Magnesium, zinc, copper, manganese, vitamin K, boron, strontium, silicon, folic acid, vitamin B6, vitamin B12, phosphorus, and vitamin C have all been shown to play a role in bone health. Following is a brief description of the role that each of these 15 nutrients plays in building healthy bones.
Calcium: A component of the mineral crystals that make up bone.
Vitamin D: Enhances calcium absorption, prevents falls by improving nerve and muscle function.
Magnesium: Important for bone mineralization (accumulation of minerals which form bones). Magnesium deficiency is associated with abnormal bone mineral crystals in humans. In an open clinical trial, magnesium supplementation increased bone mineral density by an average of 5% after 1-2 years in postmenopausal women.
Copper: Laboratory research has found that copper promotes bone mineralization and decreases bone loss, and that osteoporosis can develop if the diet is deficient in copper. Western diets often contain less copper than the amount recommended by the National Academy of Sciences. In a 2-year double-blind trial, copper supplementation reduced bone loss by 90% in middle-aged women, compared with a placebo.
Zinc: Like magnesium, zinc is important for bone mineralization, and also has been shown to decrease bone loss. Low dietary zinc intake was associated with increased fracture risk in a study of middle-aged and elderly men. The zinc content of the diet is frequently low; a study of elderly low-income people found they were consuming only half the Recommended Dietary Allowance for this mineral.
Manganese: Plays a role in the creation of the connective-tissue components of bone. Manganese deficiency in laboratory tests resulted in low bone mineral density and weak bones. Manganese deficiency may be associated with the development of osteoporosis.
Boron: Supports creation of bone protecting hormones such as estrogen, testosterone, and DHEA. Boron supplementation prevented bone loss in experimental studies. In human volunteers consuming a low-boron diet, boron supplementation decreased urinary calcium excretion by 25-33%, a change that may indicate reduced bone loss.
Silicon: Plays a role in the synthesis of the connective-tissue components of bone. Silicon deficiency has been associated with bone abnormalities. In an observational study, higher dietary silicon intake correlated with higher bone mineral density. In a clinical trial, administration of an organic silicon compound increased bone mineral density of the femur (or thigh bone) in postmenopausal women.
B vitamins (folic acid, vitamin B6, and vitamin B12): These three B vitamins have been shown to lower blood levels of homocysteine, a breakdown product of the amino acid methionine. An elevated homocysteine concentration is a strong and independent risk factor for fractures in older men and women. Homocysteine levels increase around the time of menopause, which may explain in part why bone loss accelerates at that time. In a 2-year double-blind trial, supplementation of elderly stroke patients with folic acid and vitamin B12 reduced the number of hip fractures by 78%, compared with a placebo.
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