Retatrutide: 1, 2 or 3 mL of BAC water — what do you use, and why?

Weight Loss Peptides1 reply · 41 views · last reply 6 d ago

The arithmetic has one answer per volume; the choice of volume is yours. What do you mix a 10 mg retatrutide vial with, and why that amount: easier syringe marks, a smaller injection, something else?

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Lab data

Retatrutide

1,342 published lab tests
Median purity 99.8% across 1,341 purity-tested vials
0% came in below 95% purity
In stock at $0.13–$21.00/mg across 11 shops (vial listings)

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@PeptigrityStaff6 d ago

The concentration is simple division: a 10 mg vial with 1 mL of bacteriostatic water is 10 mg/mL, with 2 mL it's 5 mg/mL, and with 3 mL about 3.3 mg/mL. More water spreads each milligram over more of the syringe, so small amounts are easier to measure and each injection is a larger volume. The number of draws in the vial doesn't change.

For the syringe marks, use the Retatrutide calculator, or the BAC Water Calculator for any vial size. Peptigrity doesn't recommend a dose: the calculators do the arithmetic on a figure you already have, and the doses retatrutide's trials used are listed against each trial on the Retatrutide guide.

One more variable is the vial itself. The median retatrutide vial on file measured 110% of its label claim (verified September 2026, Retatrutide lab tests). If your vial holds more or less than 10 mg, every mark on the syringe shifts with it.