The Food and Drug Administration has caught producers adding corn syrup, cane sugar or beet sugar to honey to bring down the cost.
Consumer Reports tested salmon labeled "wild caught" and found 13 were actually farm raised.
And some olive oils could actually be soybean oil, which is not as healthy.
"If a product like a pure maple syrup or honey is priced so low, that the differential is so different than other similar competing brands, then you probably should be suspicious," Center for Science in the Public Interest spokesperson Bruce Silverglade said.
The experts say name brand items have more quality control and less likely to be counterfeit.
