Vitamin D is mainly problematic when low or insufficient, as is the case with many other nutrients. 40-60 ng/mL 25(OH)D is a commonly preferred range. It can ha

Vitamin D is mainly problematic when low or insufficient, as is the case with many other nutrients. 40-60 ng/mL 25(OH)D is a commonly preferred range. It can have positive effects at higher serum levels (>70 ng/mL, with >90 ng/mL being even better) when trying to heal.