How do I convert between milligrams, micrograms, and International Units when calculating peptide doses?

1mg = 1000mcg (micrograms). International Units (IU) vary by peptide - for example, HCG is 5000 IU per mg, while insulin is 100 IU per mg. Always verify the specific IU-to-mg conversion factor for your peptide on the manufacturer's certificate of analysis. USP pharmaceutical calculation standards provide conversion guidelines.