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International Unit (IU)

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A measure of biological activity used for some substances (like HCG or HGH) instead of mass. It is not interchangeable with insulin “units” on a syringe.

The overlap in the word "unit" is a frequent source of error: an International Unit measures biological activity for substances like HCG or HGH and has no fixed relationship to the volume-based "units" printed on an insulin syringe. A reconstitution calculator built around milligrams and syringe units cannot convert an IU-labelled product without a substance-specific conversion factor first.

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Peptide dosage guideThe reconstitution formula and a worked example.Peptide libraryProfiles, dosing and reconstitution for 100+ compounds.

More glossary terms

Intramuscular (IM)IntranasalLoading doseLyophilizedMass spectrometryMelanocortinMicrogram (mcg)Milligram (mg)Needle gaugeNet peptide contentNootropicPeptide bond

Educational reference only — not medical advice. Always follow the guidance of a qualified healthcare professional.