See my post: Vitamin D? Crucial to Your Health
Vitamin D3 is essential for a healthy immune system. Recent studies have also shown “The results of the present study suggest that prescription of vitamin D supplement in the first trimester of pregnancy contributes to preventing recurrence of preeclampsia. In regards to effects of vitamin D on preeclampsia, evidence suggests that vitamin D metabolism is associated with preeclampsia.”
4000IU also shown to prevent gestational diabetes. And Research has shown a huge difference in people who had asymptomatic Covid-19 and those who ended up in the ICU. 96.82% of patients admitted to the ICU for Covid-19 were deficient in vitamin D and had a greater mortality rate.