I thought I had put some essential oils in this, MMMM I guess I forgot. He does talk teach class that I went to. it is about a 5 hour drive for me but well with ever min. he teaches other class about the use of essential oils to keep mite and SHB out of your hive. IT REALLY DOES WORK 
a class I took from Ken Davis.
Looking back at my notes, it looks like I additionally added some essential oils that are a basically in honeybee healthy. Little bit of Wintergreen and spearmint.
Taking a little bit of what I would normally feed the bees for spring and fall with essential oils is what I would mix in this as well. I will look for those videos from Ken as well.
With essential oils remember less is more
more of the same just a few years back