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Neither source is perfect alone
A lack of B12 can cause anemia, making you feel tired and weak
Confirm with a serum B12 test (below 300 pg/mL warrants supplementation
Some people come in for a boost of energy, while others want to strengthen their immune system, improve mood, or enhance metabolism
Most patients describe the sensation as a brief pinch or mild sting, with only slight soreness or tenderness at the injection site that fades within a day
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