GHK-Cu, GLOW and KLOW: what is the difference?

Start with what you are looking for

If your question is about the look or feel of skin, you may encounter a GHK-Cu serum alongside claims for GLOW and KLOW. If your question is recovery, you may see the same blends discussed in a different context. The intended goal is useful to understand; it is not itself evidence that a product achieves it. See the GHK-Cu profile and the route comparison.

For an everyday skin-care question, see what to expect from a copper-peptide serum.

For the proposed role of each ingredient and the evidence behind it, see how GLOW and KLOW are meant to work.1

What is in each name?

GHK-Cu is one peptide bound to copper; a serum contains a complete cosmetic formula, not just that ingredient. One GLOW product example lists GHK-Cu, BPC-157 and TB-500; a separate published description of KLOW adds KPV to those three. Names and amounts are not standardised, so check the exact label: another product can differ. Read the GLOW and KLOW profiles.23

A 2026 Australian TGA advisory reported no detectable TB-500 in tested Synedica KLOW 80 mg and BARBIE KLOW 100 mg products, although their labels listed it; those labels also listed B12. This finding is about those tested products, not every product called KLOW. The TGA advises people with Synedica-branded peptide products to stop using them and seek health advice if concerned; see the KLOW profile for the advisory and disposal context.11

What is each ingredient supposed to contribute?

GHK-Cu is studied in cosmetic and skin-related contexts. BPC-157 is investigated in animal models of tissue injury; TB-500 is a fragment related to a longer protein studied in repair. Research on the longer protein does not establish the fragment’s effects. KPV has been studied in inflammatory pathways in cells and mice. These are rationales for research, not proof that the ingredients work together in people.456

Does KLOW reduce injection-site reactions?

Some people hope the added KPV will make a GLOW-like blend less irritating at the injection site. We found no controlled human comparison establishing that effect; individual accounts are not a reliable measure of effectiveness or safety. A reaction can have different causes. Our practical guide to injection-site reactions explains what to notice and when to seek help.

Painful, hot and swollen skin needs urgent medical advice. If the lips, mouth, tongue or throat suddenly swell, or breathing becomes difficult, call local emergency services immediately; do not wait to decide which ingredient caused the reaction.57910

Does a serum study tell me what an injected blend does?

No. A topical product is formulated for application to skin; injection bypasses that barrier and raises different exposure and product-quality questions. A small study after laser treatment and a small eyebrow study examined specific topical regimens, not these blends or injections. Neither shows that injection works better, or that results transfer between products. For an eyebrow-versus-scalp comparison, see what the hair studies actually tested.18

A useful next question

Check the exact product and its route, then ask what outcome was measured in people using that same formulation. Certificates and testimonials cannot establish that a mixture works. For a skin serum, read the product’s directions; for questions about a particular product or a reaction, a pharmacist or clinician can help. Continue with how to assess claims for a peptide stack or product identity and storage claims.6