Don't worry, most people make the same mistake by bidding on general keywords that bring a lot of traffic and zero sales... which defeats the point.
To add another layer to what you said... ideally, you would want to bid on keywords that your potential customers would be using to buy your products. I think "discounted supplements" is still too general. Test it, though.
If the owner of the brand or the trade name allows it, try bidding on product names. For example, bid on "discounted xxx [brand name] protein shake". While such keywords will not bring you a ton of traffic, they will bring you targeted traffic that are likely make a purchase.
Think about this... If you were a customer, what would you type if you are searching for a specific product to buy?
Let me know if you want me to clarify/elaborate.
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