What's in the vial,
and how much water it needs.

There is no one right amount. It depends on how much you want per draw and which syringe you own. The water decides the strength, and the strength decides which line on the syringe your draw lands on. Here is a real example. A 70 mg Glow vial holds 50 mg of GHK-Cu. Add 2.50 mL and you get 20 mg/mL. So a 2 mg draw is 0.10 mL, which is exactly 10 units on a U-100 syringe — a printed line you can see. Add 3 mL instead and the same 2 mg draw becomes 12 units. Both are correct. One is easier to read. That is why our calculators work out the water for you instead of asking you for it.

Divide the mg in the vial by the mL of water. A 5 mg vial with 2 mL of bacteriostatic water is 5 ÷ 2 = 2.5 mg/mL, which is the same as 2,500 mcg/mL. For a blend, do each ingredient separately. A 70 mg Glow vial holds GHK-Cu 50 mg, BPC-157 10 mg and TB-500 10 mg. Add 2.5 mL of water and you get 20 mg/mL, 4 mg/mL and 4 mg/mL. Every draw takes all three, always in that same ratio.

A U-100 syringe splits each milliliter into 100 units. So 1 unit = 0.01 mL, 10 units = 0.1 mL, and 100 units fills it to 1 mL. A U-40 syringe uses a different scale: 40 units per milliliter, so one unit is 0.025 mL. If a number was worked out for U-100 and you draw to "20 units" on a U-40 barrel, you get two and a half times as much liquid. Check which one you have first.

KLOW is an 80 mg blend: GHK-Cu 50 mg, KPV 10 mg, BPC-157 10 mg, TB-500 10 mg. Glow is the same thing minus the KPV, so 70 mg total: GHK-Cu 50 mg, BPC-157 10 mg, TB-500 10 mg. The K in KLOW is the KPV. Neither is a branded product. They are community recipes, so the ratio varies between suppliers. These are the numbers that matched across every source we checked.

No, not before you open it. An unopened vial keeps at room temperature; follow its own label. The benzyl alcohol in it is what stops bacteria growing, and that is what lets you puncture the vial more than once. What needs the fridge (2–8°C) is the peptide after you have mixed it. We could not find a source for how long a mixed vial keeps in a kitchen fridge, so we do not print a number. Check your product label.

No. The calculators only convert the units and volumes you type in. Nothing is filled in for you and nothing is pre-selected. The preset buttons are just division: each one splits the vial into equal draws. When we cannot find a source for a number, we switch off the feature that needs it and say why on the page. We would rather leave a gap than show a number we cannot back up.

Work out the water before you open anything. Once it is in, you cannot take it back out. Then: let the vial warm up to room temperature. Wipe both rubber tops with a fresh alcohol swab and let them air dry. Draw up your measured bacteriostatic water. Tilt the needle so the water runs down the inside of the glass instead of firing straight onto the powder. Let it dissolve on its own, and roll or swirl the vial if anything is left. Never shake it — shaking foams the liquid and breaks the peptide apart. Anything with GHK-Cu in it turns blue. That is the copper, not contamination.

We do not print a number, and that is on purpose. Suppliers do publish stability data — say six months at −80°C, one month at −20°C. But those are lab freezer numbers. They tell you nothing about a vial sitting at 2–8°C in a kitchen fridge, which is what actually happens. Other sites all repeat 28 days. We went looking for where that number comes from and could not find a source that applies here. Keep it cold, keep it dark, and go by the shelf life your supplier gives you.

Sealed powder handles room temperature fine. It ships without cold packs and spends days in transit. Once water is in the vial you are asking a different question, because liquid is the least stable state the peptide will ever be in. The thing to actually worry about is not a warm room, it is heat: a parked car, a sunny windowsill, a radiator, hot water, a microwave. Room temperature and heat are not the same thing.

A smaller syringe does not mean a smaller dose. It means an easier one to read. A 0.3 mL U-100 syringe holds 30 units and prints a line for every single unit. A 1 mL holds 100 units and is usually only numbered every ten. If your answer comes out at 4 units, that is hard to see on a 1 mL barrel and easy on a 0.3 mL. The calculator asks which one you own because the answer changes with it, and it looks for water amounts that land your draw on a line that is really there.