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Vitamin D
How You May Benefit:
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Boost immune functioning
Enhance immune function by aiding the delivery and absorption of nutrients
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Maintain balanced nutrition
As a delivery system for calcium, enhance bone density and strength
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Improve joint health
Ensure optimal joint function and prevent breakdown by aiding mineral absorption
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Upregulate metabolism
Enhance thyroid function, helping the body process sugars, by supporting a healthy hormonal balance
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Avoid vital nutrient deficiencies
Inhibit muscle weakness by stimulating mineral absorption into muscles
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Improve bone health
Inhibit osteoarthritis and osteoporosis by protecting against bone/joint degeneration
Overview
Besides enhancing both immune and thyroid function, Vitamin D also delivers calcium and other vitamins and minerals to our bones, teeth, and joints. And it doesn't stop there... it also aids in the absorption and functioning of these nutrients to help ensure proper support for their on-going strength.
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Amount: 200 to 400 IU is recommended daily. For those with very little or no sun exposure, 400 to 800 IU is recommended.
Timing: Vitamin D is recommended with meals.
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Supplementation of Vitamin D is becoming more common among athletes to decrease the risk of trauma-induced arthritis. Also, athletes who fear their D levels might be low because of low fat intakes find that a supplemental form is preferred.
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Safety Information
Toxicity:
Amounts over 1,800 IU daily for extended periods may cause increased blood concentration of calcium, kidney stones, diarrhea, sore eyes, itchy skin, and unusual thirst.
Bans and Restrictions:
None reported.
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References
Chapuy, M.C., et al., "Prevalence of Vitamin D Insufficiency in an Adult Normal Population," Osteoporosis Int 7.5 (1997) : 439-43.
Dawson-Hughes, B., "Calcium and Vitamin D Nutritional Needs of Elderly Women," J Nutr 126.4S (1996) : 1165S-7S.
Lips, P., "Vitamin D Deficiency and Osteoporosis: The Role of Vitamin D Deficiency and Treatment with Vitamin D and Analogues in the Prevention of Osteoporosis-Related Fractures," Eur J Clin Invest 26.6 (1996) : 436-42.
Reid, I.R., "Therapy of Osteoporosis: Calcium, Vitamin D, and Exercise," Am J Med Sci 312.6 (1996) : 278-86.
Scragg, R., et al., "Effect of Winter Oral Vitamin D3 Supplementation on Cardiovascular Risk Factors in Elderly Adults," Eur J Clin Nutr 49.9 (1995) : 640-6.
Woods, D.R., et al., "Vitamin D Deficiency in Florida, the Sunshine State," J Fla Med Assoc 76.12 (1989) : 1035-6.
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