What Is mcg (Microgram)?
Category: Dosing
One millionth of a gram (1/1,000,000g) or one thousandth of a milligram. Most peptide doses are measured in micrograms. 1 mg = 1,000 mcg.
Detailed Explanation
A microgram (mcg or µg) is a unit of mass equal to one millionth of a gram or one thousandth of a milligram. It is the standard unit of measurement for most peptide doses. Understanding the relationship between units of measurement is essential for accurate peptide dosing: 1 gram = 1,000 milligrams (mg) = 1,000,000 micrograms (mcg). Peptide vials are labeled in milligrams (e.g., 5mg, 10mg), while individual doses are typically measured in micrograms.
Practical Context
Most peptide doses fall in the range of 100-2,000mcg. For example, a standard BPC-157 dose is 250-500mcg, while Ipamorelin is typically 100-300mcg. Some peptides like tirzepatide are dosed in milligrams (2.5-15mg) because the effective doses are larger. When using a reconstitution calculator, always verify whether you are entering values in mcg or mg, as confusing the two can result in 1,000x dosing errors.
Frequently Asked Questions
How do I convert between mg and mcg?
Multiply mg by 1,000 to get mcg, or divide mcg by 1,000 to get mg. For example, 0.25mg = 250mcg, and 5,000mcg = 5mg.
Related Terms
- Concentration - The amount of peptide dissolved per unit of liquid, typically expressed as mcg per unit or mg per ml. Calculated by dividing the total peptide amount by the volume of water added.
- Units (on insulin syringe) - The measurement markings on an insulin syringe. 100 units = 1 ml. When dosing peptides, 'units to inject' refers to how far to draw back the plunger based on the peptide concentration.
- Vial Size - The total amount of peptide powder in a vial before reconstitution, measured in milligrams (mg). Common sizes include 5mg, 10mg, 15mg, and 30mg depending on the peptide.