Hey Pedes. Just seeing if there is a specific brand or specific website you use for purchasing this supplement. I know that not all are equal in quality.
Thanks!
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I've used quercetin while having a bad cold. Can't say it did much. However, I don't have a recent example while not using it so I can't say for sure. Taking it regularly when you are not sick might help as well, although what I have read of Dr. Zelenko's work says low risk people don't need treatment at all, but if you want relief take quercetin, zinc, vit D3, and vit C when sick.
Edit: almost forgot. To answer your question. Sandhus Zinc + Quercetin from Amazon. Also seems to have Naturebell Quercetin on Amazon, but I have not tried it.
Dr Mercola quercetin is what I take.