I mix quercetin with collagen and can feel it in my hips when I miss a day, so I know it works. Good quality. It has a pleasing taste and is therefore easy to consume. A good way for me to consume these nutrients. I’m on my third month of using it, and if I have discomfort in my knee in the afternoon, I take another capsule, which relieves the pain within 20 minutes. I will continue to purchase this product and tell my friends about it. Quercetin has antioxidant and anti-inflammatory help reduce swelling, prevent premature ageing, and improve skin suppleness and moisture.