Peptide hair serums: what TikTok gets right and wrong

What's this video probably claiming?

Based on the caption and hashtags, this creator is likely walking through a product recommendation list featuring The Ordinary Multi-Peptide Serum for Hair Density and Kérastase Genesis, framing them as science-backed tools for thinning hair, density loss, and scalp health. The language around "advanced peptide technologies" targeting the hair follicle suggests the video positions these over-the-counter topical products as meaningfully clinical, not just cosmetic. Given the hashtag category ties this content to peptide therapy broadly, including compounds like GHK-Cu, BPC-157, and TB-500, the viewer is likely left with the impression that the peptide mechanisms in a $10 drugstore serum are comparable to prescription-grade peptide interventions. That's a significant leap. The Ordinary's product does contain copper peptides (GHK-Cu) and other signal peptides, but the concentrations, delivery vehicles, and evidence bases are entirely different from injectable or clinically dosed peptide protocols.

What does the science actually show?

GHK-Cu (copper tripeptide-1) is the most studied ingredient in this category. Pickart et al. (2015, Journal of Aging Science) documented its role in stimulating follicle size and prolonging the anagen phase in cell culture models. A small clinical study by Ley and colleagues (2020, Journal of Cosmetic Dermatology) found a statistically modest improvement in hair density with topical GHK-Cu formulations over 12 weeks, but the effect sizes were small and the control conditions weak. Kérastase Genesis contains edelweiss stem cells and aminexil, the latter of which has some peer-reviewed support. Paus et al. (2007, British Journal of Dermatology) showed aminexil may reduce collagen stiffening around the follicle, which theoretically prevents miniaturization. The honest summary: these ingredients have plausible mechanisms and preliminary positive signals, but no large randomized controlled trials show they match the effect size of minoxidil or finasteride for androgenic alopecia. The biology is real. The clinical magnitude at OTC doses is not yet established.

Where does the social media noise diverge from clinical reality?

The problem here isn't that the products are fraudulent. It's the framing. When a creator with 316,000 views uses language like "targets the hair follicle" and pairs it with hashtags pulling from injectable peptide therapy categories, the implied equivalency is misleading even if no explicit lie is told. GHK-Cu in an injectable form at therapeutic concentrations is a different clinical conversation than GHK-Cu in a rinse-off serum at an undisclosed percentage. The Ordinary does not disclose exact GHK-Cu concentration in their Multi-Peptide Serum. Without that number, claims about follicle-level targeting are speculative. Additionally, "density and fullness" as outcomes conflate cosmetic appearance (hair shaft swelling from conditioning agents) with actual follicle-level growth, which requires histological or trichoscopy confirmation. No TikTok product recommendation is delivering that data. The creator's vibe framing, specifically describing these products as "effective," is an efficacy claim that the available literature does not robustly support for these specific formulations.

What should you actually know?

If you have clinically significant hair thinning, topical peptide serums are not a replacement for a proper evaluation. Androgenic alopecia, telogen effluvium, and alopecia areata require different interventions, and none of them are reliably addressed by OTC serums alone. Minoxidil remains the most evidence-supported topical option with decades of RCT data behind it. That said, peptide-containing serums are generally low-risk, and for mild diffuse thinning or as adjuncts to evidence-based treatment, they are unlikely to cause harm. GHK-Cu specifically has a reasonable safety profile. The Ordinary's product is affordable enough that the cost-to-curiosity ratio is low. But anyone experiencing accelerated shedding, patchy loss, or scalp symptoms should see a dermatologist before spending money on any serum stack. A board-certified dermatologist or trichologist can order lab work, assess hormone panels, and rule out treatable systemic causes that a $15 serum will not fix.