Local honey is supposed to have a benefit of helping your body deal with allergens as well.

That’s because it contains small amounts of the pollen you might be allergic to. So it’s really important that it’s raw, because you don’t want to cook the proteins that the pollen is made of.

Why do you not want to cook the proteins? Does it break them down to uselessness, or do the become harmful?

Heat changes the protein structure, so antibodies might no longer recognize them: https://pubmed.ncbi.nlm.nih.gov/9826012/

FWIW, that's been thoroughly debunked. For the vast majority of people who suffer from seasonal allergies, they are not allergic to the same plants that bees pollinate.

It’s probably true that most seasonal allergies are cause by wind-pollinated plants, but bees sometimes help to pollinate those kinds of plants if they happen to be the closest food source. I have ash trees (Fraxinus) in my neighborhood, and even though they’re primarily wind-pollinated, I always see lots of bees gathering their pollen in the springtime. But bees would probably prefer flowers with more nectar if they’re available.