Important: Retatrutide is investigational. It is currently in clinical trials and is not FDA-approved and not available as an approved product. This page is educational only and is not medical advice — it does not recommend taking it. To work out the units for a reconstituted vial, you need two numbers you already have: the milligrams (mg) of compound in the vial and the milliliters (mL) of liquid you mixed in. From those, this page shows the concentration math and how to convert any dose into syringe units. It is a mixing-math (concentration) tool, never a dosage calculator. Always confirm every figure with your physician or pharmacist.
Retatrutide is an investigational compound being studied in clinical trials. It is not FDA-approved and is not sold as an approved product. Because of that status, there is no official, approved product label to read, and any figures you see online are not approved instructions. This page does not endorse using it. If you have questions about Retatrutide or any GLP-1-type medicine, that is a conversation for a licensed prescriber. For prescription GLP-1 medicines that are approved, defer entirely to your prescriber and see our GLP-1 guide rather than relying on any number here.
Lyophilized (freeze-dried) peptides are typically reconstituted with bacteriostatic water, which is what we use in the arithmetic example below. We mention this only so the math is concrete — it is not a recommendation, and the right diluent for any specific vial is something your pharmacist confirms.
Here is the key point that confuses people: the choice of diluent does not change the concentration math. Concentration depends only on how many milligrams are in the vial and how many milliliters of liquid you added. Whether the liquid is bacteriostatic water or another diluent, 6 mg dissolved in 3 mL is still 2 mg/mL. The liquid affects storage and comfort, not the units-per-dose arithmetic.
The two formulas never change:
Remember: 1 mg = 1000 mcg.
Example 1 — example only; your vial may differ, confirm with your pharmacist. Suppose a vial holds 6 mg and you added 3 mL of bacteriostatic water.
Example 2 — example only; your vial may differ, confirm with your pharmacist. Suppose a vial holds 12 mg and you added 2 mL.
These numbers are neutral illustrations of the arithmetic, not suggested amounts. Commonly-reported vial sizes and amounts do circulate online, but those are educational references only and not a recommendation — confirm everything with your physician.
A few honest reminders:
It depends entirely on the concentration of your vial, which you set when you reconstitute it. Units = dose mcg ÷ concentration × 100 on a U-100 syringe, where concentration = vial mg × 1000 ÷ water mL. For example, at 2000 mcg/mL, a 1000 mcg amount works out to 50 units — but that is only an arithmetic example. Your vial may differ; confirm the numbers with your pharmacist. This is mixing math, not a dose recommendation.
There is no single answer, and this page does not recommend one. The amount of water you add is what sets the concentration: more water means a more dilute mix and more units per dose; less water means more concentrated and fewer units. Because Retatrutide is investigational and not FDA-approved, there is no approved label to follow — discuss the right diluent and volume with your pharmacist or physician.
No. Retatrutide is investigational — it is in clinical trials and is not FDA-approved or available as an approved product. This page is educational only and does not recommend using it. Any questions about whether a compound is appropriate for you should go to a licensed physician.
No. The units depend only on the vial's milligrams and the milliliters of liquid you added — the concentration math is the same regardless of which diluent is used. The diluent affects storage and comfort, not the arithmetic. Always confirm the correct diluent and amounts with your pharmacist.