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Vitamin B12 also supports concentration, memory, and cognitive function
Like headaches, this tends to occur early in use and resolve as the body adjusts
For information about supplements that have been investigated in humans for athletic performance and joint health, see our Reviews of Muscle and Workout Supplements , Collagen Supplements , Nitric Oxide Supplements , and Joint Health Supplements
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Having a lack of intrinsic factor (IF) , a substance that binds to B12 so it can be absorbed into the bloodstream (5)
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