I know all that. In fact I woke up sick two days ago, not very, but knew I was on the verge, and I did that. Also one zinc (23 mg) with quercetin. All symptoms gone by noon. However, many people just won't take a horse medicine or can't figure out the marks on the plunger. They are a little hard to see. If they can't manage that, gummies, patches, or niacin would be safer. BTW the farm store now has a sign up "IVERMECTIN HORSE PASTE IS NOT FOR HUMANS" so obviously there is a run on it. Amazon's price has gone up too.