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Description
This includes allergy to thiamine or any other B vitamin in the formulation, or to excipients like benzyl alcohol

Vitamin B12 Foods: Animal and Plant-Based Sources of Vitamin B12 Self-production in the body Vitamin B12 is not produced in plants but in bacteria (microorganisms), which can be found in the earth as well as in the gut of humans and other animals

(PubMed) Capelli I, Cianciolo G, Gasperoni L, et al

I am compound heterozygous for the MTHFR genes
