KLEAN-D™ by Klean Athlete® contains 5,000 I.U. of natural vitamin D3 per tablet. Vitamin D supplementation may help support immunity, musculoskeletal strength and physical performance in athletes.

KLEAN-D™ is tested and certified by the NSF Certified for Sport® Program, created to meet the growing demands of athletes, coaches and healthcare professionals to certify that sports supplements are safe and completely free from banned substances. Every product that carries the NSF® for Sport mark has undergone stringent laboratory testing to confirm content, purity and compliance.