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Given that B12 injections don't directly lead to vitamin injection for weight gain, who are they actually recommended for

However, certain exogenous (i.e., originating from outside of the body, such as in pills or topical products) peptides and growth factors are listed on the WADA Prohibited List under the category S2: Peptide Hormones, Growth Factors, Related Substances and Mimetics

Since a peptide is single-chained, however, by definition it cannot have a quaternary structure [7]

Frequency is based on your individual goals and medical or healthcare provider recommendation, but many patients receive injections weekly or bi-weekly