There are now (at min) 4 big systematic meta-analyses of vitamin D & Covid since Dec'21.
3 study D levels & 2 supplementation. Newest both.
Strong, consistent, & highly statistically significant results:
Low D raises & supplementation lowers all stages of Covid risk by ~1.5-3x
🧵 pic.twitter.com/sODKnrOUq5

— Karl Pfleger (@KarlPfleger) August 11, 2022