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The body uses B12 slowly over time, with excess amounts stored for future use, allowing the vitamin to remain in the body for weeks or even months

The only side effect is possible injection site irritation

But unless you have a vitamin B12 deficiency, vitamin B12 injections aren't likely to give you an energy boost." Ironically, the National Institutes of Health says that symptoms of B12 deficiency include loss of appetite and weight loss

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In these cases, shots deliver B12 directly into circulation and can start replenishing stores quickly

At 4C, purity remained above 98% for 28 days