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Supports normal nerve function. Whether youre shopping Vitacost vitamins, minerals, herbs or other key nutrients, their potency is guaranteed whats on the label is whats in the bottle. Vitacost Magnesium Citrate 400 mg Magnesium per serving - 120 Tablets Plus, all Vitacost supplements adhere to the FDAs Current Good Manufacturing Practices (CGMPs), ensuring that they are manufactured to high standards of POTENCY, PURITY, efficacy and safety.