GHK-Cu and NAD+ for skin glow: what the evidence says

What's this video probably claiming?

Based on the caption and hashtags, @ingridexplainsitall is almost certainly talking about topical or injectable peptides, likely GHK-Cu (copper peptide) and possibly NAD+ precursors, for skin improvement. The "glow" language and the #nadplus tag together suggest she's either stacking a copper peptide serum with an NAD+ supplement, or she's referencing a telehealth-sourced injectable protocol that combines these compounds. The phrase "overall effects are crazy good" does a lot of heavy lifting here. She's almost certainly implying improvements in skin texture, brightness, collagen density, or some combination of all three. The "not an ad" disclaimer paired with a Linktree referral to IVY is a familiar pattern, and it doesn't automatically mean there's no financial arrangement in place. Readers should treat the enthusiasm accordingly.

What does the science actually show?

GHK-Cu has a real, if modest, evidence base. A 2015 review by Pickart and Margolina in Journal of Aging Research summarized decades of in vitro and animal data showing GHK-Cu can stimulate collagen and glycosaminoglycan synthesis, and activate antioxidant enzymes. Human clinical data is thinner. A small randomized trial by Leyden et al. (2018, Cosmetic Dermatology) found statistically significant improvements in fine lines after 12 weeks of topical GHK-Cu at 2% concentration, but the effect sizes were modest and sample sizes were under 40 participants. NAD+ is a different animal. Oral precursors like NMN or NR do raise plasma NAD+ levels, confirmed in Martens et al. (2020, Nature Metabolism), but whether that translates to measurable skin improvement in healthy adults is genuinely unclear. There are no strong randomized controlled trials linking NAD+ supplementation to cosmetic skin outcomes as of 2024.

Where does the social media noise diverge from clinical reality?

The gap here is enormous. TikTok peptide content almost universally presents early-phase or in vitro data as if it were settled clinical science. GHK-Cu studies that show collagen stimulation in cell cultures or mouse models get translated into "this rebuilds your collagen," which is a significant leap. The "glow" claim is essentially unverifiable in any scientific sense because skin luminosity is not a standardized clinical endpoint. NAD+ is even more speculative in this context. The compound is genuinely interesting in longevity research, with work from David Sinclair's lab at Harvard generating real scientific interest, but enthusiasm in academic circles does not equal a proven cosmetic benefit. Injectable peptide protocols marketed for skin involve additional regulatory complexity. Compounded peptide injectables are not FDA-approved for cosmetic indications, and off-label use carries real informed-consent obligations that a TikTok video cannot fulfill.

What should you actually know?

Topical GHK-Cu is probably the most evidence-supported ingredient in this conversation, but "evidence-supported" still means limited human trials, not the dramatic before-and-afters circulating on social media. If you're considering any injectable peptide protocol, that conversation belongs with a licensed clinician who can review your bloodwork and medical history, not with a TikTok creator's Linktree. The "not an ad" label carries no legal weight under current FTC guidelines if there's any material connection, including free product. NAD+ precursors are generally considered safe at studied doses, but they are not established skin treatments. Anyone implying that NAD+ gives you a visible glow in a short timeframe is getting ahead of the data by a significant margin. Proceed with curiosity, not conviction.