Klow vs Glow: what is actually in each blend

If you've spent any time around peptide content this year, you've probably seen "Klow" pop up next to "Glow", often in the same post, rarely with an explanation. So here's the short version first: Klow is Glow with one more peptide added. Same three compounds, plus 10 mg of KPV.

That's the answer. The rest of this page is for anyone who wants to know what those four compounds actually are, why the milligram numbers on the label are a bit misleading, and what a proper test report for each blend should look like.

Side by side

The Klow column is how three UK sellers list it on their own product pages; all three agree on 50 / 10 / 10 / 10 mg. The Glow column is our own Glow: two pre-filled pens, each holding 25 mg GHK-Cu, 5 mg BPC-157 and 5 mg TB-500, which is where the 70 mg comes from.

One thing worth knowing: neither "Glow" nor "Klow" is a scientific name. You won't find either in the papers cited at the bottom of this page. The literature studies each peptide on its own, and the blend names are labels sellers put on a mixture. That's fine, but it means the name tells you nothing on its own. The label and the report do.

Meet the four

GHK-Cu is the big one, 50 of the 70 or 80 mg. It's a tiny tripeptide (glycine, histidine, lysine) holding a copper ion. The peptide on its own is about 340 Da and the copper complex about 403 Da. It was first isolated from human plasma in 1973, and it's the same molecule that turns up in cosmetic ingredient lists as copper tripeptide-1. The full GHK-Cu story is here.

BPC-157 is fifteen amino acids long, about 1,419 Da, with a sequence taken from a protein found in gastric juice. TB-500 is a short fragment related to thymosin beta-4, about 889 Da. They're unrelated molecules that get sold together so often people assume they're two versions of one thing. BPC-157 vs TB-500 explains the difference.

KPV is the one Klow adds. It's another tripeptide, lysine, proline and valine, and it's the last three amino acids of a much longer hormone called alpha-MSH. Researchers describe it as "the C-terminal tripeptide" of alpha-MSH, which just means the tail end. At 342 Da it's one of the smallest compounds on the market. KPV, explained.

Why the milligrams are misleading

Here's the bit the posts skip. A milligram is a weight, not a count. Small molecules weigh less each, so the same number of milligrams holds more of them.

Divide each amount by the molecule's mass and you get a count of molecules (chemists use micromoles for this):

So the label says KPV, TB-500 and BPC-157 are equal partners at 10 mg each. By molecule count they're nowhere near equal: there are roughly four KPV molecules for every BPC-157 molecule, and GHK-Cu outnumbers BPC-157 by about eighteen to one. None of that is a problem. It's just what a mixture by weight looks like, and it's worth knowing before you read anything into a "10 mg each" label.

What a proper report looks like for each

A blend can't have a purity percentage. Purity is one peak divided by the total, and a blend has three or four intended peaks, so the ratio means nothing. Why a blend report has no purity percentage goes through it properly. What a blend report gives you instead is identity and measured content for each peptide.

Our current Glow batch, for example, reads GHK-Cu 21.84 mg/ml, TB-500 3.38 mg/ml and BPC-157 3.86 mg/ml, with the batch number and a verification key on the testing page. A Klow report should read the same way with a fourth line for KPV.

If you're comparing listings for either blend, five quick checks:

1. Every peptide on the label has its own milligram figure. "80 mg blend" with no breakdown is not a label.
2. The report names every peptide on the label. Four on the label, four on the report.
3. There's no single purity percentage for the blend. If there is one, ask what it was measured on.
4. The batch on the report matches the batch on the carton. Batch traceability explains why that matters.
5. You can verify the report yourself with the lab's key, not just look at a PDF.

Where Biovanta fits

We supply Glow, the three-peptide set, and KPV as a single compound. We don't sell a four-peptide blend. Everything is supplied strictly for in-vitro laboratory research, with an independent report per batch.