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There are many brands of Vitamin D on the shelf and the price difference among the same strength is very large. Is a "plain" Vitamin D3 sold under the Walgreen's brand as good as a product 3X the cost made by another company? Nothing on the bottles leads one to believe any one product is necessarily better than another, so……????? Has anyone produced reliable testing of these products for purity, safety, stength, etc?

Asked by  getmetz93786500 on July 14, 2015

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