Enter your vial size and how much bacteriostatic water you added, then the target weekly dose in milligrams. The calculator returns the concentration and the exact draw on a U-100 syringe.
Reviewed for accuracy · Last reviewed July 7, 2026The example mixes a 10 mg vial with 2 mL of water, giving 5 mg/mL. At that concentration a 4 mg dose is 0.8 mL, or 80 units on a U-100 insulin syringe. Change any field and the draw updates.
Retatrutide is investigational: the once-weekly 1 mg, 4 mg, 8 mg, and 12 mg doses used here come from its published Phase 2 obesity trial, not from an approved label. It is not FDA-approved and there is no official prescribing dose.
This page is an independent educational reference and is not medical advice, and does not indicate any approval status for any use. Talk to a doctor before starting any compound.