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But the problem is, your body doesnt produce vitamin B12
De Feo CJ, Aller SG, Siluvai GS, Blackburn NJ, Unger VM
Modification of peptides to such a D-Retro Inverso (DRI)-isoform can render peptides new chemical properties, which may improve their potency in vitro and in vivo (Borsello et al., 2003)
Third-party HPLC-verified 99% purity
