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The theoretical advantages are irrelevant without proof it actually works in humans

J.LindholmT

Climacteric, 16(Suppl 1), 3-16

When suffering from a Vitamin B12 deficiency, injections are the most effective solution for delivering the nutrient to your body

I also had dark urine the day of the vaccine

22b.2.5 Urinary methylmalonic acid excretion Vitamin B12 serves as a cofactor for methylmalonyl CoA mutase (EC 5.4.99.2) as noted earlier.This enzyme acts in the conversion of methylmalonyl CoA to succinyl CoA (Figure 22b.7)
