I have bought this since it first came out as am immunocompromised. Since I have used it, despite going to often packed venues with my daughter who plays squash semi pro, shopping malls, restaurants etc . Despite this, I have had not contracted one covid virus or one cold. I did contract flu, but my husband had it and I was sleeping next to him, with him all day at home and to be fair was not using the Viraleze as I would when out and about so wouldnt expect different. I have flu vaccine so just one day of fever and aches, literally less than 24 hours. Since all this started, Most of my friends and family have contracted either covid, colds, flu or all 3 so I recommend this to all of them. As I am at risk from severe complications if contract flu or covid, this product is a total God send. Very easy to use. No interactions as far as I'm aware. Other than a minimal sting that lasts milliseconds when applied, absolutely no side effects. I really could not recommend highly enough. Thank you