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Honest writing on supplements, biology and high-performance living. New article every two weeks.

Vitamin D3 and K2: The Synergy Your Bones, Heart, and Immune System Desperately Need

Taking vitamin D without vitamin K2 is like hiring a delivery driver who drops packages at random houses. The calcium gets mobilized but without...

The sun is finally back — and millions of people are about to make the same mistake they make every spring: they’ll stop taking...

You've probably been told to take vitamin D for bone health. What you haven't been told is that vitamin D alone is incomplete it's...