Hair Thickening Serum with Biotin, Argan & Pea Peptides (3-Pack 1oz each)

Hair Thickening Serum - 3 Pack is a peptide-forward scalp treatment positioned as a clinically-proven density builder. The formula combines biotin, argan oil, and pea peptides—actives with modest but growing trichology interest—aimed at fine, thinning, or damaged hair. Applied via dropper, it claims non-greasy delivery; the 3-pack (3 fl oz total) is US-manufactured and marketed as dermatologist-tested.

Growth claims rest largely on anecdote and ingredient reputation rather than published clinical data. Pea peptides and biotin show promise in vitro, but evidence for visible thickening at consumer doses remains mixed. The serum sits at the premium end (~$35/oz), competing with The Ordinary Multi-Peptide Serum (~$5–8/oz) and Vegamour GRO (~$68/oz). Reviews confirm it's lightweight and non-greasy, but long-term density gains are inconsistently reported. No major QC complaints, though some note the dropper requires careful handling.