GLOW vs KLOW by the numbers: the 70 mg and 80 mg listed splits, what one draw holds of each peptide at 2 and 3 mL, and the evidence per component.
GLOW and KLOW are two names for pre-mixed research-peptide vials, and "glow vs klow" is searched as if they were rival products. Read from their listed contents, they are the same vial with one ingredient added. This page sets out the splits stated on retail listings, what one draw holds of each peptide at common water volumes, the imbalance the milligram figures hide, and the human evidence for each component. It reports; it does not suggest either vial for anyone.
This site's GLOW page and KLOW page describe each blend and its components; the blend calculator works any stated split; the stacks section covers other combinations.
What the listings state
Product titles on several retail listings read on 2026-09-23 give the same splits. They are quoted here as what the listings state, not as a standard, because no monograph, pharmacopoeia or regulator defines either name, and this site's own KLOW page records that a minority of sources use "KLOW" for KPV with BPC-157 alone.
| Component |
GLOW (70 mg) |
KLOW (80 mg) |
| GHK-Cu |
50 mg |
50 mg |
| BPC-157 |
10 mg |
10 mg |
| TB-500 |
10 mg |
10 mg |
| KPV |
— |
10 mg |
At those splits the comparison reduces to one line: KLOW = GLOW + 10 mg KPV. Nothing in the three shared components differs.
One draw from each vial
A blend's concentration is worked per component: that component's milligrams divided by the water added. On a U-100 syringe, 10 units is 0.1 mL.
| Per 10 units (0.1 mL) |
GLOW, 2 mL |
KLOW, 2 mL |
GLOW, 3 mL |
KLOW, 3 mL |
| GHK-Cu |
2.5 mg |
2.5 mg |
1.67 mg |
1.67 mg |
| BPC-157 |
0.5 mg |
0.5 mg |
0.33 mg |
0.33 mg |
| TB-500 |
0.5 mg |
0.5 mg |
0.33 mg |
0.33 mg |
| KPV |
— |
0.5 mg |
— |
0.33 mg |
Stated as results: at 2 mL, 10 units of either vial is 2.5 mg of GHK-Cu and 0.5 mg of BPC-157 and of TB-500, and KLOW's 10 units adds 0.5 mg of KPV. At 3 mL the same draw is two-thirds of each. The water volume moves every component together; nothing a person adds to the vial changes the 5 : 1 : 1 (: 1) ratio the manufacturer fixed. The general point about why a blend's total milligrams cannot be divided by the water is made on the stacking guide.
The imbalance the milligrams hide
By mass, GHK-Cu is 71.4% of GLOW and 62.5% of KLOW. By number of molecules the gap is wider, because GHK-Cu is small and BPC-157 is large. Using PubChem molecular weights (GHK-Cu 401.9, BPC-157 1,419.5, TB-500 889.0, KPV 342.4):
| Component |
Mass in vial |
Micromoles |
Molecules relative to BPC-157 |
| GHK-Cu |
50 mg |
≈124 |
≈17.7 |
| KPV |
10 mg |
≈29 |
≈4.1 |
| TB-500 |
10 mg |
≈11 |
≈1.6 |
| BPC-157 |
10 mg |
≈7.0 |
1 |
So in a KLOW vial there are roughly four KPV molecules and eighteen GHK-Cu molecules for every BPC-157 molecule. Whatever a component's effect is, the listed splits were set in milligrams, and a milligram is a very different number of molecules from one peptide to the next.
The copper follows from the same arithmetic. Copper's atomic weight is 63.55, 15.8% of GHK-Cu's 401.9, so 50 mg of GHK-Cu carries about 7.9 mg of copper, and a draw holding 2.5 mg of GHK-Cu carries about 0.40 mg. That is calculated from formula weights, not measured in any product.
The human evidence, component by component
Tagged clinical trials in PubMed, searched 2026-09-23 on the name and the common alternatives, with the filter checked against a control:
- GHK-Cu (copper tripeptide): one record tagged as a clinical trial, a 2006 study of a topical copper tripeptide complex on skin after CO2 laser resurfacing. None by injection. The GHK-Cu dosage page sets out the reported figures.
- BPC-157: none tagged. The BPC-157 dosage page covers the registrations and what they state.
- TB-500: the single record returned for "TB-500" or "TB500" with the tag is a 2020 paper on tuberculosis incidence, a false match on the abbreviation, so the genuine count is zero. The TB-500 dosage page covers the registry.
- KPV (Lys-Pro-Val): none tagged under either name. The KPV dosage page covers the preclinical record.
- Control: the same publication-type filter returned 4,284 records for metformin, so a zero here is a real zero for the tag, not a broken query.
No trial of GLOW, KLOW or any pair of their components was found. On the evidence available tonight, the question "which blend works better" has no data behind either answer.
What this comparison cannot settle
A listing's split is a claim about one product. A vial with a different split changes every figure above, and only an assay of that vial shows what it holds. This page does not suggest either blend, a water volume or an amount; the arithmetic describes the vials as listed. Bacteriostatic water and the compound guides for GHK-Cu, BPC-157, TB-500 and KPV are on the Medibact store.
Sources and dates
Opened 2026-09-23: retail listing titles for GLOW 70 mg and KLOW 80 mg blends (several sellers, not named here, since this site names no seller other than Medibact); PubChem compound records for GHK-Cu (CID 165429100), BPC-157 (CID 9941957), TB-500 (CID 62707662) and Lys-Pro-Val (CID 125672), molecular formula and weight; PubMed searches via NCBI E-utilities with the "clinical trial" publication-type filter for each component and for metformin as a control, and the records returned (PMIDs 16847171 and 33318598). Molar and copper arithmetic by this site. Corrections go to the contact page.
