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See where it ranks against the evidence-backed essentials in our guide to the top supplements for endurance athletes, or learn how to stack your nutrition for peak performance in our VO2 Max Supplements Guide
Unlike oral supplements that must pass through the digestive system, injectable vitamin D bypasses digestive limitations for maximum bioavailability, delivering this crucial hormone directly to your bloodstream where it can immediately support bone health, immune function, mood regulation, and countless other vital processes throughout your body
Whilst B12 plays a vital role in energy metabolism, supplementation does not promote fat loss in individuals with normal B12 levels
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