Hard to know: If you have had a deficiency of one of these vitamins or minerals, your symptoms should gradually improve- hair/nails will take a while because of slow growth. If taking for general health, it is certainly tricky to know because the goal is to not develop a condition. So, if you don't develop a condition, is it because the supplement helped or if you wouldn't have got it anyway. Good luck!
Answered 2/7/2018
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