Metric mass conversions are fixed. IU (international units) measure biological activity, not mass, so there is no universal mg↔IU conversion. Convert any value with the unit converter.
| From | Equals |
|---|---|
| 1 mg | 1,000 mcg |
| 1 mg | 1,000,000 ng |
| 1 mcg | 1,000 ng |
| 0.25 mg | 250 mcg |
| 0.5 mg | 500 mcg |
| 2.4 mg | 2,400 mcg |
IU: depends on the substance — use the mg-per-IU factor from your vial or certificate of analysis.
Reference values are approximate and compiled for education only — not medical advice and not dosing guidance. Half-lives and concentrations vary by source, formulation and individual. Always verify against primary literature and your material's certificate of analysis.