Compounded tirzepatide reconstitution — step-by-step with photos

I keep seeing people confused about reconstitution math for compounded tirz lyophilized powder so I'm making a guide. Mods feel free to pin this. The formula is simple: > Volume of BAC water (mL) = Amount of peptide (mg) ÷ Desired concentration (mg/mL) Example for a 30mg vial at 10mg/mL: 30mg ÷ 10mg/mL = 3mL of BAC water Example for a 60mg vial at 10mg/mL: 60mg ÷ 10mg/mL = 6mL of BAC water Common concentrations and their injection volumes: | Dose | At 10mg/mL | At 20mg/mL | At 50mg/mL | |------|-----------|-----------|-----------| | 2.5mg | 0.25mL (25 units) | 0.125mL (12.5 units) | 0.05mL (5 units) | | 5mg | 0.50mL (50 units) | 0.25mL (25 units) | 0.10mL (10 units) | | 7.5mg | 0.75mL (75 units) | 0.375mL (37.5 units) | 0.15mL (15 units) | | 10mg | 1.00mL (100 units) | 0.50mL (50 units) | 0.20mL (20 units) | | 12.5mg | 1.25mL (125 units) | 0.625mL (62.5 units) | 0.25mL (25 units) | | 15mg | 1.50mL (150 units) | 0.75mL (75 units) | 0.30mL (30 units) | "Units" = markings on a standard U-100 insulin syringe where 100 units = 1mL. Pro tips: - Use a 1mL syringe for accuracy at small volumes - Inject BAC water slowly down the side of the vial — DO NOT shake - Swirl gently until fully dissolved (should be clear, no particles) - Store reconstituted solution in fridge, use within 28 days