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, which was 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.
Vitamin D, also known as the “sunshine vitamin” is an essential vitamin that plays many important roles in the
proper functioning of the body. Though classified as a vitamin, vitamin D is actually a key regulatory hormone
for multiple physiological processes. It is estimated that 1 billion people, including the elderly, young adults,
athletes and children, are vitamin D deficient or insufficient. The main cause of vitamin D deficiency in the
athletic population is the direct result of decreased ultraviolet B (UVB) radiation absorption into the skin, which
especially affects indoor athletes and those who live and train in northern latitudes.
Adequate vitamin D status is essential for ensuring normal calcium absorption and maintenance of healthy
plasma calcium levels.†
Besides bone support, vitamin D has many other roles in the body, including
modulation of cell growth, neuromuscular and immune function, and inflammatory support. †
has shown there is a positive association between Vitamin D 25(OH)D serum concentrations, lower extremity
function, proximal muscle strength and physical performance. Vitamin D deficiency is associated with diffuse
muscle pain, muscle weakness predominantly in the proximal muscle groups, and a reduction in performance
A serum 25-hydroxyvitamin D level below 50 nmol/l has been associated with increased body sway
and a level below 30 nmol/l with decreased muscle strength. Based on the study by Barker et al, pre-exercise
serum 25(OH)D concentrations could influence the recovery of skeletal muscle strength after an acute bout of
Numerous scientists now feel that supplementation with vitamin D at levels greater than previously thought
necessary is critical to helping maintain healthy bone remodeling and healthy vitamin D plasma levels.†
A committee of the Institute of Medicine reviewed the data on vitamin D needs and concluded that persons are
at risk of vitamin D deficiency at serum 25(OH)D concentrations <30 nmol/L (<12 ng/mL), and practically all
people are sufficient at levels ≥50 nmol/L (≥20 ng/mL). Vitamin D is fat-soluble, so it should be taken with
foods containing fat to aid in absorption through the small intestine.
Vitamin D intoxication is extremely rare.
Doses of 10,000 IU of vitamin D3 per day for up to 5 months did not cause toxicity. The latest United States
recommended dietary allowance (RDA) for vitamin D is 600 IU per day. However, dietary intake may vary for
athletes based on diet and intestinal absorption and the amount of sunlight exposure, thereby requiring higher
KLEAN-D may be a useful dietary supplement for athletes desiring healthy vitamin D levels.