Calculator
This is the concentration of the solution, not a dose. PeptideCheck does not recommend doses or the use of these substances.
Educational concentration tool
Reconstitution & concentration — and the calculation errors that bite people
Use this to understand the concentration of a reconstituted solution and to see where the math commonly goes wrong. It does not tell you how much to use, and nothing here is medical advice.
Concentration tool — read this. This calculator reports the concentration of a reconstituted solution for educational purposes only. It is not a dosing or injection calculator, it does not recommend doses, and it is not medical advice. In plain language: this is not a dosing or injection calculator. PeptideCheck does not sell peptides or advise their use. Consult a licensed professional for any health decision.
The one formula that matters
Concentration = amount ÷ volume. Put 10 mg of peptide into 2 mL of water and you have 5 mg per mL. Put the same 10 mg into 5 mL and you have 2 mg per mL — same peptide, weaker solution. More water never means more peptide; it means a lower concentration.
Worked example
A 10 mg vial reconstituted with 2 mL of bacteriostatic water gives a concentration of 5 mg/mL (= 5,000 mcg/mL). This describes the strength of the solution only — it is not a dose and not an instruction for use.
Common calculation errors
- Confusing milligrams (mg) with micrograms (mcg). 1 mg = 1,000 mcg. Slipping between the two is a 1,000× error.
- Treating the vial's total as a concentration. “10 mg” on a vial is the total amount in the vial, not a concentration. It only becomes a concentration once you know how much water was added.
- Getting the dilution direction backwards. Adding more water makes the solution weaker per millilitre, not stronger.
- Treating volume markings as peptide amounts. Volume scales measure liquid volume, not micrograms of peptide. This page explains concentration math only, not how to measure or administer anything.
- Decimal and rounding slips. A misplaced decimal point is a 10× error. Recompute and sanity-check whether the answer is plausible.
Why getting the math right matters
Because the errors above aren't small — they're 10×, 100×, or 1,000× off. Understanding the concentration math is basic numeracy that prevents gross mistakes.
Regulatory note
This article is provided for understanding, not as encouragement. In Canada, most injectable peptides are regulated as prescription drugs, Health Canada has not authorized “research-use-only” peptides sold online, and it has advised people not to inject unauthorized peptides. “For research use only” labelling does not make a product legal, exempt, or safe. See our Is it legal in Canada? page.
The information here is general educational information, not medical or health advice. References to research describe what studies have investigated — not outcomes, benefits, or recommendations. Consult a licensed healthcare professional.