A recent study suggests that vitamin D levels above 36 nanograms/milliliter are associated with a small risk of death or cardiovascular events, and levels below 20 ng/ml are associated with a major risk. However, some researchers believe the risk seen with higher levels was affected by already unhealthy participants' tendency to use greater amounts of vitamin D, John Cannell writes. "Until a randomized controlled trial shows high dose supplementation is dangerous, I will maintain natural vitamin D levels."

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Vitamin D Council

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