Why did the girl at Whole Foods not recommend it? I have taken it on/off for about 8 months or so with no problems. I researched it pretty thoroughly and found no negative information regarding it. I take it when I feel an infection coming on and continue for about a week or so after, shortening the dosage as I go. It has worked wonders for me! It sure beats going to the doctor and taking antibotics :) I'm not at all familar with the silver . . . I'll have to look into that as well.