Source Naturals Vitamin D-3, 400 Capsules
400 capsules · Capsules
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Price history
Best price so far: £20.65 at Iherb on 2 Sept 2026
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About this product
Dietary SupplementBioactive Form For Bone and Immune HealthSunlight is the source of life on Earth, but we may not be aware of all the ways it benefits us. Our bodies manufacture vitamin D-3 when the skin is exposed to UV radiation from sunlight, but the ability to do so decreases as we age. Vitamin D-3 maintains healthy calcium and phosphorus levels in the body for strong bones, it helps maintain muscle strength in older adults, and it also plays an active role in a healthy immune response. Vitamin D-3 (cholecalciferol) is the optimal form of vitamin D. It is the form of vitamin D that the body manufactures in sunlight, and the form most efficient for the body's needs.