Klean-D contains 25 mcg (1,000 IU) of vitamin D3 per tablet as targeted support for athletes who train indoors or receive limited exposure to natural sunlight. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. | Athletes need to train, no matter what: rain or shine, early mornings, late evenings, sore muscles, or low energy. Vitamin D may help to improve the quality, frequency and duration of training, and contribute to faster muscle recovery. Klean-D contains natural vitamin D3, providing targeted support for athletes who train indoors or receive limited exposure to natural sunlight. Vitamin D supplementation may also help support athletes immune health, musculoskeletal strength and physical performance. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.