Research on CCD can really take off when all beekeepers get involved and volunteer their hives for studies??
beekeepers are involved. what beekeepers are finding on things like CCD, mite, etc. does not always fit the political narrative. there is a long history of CCD like occurrences, but they are rarely mentioned because a history would not fit the political narrative.
something is always dying and man is always killing it. if you can prove that the same thing happened before man had the tools/chemicals to kill it, please don't mention that. it messes things up.
HBH is spearmint oil, Lemongrass oil and lecithin as an emulsifier. you can mix your own for a fraction of the cost if you want to feed essential oils. if you want to have the convenience of the mix, buy it. if you don't think essential oils are good for your bees, don't use it.
i don't see the benefit because i have never had a hive with problems feeding. the benefit of essential oils in feed is questionable and as some have posted, there is some indication that it may actually be harmful.
like everything else you do, it's cost/benefit and personal preference.