Vitamin D was discovered by American researcher Elmer McCollum.
British doctor Edward Mellanby attempted to discover if vitamin deficiency was the cause of rickets by feeding laboratory dogs a diet that consisted of only oatmeal and keeping the dogs indoors (out of the sun). The dogs developed rickets. Mellanby then fed the dogs cod liver oil and cured the rickets. Mellanby wrongly concluded that a deficiency of vitamin A caused rickets.
American researcher McCollum, co-discoverer of Vitamin A, repeated the experiment, but fed the dogs cod liver oil that had been treated to destroy the vitamin A content. The modified cod liver oil still cured the dogs, so McCollum concluded that it was some new vitamin, which he called vitamin D.
Exposure to UV light causes mammals to produce vitamin D. Wisconsin researchers in the early 1900s discovered that exposing food to UV light will create a previtamin that the body converts to vitamin D. In 1924 bread and milk were irradiated with UV light throughout the U.S., a practice that continued until researchers discovered how to create vitamin D in the lab, leading to fortification of milk with synthetic vitamin D.
IMPORTANCE: Improves absorption and utilization of Calcium and Phosphorous; required for bone and teeth formation; maintains a stable nervous system and normal heart action.
DEFICIENCY SYMPTOMS: May lead to rickets, tooth decay, softening of bones, improper healing of fractures, lack of vigor, muscular weakness, inadequate absorption of calcium, retention of phosphorous in the kidneys.
External skin care: Vitamin D in Great Skin Firming Night Cream: Works by increasing your skins vitality and sealing in moisture. With collagen to restore elasticity and Vitamin E for healing. Deeply penetrates to prevent excess dryness. With sesame oil, olive oil, apricot kernel oil, jojoba oil, avocado oil, squalene, kakui nut oil, aloe vera, Vitamin E, lemon balm, comfrey, sage, marigold, marsh mallow, teaberry, jasmine, cucumber, Vitamin A, and Vitmin D. Firming night cream is a heavy moisturizer that deeply penetrates the skin and will prevent excess dryness. This therapeutic vitamin and moisturizing treatment increases the skins vitality and seals in the moisture, augmenting skins resilience. Contains collagen which restores elasticity, and vitamin E which helps in healing the skin. Nourishes the skin as it firms. Apply before bedtime after cleansing and toning. Great Skin Firming Night Cream
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