The three forms of vitamin B12, cyanocobalamin, methylcobalamin, and adenosylcobalamin have been shown to have different conversion and absorption rates, with methylcobalamin (the naturally occurring form of B12) regarded as the most optimal for assisting in the methylation cycle
Scott RA, Lagou V, Welch RP, Wheeler E, Montasser ME, Luan J, Mgi R, Strawbridge RJ, Rehnberg E, Gustafsson S, Kanoni S, Rasmussen-Torvik LJ, Yengo L, Lecoeur C, Shungin D, Sanna S, Sidore C, Johnson PCD, Jukema JW, Johnson T, Mahajan A, Verweij N, Thorleifsson G, Hottenga J-J, Shah S, Smith AV, Sennblad B, Gieger C, Salo P, Perola M, et al
Monitoring these factors during a high-intensity exercise test allows us to evaluate the practical benefits of supplementation in real-world athletic performance
Under FDA's interim policy, Category 2 substances are not covered by the enforcement-discretion policy that applies to Category 1, and FDA stated it would consider taking action against a compounder for compounding with a Category 2 substance [11]
That is the traditional medical approach