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Originally Posted by tesla69
The USDA recommended dosages is based on the very minimum amount needed to keep a human alive during wartime, they were developed for WW2. So its really old research for one thing. Natural sourced vitamins are better for you - using rosehips instead of Walmart brand Vit C. Personally I like Ester-C, it lets you use a lot less but because it is more easily absorbed by the body. My doctor told me to use Vit C when ill using 1000 mg an hour until bowel intolerance is reached (ie squirts and/or gas). This always helps. I'm also a big fan of zinc lozenges for sore throats. But if you're drinking soda and eating shit it won't help you much anyway.
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all those guidelines have been redone. The USDA has redone their guidelines on RDA's (recommended daily allowances) every two years for the past decade.