Vitamin D Reference Range For Optimal Immune Health. In this video I discuss the ideal vitamin D reference range for optimal immune system health. I discuss both the lab reference range and the optimal reference range. This information will be especially important for those with autoimmune conditions, but of course will benefit ANYONE looking to have a healthy immune system.
If you live in the United States and want to purchase your own blood tests you can use the following service:
Here is a good quality vitamin D3/K2 supplement:
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