GLOW and KLOW are the same three-peptide blend with one difference: GLOW holds 10mg BPC-157, 10mg TB-500 and 50mg GHK-Cu (70mg in total), and KLOW contains all of that plus 10mg of the tripeptide KPV (80mg in total). Both vials are listed at $179.99 CAD, so on a bulk order the choice is not about price but about whether your experimental design needs KPV present in the vial or needs it absent.
That equal pricing makes this an unusual comparison. Below we set out the per-milligram and per-component economics at every volume tier, show what the blend saves over assembling the same contents from single vials, and explain why many buyers end up ordering both.
What each tier costs for the two blends
Per-mg figures are the tier price of the vial divided by its total label mass (70 or 80). Tier factors are 0.95, 0.85, 0.75 and 0.65, applied by total vial count across the cart.
| Cart size | Price per vial (either blend) | GLOW 70mg per mg | KLOW 80mg per mg |
|---|---|---|---|
| 1 vial | $179.99 | $179.99 ÷ 70 = $2.57 | $179.99 ÷ 80 = $2.25 |
| 2–3 vials (5% off) | $170.99 | $2.44 | $2.14 |
| 4–6 vials (15% off) | $152.99 | $2.19 | $1.91 |
| 7–9 vials (25% off) | $134.99 | $1.93 | $1.69 |
| 10+ vials (35% off) | $116.99 | $1.67 | $1.46 |
Per milligram KLOW always looks cheaper, but that is only because the extra 10mg of KPV rides along at no charge. If KPV plays no part in your design, the lower figure means nothing to you and the useful comparison is the price of the shared components, which is identical.
The blend against the same contents bought as singles
The three shared components are all sold separately. One BPC-157 10mg ($95.99), one TB-500 10mg ($105.99) and one GHK-Cu 50mg ($63.99) add up to $265.97 at list, against $179.99 for one GLOW vial: a difference of $85.98, or about 32%. The singles route buys flexibility rather than economy: you can vary each component, run each one alone, or leave one out. Note that three single vials also count as three toward a tier, which narrows the gap on a large order but does not close it.
Composition side by side, in mass and in moles
| Component | Molar mass | GLOW: mg / µmol / mole share | KLOW: mg / µmol / mole share |
|---|---|---|---|
| BPC-157 (15 residues) | 1419.5 g/mol | 10 / 7.0 / 4.9% | 10 / 7.0 / 4.1% |
| TB-500 (Ac-LKKTETQ) | 889.0 g/mol | 10 / 11.2 / 7.9% | 10 / 11.2 / 6.6% |
| GHK-Cu (1:1 complex) | 402.9 g/mol | 50 / 124.1 / 87.2% | 50 / 124.1 / 72.3% |
| KPV (Lys-Pro-Val) | ~342.4 g/mol | — | 10 / 29.2 / 17.0% |
| Total | 70mg / ~142 µmol | 80mg / ~172 µmol |
The molar view changes how the vials read. GHK-Cu is the dominant species by number of molecules in both blends, and in KLOW the KPV component outnumbers BPC-157 and TB-500 combined. When you convert a blend concentration into the concentration of one component, work from that component’s share, and use net peptide content rather than label mass: net content explained, and the molarity calculator for the arithmetic.
Mixing the two blends to reach a tier
The bulk pricing ladder counts every vial in the cart, so GLOW and KLOW combine freely. Five of each is ten vials: $1,799.90 at list, $1,169.90 after 35%, which is the same $116.99 per vial either way. A study that needs KLOW as the test material and GLOW as the matched no-KPV comparison can therefore be supplied at the top tier without over-buying either. If you also want single-component controls, adding a few singles to that cart keeps them in the same tier.
What analysis has to cover in a four-component vial
A single purity figure for a blend is harder to interpret than one for a single peptide, because the chromatogram carries three or four species with very different properties. GHK-Cu is a copper complex rather than a free peptide, and its chromatography depends on whether conditions keep the copper bound (see copper coordination in GHK-Cu and its registry numbers and masses). KPV is small and polar, so it can elute early and sit close to other early peaks; KPV identity analysis covers that. For how a blend certificate should be read, go to purity and composition in multi-peptide vials, then to the component-by-component articles on GLOW and KLOW.
Our products are third-party tested by HPLC and purity testing at 99%+ purity. Certificates for some products are published on the COAs page, and each vial is matched to its certificate by cap and crimp colour.
Where each component appears in the literature
At in-vitro level the four components are studied for unrelated things. BPC-157 papers look at fibroblast and endothelial migration assays; the LKKTET region of TB-500 is thymosin β4’s actin-binding motif; GHK-Cu is studied for its copper binding and in fibroblast culture work on extracellular matrix; and KPV, the C-terminal tripeptide of α-MSH (residues 11–13), has been examined in cell models of NF-κB signalling. Adding KPV therefore introduces a component with its own separate research literature rather than more of an existing one. None of these reports demonstrates any effect beyond the laboratory model used.
Which blend to put in the cart
- Your design has no role for KPV: GLOW. The KPV in KLOW would be an uncontrolled extra variable, however free it is.
- You are studying the four-component mixture: KLOW, with GLOW ordered alongside as the minus-KPV comparison.
- You are still developing the method: one of each is two vials and already 5% off.
- You need to vary component ratios: neither blend. Buy singles; the blends are fixed.
Storing a case of blend vials
Keep unopened vials sealed and cold, and only reconstitute what the next stage of work will use; see stability of lyophilised peptides. GLOW and KLOW are separate products with separate batches, so record the batch printed on each certificate the day the order arrives, shelve the two products in clearly labelled separate boxes, and quote both batch references when you reorder.
Frequently asked
Is KLOW better value than GLOW?
Only if you need KPV. Both vials cost the same, and the shared contents are identical.
Do GLOW and KLOW count together for volume pricing?
Yes. Five of each makes ten vials and qualifies for 35% off.
How much cheaper is GLOW than buying its three peptides separately?
About $86 per set at list, roughly 32%.
Which component is most abundant in either blend?
GHK-Cu, by mass (50mg) and even more so by moles.
Can I order larger quantities than the ladder covers?
Yes; see wholesale supply for custom quotes.
Other options are in the shop and on the price list; every pairing we cover is on the comparisons hub.
For laboratory research use only. Not for human or veterinary use.
