Why "1% copper peptide" usually is not 1%

Pick up two copper peptide serums that both say 1% on the front. There is a decent chance one contains ten times more GHK-Cu than the other, and the label will not help you work out which.

The trick is the word complex.

One percent of what

GHK-Cu is a specific molecule: glycine, histidine, lysine, bound to copper. When a label says one percent GHK-Cu, that should mean one percent of the finished product is that peptide. In a 30ml bottle, that is 300mg.

When a label says one percent copper peptide complex, it is measuring something else. A complex is a blend, and the peptide is one component of it. One percent of a blend that is mostly carrier tells you almost nothing about how much active you are getting. The number on the front is accurate and useless at the same time.

Neither phrasing is illegal. Both are common. Only one of them answers the question you are actually asking.

Why brands do it

Raw GHK-Cu is expensive. On a recent breakdown from a dermatologist, cosmetic grade copper peptide runs somewhere around ten to fifteen thousand dollars per kilogram, depending on grade and supplier.

At that price the difference between a real one percent and a nominal one is a serious line on a cost sheet. A brand that wants the credibility of a strength claim without the cost of the ingredient has an obvious route: state a percentage, be vague about what it applies to, and let the customer assume the flattering reading.

How to check

You do not need a lab. You need two numbers.

Ask what the milligram content is, and ask what the bottle size is. If a brand will tell you both, you can work out the concentration yourself and compare products honestly. If a brand will only give you a percentage and will not say a percentage of what, you have learned something.

For what it is worth, ours is 300mg of GHK-Cu in a 30ml bottle. That is where the one percent comes from, and it is why we print the milligrams rather than only the percentage. A number you can check is worth more than a number you have to trust.