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NHS guidance is clear that it should be prescribed and given by, or under the supervision of, a suitably qualified professional
In contrast, the long-term use of artificial cyanocobalamin supplements does not have a direct biological effect and must first be converted in the body into one of the three natural forms of B12
They also play an important role in the production of brain messengers known as neurotransmitters
doi:10.1080/00016489.2021.1957145
Even if a peptide is promoted as natural or recovery-focused, that does not mean it is allowed in sport