Skip to content
🇬🇧 Dispatched from the UK
Vials assayed to > 99% HPLC purity
15% off your first order HELLO15
Hello Peptides
Stacks 2 min read

Glow vs klow: what is the difference?

Glow and klow are the two best-known peptide blends, and they are nearly identical. Klow is glow with one peptide added.

HP Written by the Hello Peptides lab team · Updated October 2026

What is the glow peptide blend?

Glow is a blend of three research peptides: GHK-Cu, BPC-157 and TB-500. It is sold under several names, including glow peptide, glow blend and glow stack, which all refer to the same three-peptide combination. Our glow stack totals 70mg.

What is the klow peptide blend?

Klow holds the same three peptides plus a fourth, KPV. It is also sold as klow blend or klow stack. Our klow stack totals 80mg.

Side by side

PeptideGlow stackKlow stack
GHK-Cu50mg50mg
BPC-15710mg10mg
TB-50010mg10mg
KPVNone10mg
Total70mg80mg

What KPV is

KPV is a tripeptide: lysine, proline and valine. It is the last three amino acids of alpha-melanocyte-stimulating hormone, a natural peptide hormone. In research it is used in cell-based models of inflammatory signalling.

PropertyValue
TypeTripeptide (3 amino acids)
SequenceLys-Pro-Val
Molecular weightAbout 342 g/mol
OriginPositions 11 to 13 of alpha-melanocyte-stimulating hormone

KPV is the smallest component of the klow blend by mass as well as by size. At 10mg it makes up an eighth of the 80mg total.

What is KPV? covers the compound in full.

Which to choose

Because the first three peptides are present at the same amounts in both, the pair works as a controlled comparison. Running the same model with glow and with klow isolates what the fourth compound changes. If KPV is not part of the question being asked, glow is the simpler system.

We make no claim that the peptides in either blend have a combined effect. They are grouped as a research convenience.

Both are supplied pre-mixed and batch-verified: the glow stack and the klow stack. For the individual compounds, see GHK-Cu, BPC-157 and TB-500.

Common questions

Is klow stronger than glow? No. The three shared peptides are present at the same amounts in both. Klow totals 10mg more because it holds a fourth compound, not more of the first three.

Are glow and klow the same as a glow pen? Glow pen is a name for the glow blend supplied in pen format. Ours are both supplied that way: see peptide pens and vials.

Can KPV be bought on its own? Not from us. We supply it only as part of the klow stack.

Research use onlyProducts are supplied for laboratory research and are not for human or animal consumption, diagnosis or treatment. Questions about a batch? Contact the lab with the batch number.
Keep reading All guides →
Formats Peptide pens and vials What a pre-mixed peptide pen is, how it differs from a vial, and which format each product comes in. 3 min read Compounds What is GHK-Cu? A three-amino-acid peptide bound to copper, found naturally in plasma: what it is and why researchers use it. 3 min read Stacks BPC-157 and TB-500: the “wolverine stack” explained What the wolverine stack is, why BPC-157 and TB-500 are studied together, and how to buy the pair in the UK. 3 min read
Chat on WhatsApp