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the only type of organisms that have the enzymes required for the synthesis of methylcobalamin are bacteria and archaea
PMCID: PMC11050313.
Depends on your situation: If you struggle with hunger and portion control, GLP-1 agonists are more effective
In the UK, buying and injecting B12 yourself is strongly advised against
Vitamin B12 (1,000-5,000 mcg per mL): either cyanocobalamin (synthetic, stable form) or methylcobalamin (active form)
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