Vitamin D Deficiency Persists in Summer: Surprising Barriers to Getting Enough

TL;DR
Vitamin D deficiency affects around 60% of people worldwide, even in summer, due to a mix of dietary gaps, limited UVB exposure, aging skin, darker skin tones, and certain medical conditions or medications; experts suggest considering vitamin D3 supplements (often 1,000–2,000 IU daily) under a doctor’s guidance, while being mindful that too much vitamin D can affect kidneys and calcium levels, and that sunscreen and pollution can reduce sun-driven production.
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