500 mg Quercetin Dihydrate With Mct Oil and Sunflower Lecithin Soy-Free Dietary Supplement Quality Matters: Igen - Non-gmo Tested Gluten-Free Third-Party Tested cGMP Compliant Sports Research quercetin supplement supports antioxidant activity and seasonal immune system function. Just one (1) of our softgels provide 500 mg of quercetin, promoting antioxidant activity and an immunity health support. This quercetin supplement helps support the cardiovascular system and provides heart health support. Quercetin is a polyphenolic bioflavonoid and our Quercetin capsules are the most bioavailable form there is. It s sourced from Brazilian fava trees, then formulated with Coconut Mct Oil and Sunflower Lecithin to help aid with absorption. It is also standardized to 95% quercetin powder in the dihydrate form.