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This high-potency supplement contains 125 mcg, or 5,000 IU of vitamin D3 in each serving. As a bonus, this product has been third-party tested for potency and purity. This article looks at how much ...

June 24, 2026 A study of nearly 300 people across northern Britain found that vitamin D levels often stay low all year in groups most at risk. Surprisingly, summer sunshine did not significantly boost ...