Because this site touches on health-related terminology, we rely on official sources and say clearly where they are used.
Official sources
- U.S. Food and Drug Administration (FDA). Official U.S. drug regulator.
- DailyMed (U.S. National Library of Medicine). Searchable database of current official drug labels.
- Drugs@FDA. FDA database of approved drug products and their labeling.
- Humatrope prescribing information (FDA label PDF). An example of an official somatropin label. Used on this site to illustrate how labels state strengths and concentrations.
How sources are used
- Product facts (strengths, concentrations, units) are taken from official labeling and described per product, never generalized across products.
- Mathematics uses standard metric relationships and is covered by automated tests.
- No universal IU factor. A relationship between IU and mg is only used if the user supplies one from their own label.
Corrections
Labels change. If you spot an out-of-date or incorrect statement, please tell us and include a link to the official source.