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Vitamin B12 injections help your body convert the food you eat into energy

If youve ever had a tuberculosis test where you receive the injection under your skin and then get checked a day later to see if theres any puffiness, what theyre testing for is something called a delayed-type hypersensitivity reaction. Side effects of COVID arm typically occur about seven days after the first shot and about two days after the second dose

Avoid disease-treatment claims, dosage instructions, or medical promises

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Vitamin C is required for collagen synthesis (specifically for the hydroxylation of proline and lysine residues)

PMID 18709883