D3 is active form: D3 is the active form of vitamin d and is the only form anyone should take. Vit d works in synergy with vit a and k; these can be obtained from diet but can also be supplemented. Most adults need 5-8000 iu of d3/day to achieve optimal levels of 50-80. See http://bit.Ly/1gnxnk0 ; http://bit.Ly/1d6mkhq ; http://bit.Ly/1fnt3ox.
Answered 3/3/2014
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