D3

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Generally, less than 20% of the body's vitamin D needs come from diet. The rest comes from sun exposure, when the skin converts 7-dehydrocholesterol into vitamin D. That means anyo ne who limits their time in the sun — or trains, works and lives mostly indoors — tends to run low. WHAT VITAMIN D SUPPORTS Beyond being essential for calcium absorption and metabolism, adequate vitamin D status supports: Normal immune function Muscle function Muscle recovery Adaptation to training HORMONAL HEALTH Maintaining adequate vitamin D status also supports healthy hormone levels in both men and women, including: Healthy testosterone levels Healthy estrogen levels 2,000 IU IN EVERY CAPSULE Each capsule of HD Muscle D3 contains 2,000 IU (50 mcg) of high-potency vitamin D3 — the same form your skin makes from sunlight, and the form that raises vitamin D levels more effectively than D2. Show more