I had been taking another brand of Vitamin D, but after changing to Natural Factors, my levels improved into the normal range for the first time in several years.
I will keep using this product!
Heart problems run in my family, so I will continue to use this product. Natural Factors gets great reviews. I've used it for at least 3 years now.
This has been a very helpful supplement for me. I take one a day, and when needed I can increase to two a day.
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