Vitamin D3 is made in your skin when you’re exposed to ultraviolet-B (UVB) radiation from sunlight. But bad weather and the use of a sunblock can limit your ability to produce enough vitamin D for all your health needs.
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Vitamin D3 is made in your skin when you’re exposed to ultraviolet-B (UVB) radiation from sunlight. But bad weather and the use of a sunblock can limit your ability to produce enough vitamin D for all your health needs.