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For example, a study published in the American Journal of Clinical Nutrition found that B12 supplements reduced homocysteine levels and improved heart health in older adults
Vitamin B12 injections can be a useful supplementation method for vegans and vegetarians who might struggle to maintain healthy vitamin B12 levels through diet alone
How to Prevent and Overcome Vitamin B12 Overdose The Institute of Medicine reports that there are no adverse effects associated with excess vitamin B12 intake from food and supplements in healthy individuals
they are not a general stimulant
Though not yet proven, limited evidence suggests an increased cancer risk in those with higher-than-normal B12 levels
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