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It also depends on how deficient you are already

Cyanocobalamin BNF Drug Monograph

Thiocyanate, a byproduct of cyanide detoxification, can also harm the thyroid gland by competing with iodine, though this is generally observed only in populations exposed to high levels of cyanide through occupational sources or diets extremely high in cyanoglycosides, typically in regions with low soil iodine (Amar, 2015)

2.How can we guarantee quality

Perhaps now theres a real chance that we can get our B12 injections made available over the counter and bring us into line with other countries around the world so that we in the UK arent left behind