Onion quercetin: As immune boosters, extraction, and effect of dehydration

Abstract Phytochemicals have gained importance in tackling viral infections and related symptoms. In this review, the role of quercetin in onions, its absorption, and metabolism have been focussed. The action mechanism of quercetin against the inflammatory responses in the human body has been discussed. Onion dehydration and its effects on phytochemicals have also been discussed. The importance of dehydration of onions and their connection with improving the health of the masses have been discussed. Onions being perishable are often wasted, causing monetary losses to farmers, traders, and the government. Making these available for public consumption in the countries deprived of onion production would help fight infections. Dehydration of onion would make onions available conveniently and economically. Studies that have used dehydrated onions for quercetin extraction have been discussed as well. This review highlights the phytochemicals essential to improving immunity and acting as immune boosters against viral infections and their fate on dehydration.