[grey_whiskers]

Back away from the keyboard, slowly. No flames. But the little bit I skimmed, suggested a correlation between Vitamin D metabolism and this substance; and a couple other nifty correlations --> such that, if you have enough of this marker, COVID won't be a threat to your health.

(Not yet investigated, if high levels ALSO keep you from shedding virus. Which is where it would get interdasting.)

[LilFarmer]

If vitamin D increases Sphingosine, the next question I would have, is do the vaccines deplete it