I used iMask protocol for prophylaxis and did not catch delta. I used the early treatment protocol after catching the thing called omicron. Hard to say what that did because omicron was so weak. I like the idea because it is supposed to slow cell infection down allowing your immune cells to devour it faster than it can sicken you. A good concept if it actually does that. I will keep some now, but I think I have that immune imprint now and will just act natural from here on.