USP certified: Any OTC supplement that is USP certified will be acceptable. The USP is an independent organization which certifies identification, strength, purity, and quality of supplements. The organization verifies that Good Manufacturing Practices are followed.
Answered 12/19/2019
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D: Please go to the pharmacy and look for bottles of vitamin D. They come in either 1000 or 2000 units per bottle with 100 capsules per bottle. They are not expensive and the cost difference is small. Take one capsule at bedtime each day.
Answered 2/20/2015
3.2k views
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