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Participants were randomly assigned to either one of three groups: placebo, 25 mg, or 50 mg of methylcobalamin, given twice a week, by injection into the muscle
Many adults have low vitamin D levelsespecially if they spend most of their time indoors
Vitamin B12 plays a role in promoting healthy cells in nails, hair, and skin
Vitamin B12 deficiency symptoms Weakness, tiredness, or lightheadedness Heart palpitations and shortness of breath Pale skin A painful, smooth, inflamed tongue (glossitis) Digestive issues Bluish or gray-brown nails Loss of appetite What happens if your vitamin B12 deficiency is left untreated
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