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Units?
Unified atomic mass units (u) aka Daltons, clearly
Does that also measure the pep and/or vigor?
“25 of some system of measurement which we will not tell you” doesn’t fit on the box as easily.
A unit used to measure the activity of many vitamins, hormones, enzymes, and drugs. An IU is the amount of a substance that has a certain biological effect. For each substance there is an international agreement on the biological effect that is expected for 1 IU. Also called International Unit.
Units.