirissa Lab serum formula.