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Supports Immune Function: Vitamin D3 contributes to the normal function of the immune system, helping support your body through consistent training and everyday demands Supports Bones & Muscle Function: Vitamin D3 contributes to the maintenance of normal bones and normal muscle function, making it a useful daily addition for active individuals Supports Muscle Health: Vitamin D3 also contributes to the maintenance of normal muscle function, an important factor for anyone training regularly or staying active day to day Convenient Tablet Format: Simple to take as part of a daily routine, with 90 tablets supplied per pack You can’t Beat the Science: Every SiS product is driven by research, developed with elite athletes, and tested with precision to deliver reliable, evidence-based performance nutrition for athletes at every level