Not All Vitamins Are Created Equal: Why Your Supplements Might Be Failing You

7. Nutrient Synergy and Interaction
Some vitamins require the presence of other substances for better absorption. For example, Vitamin D3 without the presence of Vitamin K2 may lead to calcium deposits in the arteries, or iron is absorbed much better alongside Vitamin C. Professional brands respect these synergies in their formulations. Always check if your supplement includes the necessary co-factors for maximum absorption.