[ahimel]

Is switching jobs feasible?

There are a lot of really good products out there. If you know who makes the best supplements, go see if they're hiring. I guarantee if they ask, "Why do you want to work here?" and you say, "Your products are the best, and I didn't want to sell anything but the best" they'll hire you.

If you're tired of supplements, pick another field. Pick something you like, and think of the brand name that you'd most like to buy -- sell that. Sell Bose speakers or Capezio dance shoes.

If you only sell the best, then "Is this the best product?" is never a scary question.

Additional possibility that just occured to me: check the price. If you're selling Dell computers, and a customer asks you, "is this the best computer I can get?" you can honestly reply, "No, Sony is better. But Sony will charge you twice as much, and they're not twice as good. This is the best value for your dollar." People will still appreciate your honesty, and you'll still make the sale most of the time.