Informational use only — not medical advice. For adults 21 and over. Talk to a qualified healthcare professional before making decisions about medications or supplements.

Home › Guides › How much BAC water for a 5 mg vial?

How much bacteriostatic water for a 5 mg vial?

There is no single right amount. The water sets the concentration, and the concentration sets how many units you draw. The useful question is "what concentration do I want?", and then the water follows from the vial size.

Informational use only — not medical advice. Check every figure against your own product and talk to a licensed healthcare provider before starting or changing anything.

The rule

Water (mL) = vial (mg) ÷ target concentration (mg/mL).

Pick a concentration that makes your usual dose a whole number of units, then apply it to whatever vial size you bought. A 5 mg vial at 3.33 mg/mL takes 1.50 mL; a 10 mg vial at the same concentration takes 3.00 mL; the syringe then reads the same for both.

Why one concentration per compound

Dosify Me assigns each compound a target concentration and mixes every vial size to it, as long as the water fits in the vial (usually 3 mL at most). That is why the app can say "200 mcg is 6.0 units" of BPC-157 whichever vial you have. A larger vial that would need more water is mixed more concentrated instead, and its doses read fewer units. If you change the water, the app recalculates — but the default keeps the common doses on whole units.

Water per vial size

Compound	Vial	Water	Concentration
BPC-157	5 mg	1.50 mL	3.33 mg/mL
BPC-157	10 mg	3.00 mL	3.33 mg/mL
TB-500	5 mg	1.50 mL	3.33 mg/mL
TB-500	10 mg	3.00 mL	3.33 mg/mL
Ipamorelin	5 mg	2.00 mL	2.5 mg/mL
Ipamorelin	10 mg^*	3.00 mL	3.33 mg/mL
Semaglutide	5 mg	1.00 mL	5 mg/mL
	10 mg	2.00 mL	5 mg/mL
	20 mg^*	3.00 mL	6.67 mg/mL
Tirzepatide	5 mg	0.50 mL	10 mg/mL
	10 mg	1.00 mL	10 mg/mL
	15 mg	1.50 mL	10 mg/mL
	20 mg	2.00 mL	10 mg/mL
	30 mg	3.00 mL	10 mg/mL
	40 mg^*	3.00 mL	13.33 mg/mL
	50 mg^*	3.00 mL	16.67 mg/mL
	60 mg^*	3.00 mL	20 mg/mL
	100 mg^*	3.00 mL	33.33 mg/mL
	120 mg^*	3.00 mL	40 mg/mL
CJC-1295 (No DAC)	5 mg	2.99 mL	1.67 mg/mL
CJC-1295 (No DAC)	10 mg^*	3.00 mL	3.33 mg/mL
GHK-Cu	50 mg	2.50 mL	20 mg/mL
GHK-Cu	100 mg^*	3.00 mL	33.33 mg/mL

^* This size is conventionally mixed more concentrated rather than diluted further — fewer units per dose than smaller vials of this peptide.

Every compound page has this table for its own vial sizes: peptide dosing reference.

How to actually mix it

Let the vial and the water reach room temperature. Wipe both stoppers with alcohol.
Draw the water into a syringe. For 1.50 mL, that is 150 units on a U-100 syringe, or a 3 mL syringe for larger volumes.
Push the needle through the stopper at an angle and run the water down the glass wall, not onto the powder.
Swirl gently. Do not shake; peptides are fragile chains.
Label the vial with the date and the concentration. Refrigerate. Most reconstituted peptides are used within about four weeks; the app's vial countdown warns before you run out.

Questions people ask

How much bacteriostatic water do I add to a 5 mg vial?

Divide the vial by the concentration you want. For BPC-157 the app targets 3.33 mg/mL, so a 5 mg vial takes 1.50 mL and a 10 mg vial takes 3.00 mL. For semaglutide at 5 mg/mL a 5 mg vial takes 1.00 mL.

Does more water make the dose weaker?

It makes each unit weaker, not the dose. You draw more units to get the same micrograms. More water only helps when your dose would otherwise be a fraction of a unit.

Can I use sterile water instead of bacteriostatic water?

Sterile water has no preservative, so a multi-dose vial should be used within a day or so. Bacteriostatic water contains 0.9% benzyl alcohol and is the standard for vials drawn from over days or weeks.

What if the vial is too small for the water?

Dosify Me puts at most 3 mL in a vial unless the compound sets its own limit. If a large vial size would need more than that, it is mixed to a stronger concentration and each dose is fewer units. The per-compound pages mark those sizes.

Dosify Me does this math for you. Pick the compound, your vial size and dose, and the app draws the exact syringe reading, keeps your schedule and reminders, and logs every dose — privately, on your phone.

Get Dosify Me on Google Play Get Dosify Me on the App Store

BAC water calculator — enter your vial, dose and the units you want to draw; it gives the mL of water to add.
How to reconstitute peptides — the full walkthrough.
How many units is 250 mcg?
Reconstitution calculator

Pages for the compounds in this guide

Figures computed from the Dosify Me compound database on 2026-10-08.