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Vitamin C contributes to the regeneration of the reduced form of vitamin E and increases iron absorption
Structure and dynamics of the active human parathyroid hormone receptor-1
doi: 10.1038/nature04808 94 TakeuchiYNishikawaH
L-carnitine deficiency in the body may cause tiredness, irritability, weakness in the hips, shoulders, upper arms and legs, etc
Effect of oral supplementation with L-carnitine on performance time in a 5000 m race and responses of free fatty acid and carnitine concentrations in trained-endurance athletes
However, the research has all been in labs or on animals, making the results difficult to generalize to humans
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