are b12 injections subcutaneous or intramuscular Optimal Injection Sites for Maximum Absorption and Benefits Best Vitamin B12 Injection Sites:

1 2 Valentino, Michael A

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Seek medical help if you notice any unusual symptoms after an injection

Symptoms of vitamin B12 deficiency can vary widely and may include fatigue, weakness, pale skin, shortness of breath, neurological symptoms such as numbness or tingling in the hands and feet, difficulty walking, memory loss, and mood changes

Can you get too much vitamin B12

UV light causes copper to catalyze free radical formation, which oxidizes the histidine and lysine residues that coordinate the metal