You may want to read this
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418071/
“In the present work, a more soluble quercetin utilizing a delivery system based on food-grade lecithin—Quercetin Phytosome—was developed. The solubility of quercetin in that formulation was shown to be considerably higher than that of unformulated quercetin, leading to a significant improvement in quercetin bioavailability when the new formulation was administered to human volunteers in a clinical study. “