Levels of 50 nmol/L (20 ng/mL) or above are adequate for most people for bone and overall health. Levels below 30 nmol/L (12 ng/mL) are too low and might weaken your bones and affect your health. Levels above 125 nmol/L (50 ng/mL) are too high and might cause health problems.
https://www.drhenrywu.com/vitamin-d/
根據上述各個研究提出的理想值，對於一般沒有特殊疾病的成人而言，我建議可以以25(OH)D的值50ng/mL為目標
https://ods.od.nih.gov/factsheets/VitaminD-Consumer/#:~:text=Levels%20of%2050%20nmol%2FL,and%20might%20cause%20health%20problems.
How much vitamin D do I need?
Levels of 50 nmol/L (20 ng/mL) or above are adequate for most people for bone and overall health. Levels below 30 nmol/L (12 ng/mL) are too low and might weaken your bones and affect your health. Levels above 125 nmol/L (50 ng/mL) are too high and might cause health problems.高原实在是硬伤。 出门晒太阳，晒了就伤， 涂防晒哪怕是15， 都晒不够。
最好的是回北京， 除非夏天我都不涂防晒， 回来测就不错， 不用吃Vd。