mg vs mcg for Peptide Dosing

Milligrams (mg) and micrograms (mcg) are the same kind of unit at different scales: one milligram equals one thousand micrograms. That thousand-fold gap is why mixing them up is the single most common and costly beginner mistake. Peptide vials are almost always labeled in milligrams, because that describes the total amount of dry powder sealed inside. The doses people actually discuss and draw, though, are usually written in micrograms, because a single dose is a small fraction of the whole vial. If you read the vial's milligram number as though it were your dose, your math is off by a factor of a thousand. The habit that fixes it is simple: never write or read a number without its unit attached, and confirm the vial's unit and your target dose's unit match before doing any calculation. Keep the unit glued to the number every single time.