Phytonutrients aren't considered essential nutrients so there is no recommended daily amount you should have. This is because you can’t get a disease from a phytonutrient deficiency. That being said you should still definitely make sure you are getting a good amount in your diet each day as they are great at preventing and reversing some diseases/disorders.

The benefits of Quercetin range from acting as an antihistamine fighting inflammation in the body, reducing LDL cholesterol levels, reducing blood glucose levels (great for diabetics) and being an excellent antioxidant combating the free radicals in our bodies.

To get this benefits we need to be having between 200mg - 500mg of Quercetin a day. From the table below you can see that Capers, Lovage Leaves and Dock Leaves provide the highest amount per 100g. Whilst i always advise getting your nutrients/phytonutrients from food first this where a FSC Phytonutrient Quercetin supplement comes in handy as each capsule contains 200mg. By using this supplement you are guaranteeing that you get an adequate amount of this amazing phytonutrient everyday.

Research

http://www.phytochemicals.info/phytochemicals/quercetin.php

https://juicing-for-health.com/phytochemical-phytonutrient

http://www.quercetin.com/overview/food-chart