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Though it differs a bit from one person to another, the effects of B12 vitamins usually last around 48 hours to 72 hours after the initial injection
Older adults, as well as those with digestive issues or who are vegan or vegetarian, could struggle with B12 deficiencies
If you still feel a little tender, applying a cold pack to the site for about 15 minutes can also provide quick relief from pain and swelling
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