這裏一個網站似乎是美國政府有關部門的推薦：

來源: 阿明. 於 2021-04-18 12:31:37 [] [舊帖] [給我悄悄話] 閱讀數 : (3113 bytes)

Normal Results

Normal Results has been expanded.

The normal range of vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL.

https://medlineplus.gov/ency/article/003569.htm

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