Do you need ‘personalized sunlight’? New device boosts vitamin D —without going outside

Wellness Do you need ‘personalized sunlight’? New device boosts vitamin D —without going outside By Allie Yang Published July 9, 2026, 6:29 a.m. ET See more of our coverage in your search results. Add The New York Post on Google Too many people are earning an F on their vitamin D. A study published in Nutrition Research found that 41.6% of American adults are deficient in it, and that number climbs even higher for certain groups — 82.1% for Black people, 69.2% for Hispanics. Vitamin D is essential for your body to function, and not getting enough of it can cause fatigue, mood issues like depression or anxiety, and impaired immunity. Long term, you’re looking at problems with bone health, muscle function and susceptibility to chronic diseases.

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