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10.1186/s12967-017-1315-4

[16] There is no advantage to the use of adenosylcobalamin or methylcobalamin forms for the treatment of vitamin B 12 deficiency

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More recent studies have reported alterations in monoamine metabolism in the cerebrospinal fluid and plasma of individuals with ME/CFS, particularly elevated levels of the serotonin metabolite 5-hydroxyindoleacetic acid (5-HIAA), suggesting increased central serotonergic turnover (Demitrack et al., 1992

You wont have to look hard to find that it was made in GMP-compliant facilities in the United States, and its allergen notice is prominently displayed

Metabolism 60 , 17811789 (2011)