Table 1: Classification of vitamin D level (serum 25(OH)D levels).
|
Classification |
Nanograms |
Nanomoles |
Recommended D |
|
Danger of toxicity |
> 100 ng/ml/l* |
> 250 nmol/l |
|
|
Normal or optimal |
> 30 ng/ml |
> 75 nmol/l |
400-4000 IU/day |
|
Insufficient |
21-29 ng/ml |
51-74 nmol/l |
4000-6000 IU/day |
|
Deficient |
11-20 ng/ml |
26-50 nmol/l |
7000 IU/day |
|
Severely deficient (often not distinguished from deficient) |
< 10 ng/ml |
25 nmol/l |
10000 IU/day × 1 month or 500,000 IU × 1 |
*Some sources found that 150 ng/ml was not harmful. I μg Vitamin D = 40 International Units (IU).
Adapted from: Benskin, 2020.