Personally, I really liked that Colloidal Silver. I podastovala of kits all spray bottles have washed them, poured silver (Diluted with water), put it in the bag herself and her husband. Always used for prevention in public places. Virtually no ill this fall and winter. Economical use for 7 months, very active, and more 1/4 bottle left. If my review was useful to you please click "YES".