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Vitamin B12 (Cyanocobalamin) is known as the energy vitamin, helping to decrease fatigue and stimulating the use of fats, proteins, and carbohydrates in the body
(In fact, some researchers have linked vitamin D supplementation to an improvement in delayed or missed periods.) RELATED: How much vitamin D should I take
Twenty-one days
Vitamin B12 deficiency can be caused by not getting enough of it, problems with absorbing it, or taking a medication that interferes with its absorption.
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