I have a really fussy mare, she won’t touch anything with oil, linseed and certainly not bute under any circumstances.
She has never had a problem eating this though, seems to actively enjoy her food more when it’s included.
I started using this as she’s an elderly TB who hates sprays and none seem “that” effective long term anyway.
She definitely has less flies around her than other horses in her field who don’t have it in their feed.
Highly recommend.