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Dr. Mercola’s Weekly Quiz


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1 What vitamin decreases vitamin D toxicity, including helping to remove calcium from your blood vessels and deposit it into your bones?

  • Vitamin E
  • Vitamin A
  • Vitamin K2

    Vitamin K2 works synergistically with calcium, magnesium and vitamin D to impart a number of important health benefits. Learn more.

  • Vitamin K1


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