| Item | Cas No. | Appearance | Moisture | Source of plant | Function |
| Dihydrate quercetin | 6151-25-3 | yellow | 8%~12% | Sohpora Japonica bud | antioxidant properties may help reduce inflammation, allergy symptoms, and blood pressure |
| Anhydrous quercetin | 117-39-5 | yellow | <4% | Sohpora Japonica bud | Same with quercetin dihydrate |
| Isoquercetin | 482-35-9/21637-25-2 | yellow | <7% | Sohpora Japonica bud | Isoquercitrin has higher bioavailability than quercetin and displays a number of chemoprotective effects both in vitro and in vivo, against oxidative stress, cancer, cardiovascular disorders, diabetes and allergic reactions |
| Dihydroquercetin | 480-18-2 | Light yellow or off-white | <5% | Larch orengelhardtia roxburghiana | more powerful antioxidant,help you maintain a healthy heart, healthy circulation, and healthy immune defense. |
Quercetin is a type of flavonoid present in many fruits,vegetables,and grains.Such as red wine,onions,green tea,apples,berries,buckwheat and so on.In fact,we get the quercetin from the plant Sohpora Japonica bud.At first,we get the bud and extract rutin,then hydrolyze rutin get quercetin and L-rhamnose.From the material to quercetin,the extract ratio is about 10:1,that mean,10kg material sophora japonica bud can get 1kg quercetin 95%.So if you buy quercetin,you can understand the quality and the price.
Studies to date show that quercetin is an effective treatment for COVID-19. Statistically significant improvements are seen for ICU admission, hospitalization, recovery, cases, and viral clearance. 10 studies from 8 independent teams in 7 different countries show statistically significant improvements in isolation (3 for the most serious outcome). Meta analysis using the most serious outcome reported shows 49% [21 68%] improvement. Studies typically use advanced formulations for greatly improved bioavailability.
Cheema present another meta analysis for quercetin, showing significant improvements for ICU admission and hospitalization.
For the full list of studies,please check out https://c19early.org/