GLOW vs KLOW
The difference is one peptide: KLOW is GLOW plus KPV. GLOW usually holds GHK-Cu, BPC-157 and TB-500 in a 70 mg vial; KLOW adds 10 mg of KPV in an 80 mg vial. Neither blend has been studied as a combination, and no component is an FDA-approved drug.[1,2]
5 sources, every number linked. PepDose sells no peptides and takes no vendor money.
At a glance
How do GLOW and KLOW compare?
Neither blend has been tested in any study. The evidence is for the separate ingredients, and it is mostly animal and lab work.
| GLOW | KLOW | |
|---|---|---|
| What is in it | GLOWGHK-Cu, BPC-157 and TB-500 | KLOWGHK-Cu, BPC-157, TB-500 and KPV |
| Typical vial | GLOW70 mg: 50 mg GHK-Cu + 10 mg BPC-157 + 10 mg TB-500 | KLOW80 mg: 50 mg GHK-Cu + 10 mg BPC-157 + 10 mg TB-500 + 10 mg KPV |
| The extra peptide[1] | GLOWNone | KLOWKPV: a three-amino-acid fragment of alpha-MSH that reduced gut inflammation in mouse models |
| Studies of the blend itself | GLOW0 | KLOW0 |
| Evidence level | GLOWAnimal and lab data | KLOWAnimal and lab data |
| FDA status[2] | GLOWNot approved; none of its parts is an approved drug | KLOWNot approved; none of its parts is an approved drug |
| With 2 mL of water, 10 units holds about | GLOW2.5 mg GHK-Cu, 0.5 mg BPC-157, 0.5 mg TB-500 | KLOW2.5 mg GHK-Cu and 0.5 mg each of BPC-157, TB-500 and KPV |
What is the difference between GLOW and KLOW?
One ingredient. GLOW is a supplier name for GHK-Cu combined with BPC-157 and TB-500. KLOW is the same three plus KPV, a three-amino-acid fragment of alpha-MSH. A typical GLOW vial totals 70 mg and a typical KLOW vial 80 mg, though the split between peptides is not standardised.[1]
What does KPV add?
KPV is studied for inflammation. In human gut cells and mouse models of colitis, it reduced inflammatory signalling and colitis severity when given by mouth. It has not been tested in human trials, and the FDA identified no human exposure data for it.[1,2]
Has either blend been studied?
No. No study has tested GLOW or KLOW as a combination. The ingredients have their own research, mostly in animals and cells: GHK-Cu for collagen and tissue repair, and BPC-157 and TB-500 for tissue healing. What they do together, and whether the mix is safe, is unknown.[3,4,5]
How do the units differ between GLOW and KLOW?
With 2 mL of bacteriostatic water, a 70 mg GLOW vial is 35 mg/mL and an 80 mg KLOW vial is 40 mg/mL in total. If the splits are 50/10/10 and 50/10/10/10, each 10 units holds the same amounts of the shared peptides, and KLOW adds 0.5 mg of KPV.
Work out the units for your vial
Milligrams are not comparable between compounds, and the units on your syringe depend on your vial and how much water you add. Each guide has a chart for its common vial sizes.
Questions
Common questions
Is KLOW better than GLOW?
Unknown. Neither blend has been studied, so there is no evidence that adding KPV improves anything in people.
Are GLOW and KLOW FDA-approved?
No. Both are supplier names, not medicines, and none of their components is an approved drug.
Why does the split between peptides matter?
Blend vials are sold by total weight and the split is not standardised. The same 10 units can hold different amounts of each peptide depending on the label, so check it and use the blend calculator.
What are the side effects of GLOW and KLOW?
Unknown, because neither combination has been studied. Their components were on the FDA's compounding safety-risk list for immune-reaction risk and limited human data; those listings show as withdrawn as of April 2026.
Sources
- 1.PepT1-mediated tripeptide KPV uptake reduces intestinal inflammation
Dalmasso G et al. Gastroenterology 2008;134:166-178 · Animal study - 2.FDA compounding safety-risk list
FDA. Bulk drug substances for compounding that may present significant safety risks (as of Apr 22, 2026) · FDA - 3.Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data
Pickart L, Margolina A. Int J Mol Sci 2018;19:1987 · Review - 4.Emerging use of BPC-157 in orthopaedic sports medicine: a systematic review
Vasireddi N et al. HSS J 2025;21:485-495 · Review - 5.Thymosin beta4 accelerates wound healing
Malinda KM et al. J Invest Dermatol 1999;113:364-368 · Animal study
Last reviewed Nov 7, 2026. Education only, not medical advice. PepDose sells no peptides.