Quercetin is a plant pigment, or flavonoid, that is found in plants including onions, apples, berries and also in red wine. At Natures Aid, our unique formula combines quercetin with the synergistic nutrients including Vitamins C and B5. Our carefully selected ingredients provide 250 mg of Quercetin per daily dose of 2 capsules with the addition of Vitamin C which is included to support the normal functioning of the immune system and the reduction of tiredness & fatigue. The formula also includes 100mg of Vitamin B5 to contribute to the normal synthesis of steroid hormones plus natural sulphur as 250mg of MSM, 50mg of Pine Bark extract and liquorice root equivalent to 250mg.