GLOW Peptide Blend Dosage Guide: Reconstitution & Units

GLOW is a common name for a research peptide blend that combines GHK-Cu, BPC-157, and TB-500 in a single vial. Because the three peptides ship premixed, a GLOW peptide blend dosage guide has to account for one extra step that single-peptide guides don't: the vial's total milligram count is split across three compounds in a fixed ratio, and that ratio carries through every draw. This is a research reference for that math, not medical advice.

What's in a GLOW peptide blend

A GLOW vial is typically supplied as lyophilized powder containing three peptides at fixed amounts:

• GHK-Cu — 50 mg
• BPC-157 — 10 mg
• TB-500 — 10 mg

That's 70 mg of total peptide content per vial, in a 5:1:1 ratio. Reconstitution dissolves all three into a single solution — there's no way to draw one component without the other two, since they're mixed together before the water goes in.

Typical reconstitution setup

A common research setup for GLOW keeps the water volume fixed regardless of small variations in vial content, similar to how GHK-Cu alone is often reconstituted:

Vial content	Water added	Concentration
70 mg (50/10/10 GLOW)	3 mL	≈23.3 mg/mL

More water lowers the concentration and produces a larger, easier-to-read draw. Less water raises the concentration and shrinks the draw. The ratio between GHK-Cu, BPC-157, and TB-500 stays 5:1:1 no matter how much water you add — water changes concentration, not composition.

The math

Step 1: Calculate total concentration

Concentration = total vial mass ÷ water volume

70 mg ÷ 3 mL ≈ 23.3 mg/mL

Step 2: Convert dose to volume

Volume (mL) = target dose (mg) ÷ concentration (mg/mL)

Example: 2 mg dose ÷ 23.3 mg/mL ≈ 0.086 mL

Step 3: Convert volume to syringe units

On a U-100 insulin syringe, 1 mL equals 100 units, so:

Units = volume (mL) × 100

Example: 0.086 mL × 100 ≈ 8.6 units

Worked example

Take a 70 mg GLOW vial (50 mg GHK-Cu, 10 mg BPC-157, 10 mg TB-500) reconstituted with 3 mL of bacteriostatic water, for a concentration of about 23.3 mg/mL.

A 2 mg total blend dose comes out to roughly 8.6 units on a U-100 syringe. Because the vial holds the three peptides at a 5:1:1 ratio, that same 2 mg draw breaks down to approximately:

• GHK-Cu: 2 mg × (50 ÷ 70) ≈ 1.43 mg
• BPC-157: 2 mg × (10 ÷ 70) ≈ 0.29 mg
• TB-500: 2 mg × (10 ÷ 70) ≈ 0.29 mg

Those three figures add back up to the 2 mg total dose. The ratio holds at any dose size — doubling the total dose to 4 mg doubles each component's share in the same proportion.

Dose chart

Target total dose	Volume drawn	Units (U-100)
1 mg	≈0.043 mL	≈4.3 units
2 mg	≈0.086 mL	≈8.6 units
2.5 mg	≈0.107 mL	≈10.7 units
4 mg	≈0.171 mL	≈17.1 units

Rather than working through this by hand, enter the vial's total mg, water volume, and target dose into the peptide calculator and it returns the exact units, including a reverse mode that solves for the water volume needed to land a dose on a cleaner mark.

Why the fixed ratio matters

With a single-peptide vial, the only thing that changes your draw is the water you add. With a blend, the manufacturer has already fixed the ratio between compounds before you ever add water — the 50/10/10 split in a GLOW vial isn't something the calculator or the reconstitution step can adjust. If a research protocol calls for a different ratio between GHK-Cu, BPC-157, and TB-500 than the vial provides, that's a reason to reconstitute separate single-peptide vials instead of a pre-mixed blend, not to try to compensate with water volume. Water volume only ever changes concentration, never the underlying ratio.

This is also where dosing errors tend to happen with any peptide, blended or not: not at the injection, but at the reconstitution step, where the water volume added sets the concentration for every draw that follows. Getting that one number wrong carries through to every subsequent dose.

Evidence level

GHK-Cu, BPC-157, and TB-500 are each individually studied in preclinical research — largely animal models and in-vitro work — rather than large controlled human trials. None of the three is FDA-approved for human use, and combining them into a blend doesn't change that evidence picture for any individual component. Treat GLOW, like its component peptides, as a research compound rather than a proven human therapeutic.

Common mistakes

• Treating the blend's total mg as if it were one peptide's dose. A "2 mg GLOW dose" is 2 mg of combined peptide split 5:1:1, not 2 mg of each component.
• Averaging water volume from a single-peptide guide. GHK-Cu alone and a GLOW vial hold different total mg, so the same water volume gives a different concentration in each.
• Shaking instead of swirling. Inject the bacteriostatic water down the inside wall of the vial and swirl gently to dissolve.
• Losing track of which vial is which concentration. If you reconstitute a GLOW vial alongside single-peptide vials, label each one before they end up in the same fridge.

Related

For the reconstitution basics that apply to any peptide vial, see how to reconstitute peptides. For the math behind each individual component, see the GHK-Cu reconstitution calculator, BPC-157 dosage calculator, and TB-500 dosage calculator guides. Or skip straight to the free peptide calculator and enter your GLOW vial's total mg, water volume, and target dose directly.