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<blockquote data-quote="williams89" data-source="post: 117545" data-attributes="member: 21263"><p>For Patch</p><p></p><p>The current Recommended Daily Allowance (RDA) for vitamin C is 60 mg/day, a number originally set in 1980 and reviewed in 1989 by the Food and Nutrition Board, a part of the National Academy of Sciences. The RDA is based on the amount of vitamin C needed to prevent scurvy, a potentially fatal disease marked by fatigue and bleeding. "We need to think not just about deficiency, which has been the starting point for recommended daily allowances," Levine says, "but about a variety of other scientific factors, such as how much vitamin C is concentrated in blood and tissue when a person takes a specific amount, how much is excreted in urine, what the beneficial and adverse effects are." </p><p></p><p>When the subjects in Levine's study received 30 mg, most reported feeling tired and irritable. At 200 mg, blood plasma had more than 80 percent maximal concentration of vitamin C and tissues were completely saturated. At doses of 500 mg and higher, there was excess vitamin C that was completely excreted in urine. At 1,000 mg, some volunteers showed high levels of oxalate and uric acid in their urine, which might lead to kidney stones.</p><p></p><p>I do hope you find this useful. </p><p>BE HAPPY</p></blockquote><p></p>
[QUOTE="williams89, post: 117545, member: 21263"] For Patch The current Recommended Daily Allowance (RDA) for vitamin C is 60 mg/day, a number originally set in 1980 and reviewed in 1989 by the Food and Nutrition Board, a part of the National Academy of Sciences. The RDA is based on the amount of vitamin C needed to prevent scurvy, a potentially fatal disease marked by fatigue and bleeding. "We need to think not just about deficiency, which has been the starting point for recommended daily allowances," Levine says, "but about a variety of other scientific factors, such as how much vitamin C is concentrated in blood and tissue when a person takes a specific amount, how much is excreted in urine, what the beneficial and adverse effects are." When the subjects in Levine's study received 30 mg, most reported feeling tired and irritable. At 200 mg, blood plasma had more than 80 percent maximal concentration of vitamin C and tissues were completely saturated. At doses of 500 mg and higher, there was excess vitamin C that was completely excreted in urine. At 1,000 mg, some volunteers showed high levels of oxalate and uric acid in their urine, which might lead to kidney stones. I do hope you find this useful. BE HAPPY [/QUOTE]
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