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Hair grows in cycles, so meaningful changes are unlikely to be measured after only a few days
Some people report feeling more energized within a few days of their first shot
Hypersensitivity reaction to cyanocobalamin
Muscle function and recovery appear to be enhanced, at least in aged mice
Here are some groups of people who might benefit from B12 supplementation: Vegetarians and Vegans: Since B12 is primarily found in animal products, those who avoid meat, dairy, and eggs may be at risk of deficiency
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