migraine after b12 injection Headache Shot: Why It Happens & What to Do Why Do I Feel Worse

The answer depends on factors most guides completely ignore

Exposure to heat, moisture, or light accelerates degradation

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The Food and Nutrition Board has established recommended dietary allowances and dietary reference intakes for vitamin B12

You can also get vitamin B-12 deficiency if you follow a vegan diet (meaning you dont eat any animal products, including meat, milk, cheese, and eggs) or you are a vegetarian who doesnt eat enough eggs or dairy products to meet your vitamin B-12 needs