Vitamin D3 is available through diet, supplements and exposure of the skin to sunlight, or ultraviolet B (UV .

维生素D3可以通过饮食，额外补充及将皮肤暴露在阳光或者紫外线B（UV）下获得。

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The body gets most of its vitamin D not from diet but from skin exposed to the ultraviolet B radiation in sunlight.

身体获取的大部分维他命D不是从饮食而是靠皮肤曝露在阳光中的紫外线B射线取得的。

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Objective To observe the effect and the safety of narrow-band ultraviolet B(NB-UVB) in the treatment of psoriasis vulgaris.

目的观察窄谱中波紫外线（NB-UVB）治疗寻常型银屑病的疗效及安全性。

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But a product's SPF indicates only its ability to defend against sunburn-causing ultraviolet-B rays and not against ultraviolet-A, which penetrate deeper into the skin and cause premature aging. (Both types contribute to skin cancer.) For example, a person wearing SPF 50 could spend considerable time in the sun without getting burned.

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In it, he uses eye drops made of a special riboflavin (a type of vitamin B) formulation and a very weak ultraviolet light to strengthen the collagen fibers in the eye.

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