After reading this question, I went and tried it; and, while it worked, I can't find a use for them. I can't sell them at the Item Check, and I tried poring them out, and it makes a yellow dust, but I don't know what that does.

I did the one quest after completing the third dungeon where

That one lady needs them to heal her Loftwing,

but

her brother gives you some with a free bottle, and as far as I know, my Loftwing can't get hurt.

What is their use?