Vitamin D3, Not D2, Is Key to Improving Vitamin D Levels

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Vitamin D3, Not D2, Is Key to Improving Vitamin D Levels

Vitamin D3 is significantly more effective at raising the serum biological marker of vitamin D status than vitamin D2 when given at standard doses in everyday food and drink, say UK researchers — findings that could have major implications for both current guidelines and the supplement industry.
In a randomized controlled trial of vitamin D supplements, vitamin D3, which is derived from animal products, was associated with significantly higher serum total 25-hydroxyvitamin D [25(OH)D] levels after 12 weeks than vitamin D2, which is plant-based and currently used in the vast majority of vitamin D supplements.
The research was published online July 5 in the American Journal of Clinical Nutrition.

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