are b12 injections intramuscular or subcutaneous vitamin Store vs for vitamin B12 supplements What injection technique uses a

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It is important to get enough vitamin B12 during pregnancy and when nursing, as a B12 deficiency Learn more: What is vitamin B12 deficiency

So on the narrow question does it stop working after N weeks, the honest answer is: no published evidence says it does, and the mechanism actually argues against it

This level of purity ensures consistent research results and minimizes potential variables that can affect experimental outcomes

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are deficient in vitamin B12