I was just thinking about the supplemental feeds that we feed our bees, in particular I've been wondering about what contaminants might be in the ingredients.

Some of the ingredients we use to feed our honey bees:

Soybean flour -->
soybean seeds are treated with neonicotinoid insecticides

Brewers Yeast -->
hops and barley are both treated with neonicotinoid insecticides

Vegetable Oil -->
canola, sunflower, corn, and most other crops grown for their oils are treated with neonicotinoid insecticides

Sugar (Sucrose and HFCS) -->
neonicotinoid insecticides are used on corn, sugar beets, and even sugar cane.

Maybe neonicotinoid insecticides are practically harmless to humans when we ingest it in our food, but aren't honey bees supposed to be sensitive to even very minute quantities of these insecticides?

How do I know that I'm not poisoning my bees when I attempt to improve their diet?

Is there any way to know if any of these or other poisons are in the food we feed our bees?