TB-500 20mg Reconstitution: How Much Bacteriostatic Water & How Many Units

A 20mg vial of TB-500 contains 20,000 mcg. After you add bacteriostatic water, the amount of water decides the concentration — and therefore how many units you draw on a U-100 insulin syringe (1 ml = 100 units). The tables below cover the common water amounts.

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Concentration by water amount

Water added	Concentration	Per 1 unit (0.01 ml)	Per 10 units (0.1 ml)
1 ml	20 mg/ml	200 mcg	2 mg
2 ml	10 mg/ml	100 mcg	1 mg
3 ml	6.67 mg/ml	66.67 mcg	666.67 mcg

How many units to draw

Example doses across the research range listed for TB-500 (2 mg–5 mg). Units are on a U-100 insulin syringe.

Dose	With 1 ml	With 2 ml	With 3 ml	Doses per vial
2 mg	10 units	20 units	30 units	10
3 mg	15 units	30 units	45 units	6
4 mg	20 units	40 units	60 units	5
5 mg	25 units	50 units	75 units	4

How to mix it

Wipe the vial stoppers with alcohol and let them dry.
Draw your chosen amount of bacteriostatic water into a sterile syringe.
Inject the water slowly down the inside wall of the TB-500 vial — not directly onto the powder.
Swirl gently until clear. Do not shake.
Label the vial with the date and concentration, and store it in the refrigerator.

Full walkthrough: Peptide Reconstitution Guide · Injection Guide · TB-500 research profile

FAQ

How much bacteriostatic water do I add to a 20mg TB-500 vial?

Common choices are 1 ml, 2 ml, 3 ml. With 2 ml the concentration is 10 mg/ml. More water makes each dose a larger, easier-to-measure draw; less water keeps injection volume small. The amount of water does not change the dose — only how many units you draw.

How many units is 2 mg of TB-500 from a 20mg vial?

With 2 ml of bacteriostatic water, 2 mg is 20 units on a U-100 (1 ml) insulin syringe. See the table above for other water amounts.

How many doses are in a 20mg TB-500 vial?

At 2 mg per dose, a 20mg vial holds about 10 doses. At higher doses it holds fewer — see the table.