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Two common forms are methylcobalamin and cyanocobalamin, and your provider chooses based on your situation
If levels decline, adding b12 becomes appropriate with clear justification
In an uncontrolled trial in 100 men with infertility, a combination supplement containing 800 mg alpha-lipoic acid, 100 mg betaine, 400 mcg folic acid, 1,000 mg myo-inositol, 2.6 mg B12, 1.7 mg riboflavin, and 1.9 mg B6 was tested and reported to improve sperm concentration, motility, and morphology
You have Leber& References Around 10%15% of individuals aged 60 and older are affected by vitamin B12 deficiency
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