KLOW FAQ: Storage, Mixing and Stability

The questions below are the ones researchers ask most about storing, mixing and handling KLOW. Each answer reflects the blend’s composition, 50 mg GHK-Cu and 10 mg each of BPC-157, TB-500 and KPV in one 80 mg vial, and links to the fuller page where there is one.

How long does KLOW last in the fridge after mixing?

Mixed with bacteriostatic water and kept at 2 to 8 °C in the dark, KLOW lasts 8 to 12 weeks under Vistara Labs’ handling guidance, with quality slowly fading from around week 6 to 8. No published study covers the four peptides together, so the window is the general guidance each component already takes. The full table is on how long KLOW lasts.

How long does unmixed KLOW powder last?

A sealed lyophilised vial keeps for the weeks it is in use at 2 to 8 °C and for months at minus 20 °C, boxed and dark. The dry cake has almost no water, so hydrolysis, copper exchange and ring formation have little to work with. Days at room temperature in transit do not harm it, so it ships without an ice pack.

What is in a KLOW vial?

Four peptides in a fixed ratio: GHK-Cu (Gly-His-Lys with bound copper), BPC-157 (a 15-residue peptide), TB-500 (Ac-LKKTETQ, a thymosin beta-4 fragment) and KPV (Lys-Pro-Val). The 80 mg on the label is their combined mass. The chemistry of the first three is covered in the GHK-Cu, BPC-157 and TB-500 references.

Which component limits KLOW’s storage?

No single one has a shorter published window, but each has its own weak point: GHK-Cu can lose or exchange its copper and is light-sensitive, KPV’s lysine-proline start reacts faster with heat, BPC-157 dislikes acid and TB-500 is cut by enzymes from contamination. Storage follows the least stable of them, so the blend is kept cold, dark, sterile and in plain water. The details are on the KLOW stability page.

Does the copper in GHK-Cu damage the other peptides?

Copper can catalyse peptide oxidation, but the residues it acts on most, methionine, cysteine, histidine, tryptophan and tyrosine, are absent from BPC-157, TB-500 and KPV (Li et al., Biotechnology and Bioengineering, 1995). The open question is copper exchange: GHK-Cu swaps copper readily, and BPC-157 and KPV have free N-terminal amines. That has not been studied in the blend, so a change in the blue is the practical check.

Why is KLOW blue?

The colour is the copper bound in GHK-Cu, not a dye, and it deepens with concentration. Clear blue is normal. Fading, yellowing, greening or a cloudy blue means the copper’s surroundings have changed, and the solution is discarded.

What do you mix KLOW with?

Bacteriostatic water, which is sterile water with 0.9% benzyl alcohol so a refrigerated vial can be accessed more than once. All four peptides are short and hydrophilic, so the blend dissolves fully without acid. Acid and phosphate buffers are avoided because they can disturb the copper. The reasons are on the KLOW solubility guide.

How much bacteriostatic water goes in an 80 mg KLOW vial?

There is no single correct volume. With 2 mL an 80 mg vial gives 40 mg/mL of combined peptide; with 3 mL it gives 26.67 mg/mL. More water spreads the same amount of peptide through a larger volume, so write the chosen concentration on the vial. The tables and calculator, with each component’s share, are on the KLOW reconstitution page.

Can you freeze mixed KLOW?

Not a vial that will be opened again, because repeated freezing and thawing promotes aggregation in peptide solutions. Laboratories that need frozen solution divide it into single-use aliquots and thaw each one once. Sealed powder can be frozen at minus 20 °C without concern.

How is the KLOW nasal spray stored?

It arrives ready-mixed in sterile saline in a sealed metered pump, so it goes into the fridge upright, capped and dark as soon as it arrives, is dated when first opened and is never frozen. The vial’s after-mixing window does not carry over to the spray. More in how to store a peptide nasal spray.