Reading a Selank + Semax Blend Certificate (KX20)

A blend label gives one number. The report gives several, and they will not add up the way you expect. KX20 is a clean example of why a blend certificate has to be read component by component, and why a single “purity” figure for a blend would be close to meaningless even if someone printed one.

A real lot

Our current KX20 lot is Janoshik report #214665, lot KX-260727, analysed 6 August 2026:

• Selank: 11.51 mg / 11.87 mg / 11.78 mg
• Semax: 12.13 mg / 12.34 mg / 12.43 mg
• No purity figure is reported for this lot.

Two peptides, three vials each. The label says 20 mg; the measured total per vial is roughly 23.6 to 24.2 mg.

The label number is a sum, and this one is over

For a blend, the figure on the label is the combined mass of the components, not the amount of each. So the first thing to do with a blend report is add the components for one vial and compare that total to the label:

• Vial 1: 11.51 + 12.13 = 23.64 mg
• Vial 2: 11.87 + 12.34 = 24.21 mg
• Vial 3: 11.78 + 12.43 = 24.21 mg

Against a 20 mg label that is 118–121%. Comfortably over, which is the safe direction, but a bigger overfill than most single-compound lots and worth knowing about rather than assuming 10 mg of each.

The ratio is the thing a blend report is for

A name like “Selank + Semax 20mg” implies nothing about the split. Here it is roughly 49:51 by mass — close to even, but that is a fact read off this lot’s report, not something the product name guarantees. On a different lot it could differ, and the only way to know is to read that lot’s report.

This is the practical reason to care: any calculation you make per component has to start from the per-component figure. Dividing the label by two would be wrong twice over — wrong on the total, and wrong on the split.

Why there is no single purity number

Chromatographic purity is the proportion of detected material eluting as one peak. A blend has two intended peaks by design, so “purity” for the mixture is not a defined quantity. A meaningful purity statement for a blend has to be per component — each peptide’s purity measured before or alongside blending — and that is a different and more expensive analysis than quantifying how much of each is present.

So a blend listing advertising a single “99%+ purity” badge is making a claim that does not correspond to any standard measurement. Either per-component purity figures exist on the report, or the claim has nothing behind it. How blends are tested covers the methods; which claims mean something covers the badges.

What this lot does not say

• No purity, per component or otherwise. We leave the field blank on the product page rather than carry a figure over from somewhere else.
• No endotoxin — no separate analysis was run on this lot.
• No net peptide content, so the measured milligrams include counter-ion and residual water. See net peptide content.

Checks for any blend certificate

• Each component is named and quantified separately. One combined number is not a blend report.
• The components sum to something sensible against the label — add them yourself.
• Three vials, so the ratio can be seen to hold across the fill.
• The lot number matches the vial: KX-260727 here.
• Any purity claim is per component, with a figure.

The arithmetic is in the COA checker — run each component separately against its own share. The product page is KX20 — Selank + Semax Blend 20mg, and report #214665 is on the lab results page.

All products referenced on this site are supplied for laboratory research use only, and are not for human or veterinary use.