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Where R can be any number of chemical groups including the two active forms of vitamin B12, adenosyl and methyl B12, but also a myriad of inactive groups, such as hydroxycobalamin, cyanocobalamin, nitrosylcobalamin, cysteinylcobalamin, glutathionylcobalamin, Co(II)cobalamin, aquocobalamin, chlorocobalamin, sulfitocobalamin, thiocyantocobalamin, homocysteinylcobalamin amongst others (Hannibal et al, 2008)

Common preservative systems for peptide formulations include phenoxyethanol, potassium sorbate, or commercially available broad-spectrum preservative blends

That said, everyone's body is different

This combination works to support various aspects of metabolic health