DIY peptide face serums: What TikTok gets wrong about GHK-Cu

What did @vg48beautypeps actually say?

The creator mixed GHK-Cu powder into The Ordinary's hyaluronic acid serum to make a DIY topical peptide product, planning to apply it to both the face and abdomen. They noted the powder is "for topical only," wiped surfaces with isopropyl alcohol wipes before mixing, and stored the finished serum in the fridge. They did not claim to treat any disease, named no dose, and included a disclaimer that this is not medical advice.

To be fair, this is a relatively restrained DIY peptide video. There are no cure claims, no injection prep, no wild health promises. The creator is mixing a known cosmetic peptide into an existing cosmetic carrier. That matters when evaluating how much risk is actually present here.

Does the science back this up?

GHK-Cu (copper peptide GHK) does have real research behind it, more than most DIY beauty ingredients. But the evidence is mostly in vitro or animal-based, and the leap to "mix your own batch at home" is where things get complicated.

GHK-Cu is a naturally occurring tripeptide found in human plasma. Published research by Pickart and Margolina (2018, Biomedicines) documents its effects on skin remodeling, collagen synthesis, and antioxidant activity in cell and animal models. A 2015 study by Finkley et al. in the Journal of Wound Care found topical copper peptide formulations accelerated wound healing in clinical settings. However, those were pharmaceutical-grade, stability-tested formulations, not raw powder stirred into off-the-shelf hyaluronic acid.

Stability is the real issue. GHK-Cu degrades without proper pH control, preservatives, and sterile conditions. The concentration in a home mix is completely unknown, which makes any effect, positive or negative, genuinely unpredictable.

What did they get wrong (or right)?

Credit where it is due: wiping surfaces with isopropyl alcohol before mixing is better practice than nothing, and refrigerating the finished product slows microbial growth and peptide degradation. Using a hyaluronic acid base is a reasonable carrier choice since HA is water-based and GHK-Cu is water-soluble.

What they got wrong, or at least incomplete, is the assumption that raw powder plus a commercial serum equals a functional, safe product. Without knowing the pH of The Ordinary's hyaluronic acid (typically around 6.0), the concentration of GHK-Cu per milliliter, or whether the preservative system in the base can handle an added peptide, you genuinely do not know what you are applying to your skin.

Applying an unknown-concentration copper peptide to the abdomen, where skin barrier function differs from the face, adds another variable nobody in this video addresses. The "it looks pretty" observation is not a stability test.

What should you actually know?

GHK-Cu is not dangerous in the way that, say, DIY retinol acid peels are. It is not a prescription ingredient, it does not require injection, and it has a reasonable cosmetic safety profile at appropriate concentrations (typically 0.1 to 2 percent in commercial formulations). But "not dangerous" is not the same as "doing what you think it is doing."

The real risks here are microbial contamination from unsterile mixing conditions, unknown peptide concentration leading to either zero effect or skin irritation, and peptide degradation if the pH of the carrier is not optimized. A 2019 review by Gorouhi and Maibach in Skin Pharmacology and Physiology noted that peptide stability in topical formulations is highly sensitive to pH, temperature, and oxidative conditions.

If you want GHK-Cu on your skin, established cosmetic brands already sell stable, tested formulations at known concentrations. The DIY version introduces variables that undermine the very outcome you are going for.