Each of these remedies offer a 99% guarantee that your strep throat will be gone within 5-7 days.
Ad ignorantiam ad nauseam
There is a logical fallacy called the argumentum ad ignorantiam or the argument from ignorance. The essence of this fallacy is that because we don't know something to be definitively false, it must therefore be true. A good example relates to concern about the dangers of electromagnetic frequencies.
When diet and exercise aren't enough...
I think this is of the most cruelly deceptive phrases in modern advertising. Firstly, no one wants to change their diet. Secondly, exercise takes time and effort and, at least at first, is quite unpleasant. Taking a pill is ridiculously easy to do. So essentially this advertising phrase applies to everyone with high blood pressure, high cholesterol, metabolic syndrome, adult-onset diabetes or other "lifestyle-related" diseases for which there are profitable pharmaceuticals (or "alternative" treatments, for that matter). It should really be "when diet and exercise don't seem appealing...".