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However, prolonged high doses of vitamin B12 can lead to various side effects: Anaphylactic shock: This allergic reaction to vitamin B12 is rare but very dangerous, potentially leading to death
Pinch a skinfold at the injection site (abdomen preferred, at least 2 inches from navel) [6]
The body does not need to process the vitamin through digestive pathways that may interfere with uptake
Vitamin B12: How Frequently Should I Get It
Journal of Physiology, Paris, 97 (23), 221226
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