Check labels: authorized drugs for sale in Canada have an 8-digit Drug Identification Number (DIN) printed on the label
(3) Bruno BJ, Miller GD, Lim CS
The distinction between supplements and medications is important, as illustrated by the example of B12, which can be bought as a supplement but requires a prescription when given as an injectable shot, and it is unclear if this distinction will apply to peptides, 2m6s
If you reconstitute with an unusual volume, say 2.5mL for a 4mg/mL concentration, the formula still gives you the exact unit measurement
Kurbasic M, Garcia AM, Viada S, Marchesan S