About DoseMarks

Why we built it

Injectable peptides and compounded medications come in two forms. Some arrive as a freeze-dried powder that is mixed with a diluent; many compounded GLP-1 vials instead arrive as a ready-made liquid with the concentration printed on the pharmacy label. Either way, the number of units you draw depends on the concentration — and mixing up mg, mL and units can double or halve a dose. DoseMarks does that conversion and shows every step, so you can check it.

How we calculate

• Concentration (mg/mL) = the labeled concentration after preparation, or total mg in the vial ÷ final solution volume in mL confirmed by the product instructions or pharmacist. Final volume may differ from diluent volume added. Do not add water to a ready-mixed vial.
• Volume (mL) = your dose in mg ÷ concentration.
• Units = volume × 100, because on a U-100 syringe 100 units = 1 mL.

Every result has a “Show the math” panel with your own numbers filled in. We also tell you when a dose falls between the printed marks on your syringe, when it won’t fit in one syringe, and when it’s too small to measure reliably. We can tell you the math works; we can’t tell you whether a particular diluent, volume or mix is right for your product — that comes from its instructions and your pharmacist. The formulas are covered by automated tests that run before every release.

Where our information comes from

Dose steps appear only for medications whose FDA prescribing information defines them (tirzepatide and semaglutide). The tables identify the brand, injectable formulation and adult indication they cover; they are not personalized treatment plans. Only those pages start with a dose filled in — the label’s starting dose. Everywhere else the dose field starts empty: for investigational or research compounds we do not suggest doses, and the calculator only converts the dose you enter. Lookup tables are explicitly labeled as arithmetic examples. Each page links to the sources behind its claims.

What we will never do

• Tell you what dose to take. That is a decision for you and your prescriber.
• Sell peptides, medications or “research chemicals”.
• Invent credentials. Our pages are not currently reviewed by a licensed clinician, and we say so rather than imply otherwise.
• Let money change the math. If we ever show ads or link to partners, those links will be clearly labeled.

Found a mistake?

Accuracy is the whole point of this site. If anything looks wrong, email [email protected] and we’ll fix it. See also our medical disclaimer.