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It's found naturally in animal products such as fish, diary and yeast

Food and Drug Administration and are also banned by the WADA code, either under its "S2" category that encompasses peptides or under its "SO" classification, a catch-all category for "non-approved substances." The few substances specifically listed under the "S0" category such as the popular BPC 157 are placed there because the pharmalogical make-up of the substances don't fit neatly into another category on the banned list

Bryant, Future Foods

(14) While some studies suggest B12 could be beneficial in treating insomnia and sleep disorders, other studies remain largely inconclusive or link high-dose B12 to sleep impairment and short sleep duration - the opposite of what we want