I’ve been taking vitamin D to ward off winter blues, but I’m still struggling. What else do you recommend?

In addition to the vitamin D, you may need to supplement with vitamin K—a vital nutrient that, in my clinical experience, 80 percent of women don’t get enough of. That’s a problem because vitamin K acts as a cofactor in many of D’s health-promoting processes. Without adequate levels of both of these vitamins, D becomes unable to complete functions like activating key hormone receptors, ferrying calcium into bones and dialing down inflammation.

To get all the perks of vitamin D—including sunnier moods, speedier metabolism, reduced appetite and stronger bones—take 45 mcg of vitamin K with your daily dose of D. You should notice improvements in your mood and energy levels within days.

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