offers as a premise a claim that merely paraphrases the conclusion and for which no support is provided takes a condition that is sufficient for the conclusion to be true as one that is necessary for the conclusion to be true relies on the claims of an authority on a topic outside that authority's area of expertise infers that some claims are inaccurate solely on the basis of the source of those claims
Salespeople always steer customers toward products from which they make their highest commissions, and all salespeople in major health stores work on commission. Hence, when you buy vitamin supplements in a major health store, you can be sure that the claims the salespeople make about the quality of the products are inaccurate.
The reasoning in the argument is flawed in that the argument