mg vs mcg on a peptide vial: the mix-up that wastes vials

When you're looking at a peptide vial, the unit on the label is usually different from the unit you'll be using when you dose. The vial will typically be labeled in a larger unit, while you'll be working with a much smaller one, which can cause confusion.

The gap between these units is huge, so mixing them up can waste a whole vial. The single most common beginner mistake is calculating with the wrong unit, the label says one thing, your mental math assumes another, and you end up off by a factor of a thousand.

A boring habit that fixes it: never let a bare number float on its own. Every time you write down or read a number, keep the unit glued to it, and confirm the vial's unit and your target unit actually match before doing any math.

You'll get the hang of it once you've done it a few times, but it's worth slowing down on at the start. What tripped you up most when you were new to this?