Sorry, wrong forum. I meant to post that message is this forum:
I've done some study and have found supplements can be very dangerous or harmful depending on the dosage. Yet having a glass of Real Fresh Orange Juice everyday isn't harmful. Among other benefits besides getting some "Quercetin"... Orange Juice will help to increase natural Interferon production in your body because of the active Vitamin C.
Of course, if you drank 5-6 glasses then you'd probably feel sick... that would be overdoing it, yet one glass or half a glass everyday is an excellent way to get vital nutrients, enzymes, vitamins, minerals, etc., especially for someone with a compromised immune system. Juicing allows the body to absorb the vital nutrients, enzymes, etc., more easily directly through the blood stream without having to be digested. All the healing substances get delivered straight to the Liver and filter through helping to heal damage.
Maybe you could try freshly made Orange Juice instead of "Quercetin pills" and see how that helps? Just a friendly suggestion. My whole family loves Real Orange Juice freshly made with a juice machine. Tastes nothing like store bought orange juice. I always cut the orange part off with a knife leaving on all that white pulp we normally try to remove when we eat an orange... then the drink tastes more creamy and adds much more nutritional value.
This is a very gentle way of delivering vital nutrients throughout the body, whereas vitamin pills are not so gentle and can cause harm. I think we can trust nature to provide the correct dose of "Quercetin" our bodies need when we eat an Orange, or drink some freshly made orange juice.