GHK-Cu DIY serums: what the science says vs. TikTok

What did @biohackbeautylab actually say?

The creator walked viewers through making a self-described "1% concentration" GHK-Cu topical serum, mixing 150mg of GHK-Cu powder into roughly 15mL of liquid (2mL sterile water plus 13mL hyaluronic acid serum). She warned against pairing it with vitamin C or strong acids, saying those ingredients "will contradict the copper." She also claimed the serum gives her a "tight glowing effect immediately" and preferred crystallized GHK-Cu over raw powder for perceived absorption reasons.

She did not cite any studies, consult any formulation literature, or acknowledge any safety considerations beyond the ingredient conflict warning. The framing was entirely personal experience and aesthetic preference.

Does the science back this up?

GHK-Cu does have legitimate research behind it, but the DIY math here is off, and several of the formulation claims are either unproven or just wrong.

GHK-Cu (glycyl-L-histidyl-L-lysine copper) has been studied since the 1970s. Pickart et al. published work in the Journal of Biological Chemistry (1973) establishing its presence in human plasma and tissue remodeling activity. More recent work by Pickart and Margolina (2018, Oxidative Medicine and Cellular Longevity) reviewed evidence for GHK-Cu stimulating collagen and glycosaminoglycan synthesis in vitro. Those findings are real. The problem is that in vitro results and anecdotal DIY serum experiences are separated by a very large gap.

On concentration: if you dissolve 150mg in 15mL total, you get a 1% w/v solution. That math checks out on paper. But GHK-Cu is typically used in cosmetic formulations at 0.1% to 2%, so 1% is within the conventional range, per the published formulation literature.

On absorption: the claim that crystallized GHK-Cu absorbs differently than powder form has no published support. Once dissolved in solution, molecular identity is the same regardless of starting crystal structure.

What did they get wrong (or right)?

Credit where it is due: the sterile water, sterilized glass, and pre-dissolving before combining with serum are reasonable formulation hygiene practices. Pre-dissolving peptides before adding them to a finished base is standard in compounding logic, and she got that right.

The acid conflict warning is partially correct but oversimplified. Copper peptides can be destabilized by very low pH environments, and vitamin C (ascorbic acid) can reduce copper ions, which may degrade the GHK-Cu complex. That concern has some chemical basis. However, not every acid is a problem at every concentration. Blanket avoidance of "strong acids" is vague enough to mislead.

The crystallized versus raw powder absorption claim is simply not supported. She states she prefers crystallized because of "how I feel like it absorbs," which is subjective and not a meaningful formulation distinction once the compound is in solution.

There is also no mention of pH adjustment, preservatives, or shelf-life considerations, all of which matter in a water-based serum you are applying to your face. Unpreserved water-based formulations can grow bacteria within days depending on storage conditions.

What should you actually know?

DIY peptide serums carry real risks that this video glosses over entirely. The absence of preservatives in a water-based formula is the most immediate concern. A 2019 review in the International Journal of Cosmetic Science (Geis) noted that unpreserved aqueous cosmetics are a documented source of microbial contamination, including Pseudomonas aeruginosa, which is particularly dangerous around the eyes.

GHK-Cu sourced from unregulated suppliers also has no guaranteed purity or identity. Peptide powders sold for "topical use" on Amazon or similar platforms are not subject to pharmaceutical-grade quality control. You do not actually know what concentration you are getting or whether it is free of contaminants.

That said, GHK-Cu as an ingredient is used in legitimate commercial skincare products, and the research on its wound-healing and anti-inflammatory properties in cell studies is not nothing. Dou et al. (2020, Biomedicines) reviewed its role in skin repair signaling. The science exists. The gap is between controlled research and a glass bottle mixed on a kitchen counter.

If you are interested in peptide skincare, commercially formulated products with preserved, pH-adjusted bases and verified concentrations are meaningfully safer than home compounding from raw powders.