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Vitamin K2: Hearts and bones

What: Compound found in real cheese and natto, the Japanese funky fermented soybeans.

Why: K2 works by activating two critical proteins – osteocalcin, which brings calcium to bones, and matrix GLA, which takes calcium out of arteries. A 2015 study found it actually improves arterial flexibility – and atherosclerosis is the No. 1 cardio killer.

Where: Supplements, most commonly bone health, menopause or cardio.