It's not super common, but it does happen
Biotin Injection Biotin (Vitamin B7) is a water-soluble B vitamin that acts as an essential cofactor for carboxylase enzymes involved in fatty acid synthesis, gluconeogenesis, and amino acid metabolism
Subcutaneous injection was chosen as 5A-1MQ specifically has poor oral bioavailability in mice, a phenomenon that does not occur in rats 26
Originally characterized at the University of Florida by the Stephen ORahilly and Robert Kraft groups, the compound has been studied in preclinical research for body composition, adipose tissue lipolysis, glucose homeostasis, skeletal muscle aging, and metabolic disease endpoints
Why We Must Have Vitamin B12 A water-soluble vitamin, vitamin B12 is essential to everybody