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side affects of too much b12 injections Feeling worse after Injection: Answering concerns Are There Any Side Effects
Description
A healthy body needs Vitamin B12 to produce healthy red blood cells that can take oxygenated blood around the body and keep the central nervous system functioning correctly

Finally, this is an argument used regularly against meat: [Vitamin] B12 in meat is from supplements given to cows so why not just take [Vitamin B12 as a supplement] directly, anyway

Intestinal absorption of water-soluble vitamins: An update

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