I kind of made the recipe up myself. I put in stuff I thought was good for the scalp. I heard rosewater was a good moisturizer so I picked some up from an organic store. I already had vit E oil and tea tree oil so I put a little of those in.
My sulfur mix was an attempt at replicating BT (boundless tresses) which is made up of yellow sulfur, coconut oil, and EVOO. I made mine with just the sulfur and EVOO. I have to put as a disclaimer be careful if you handle/use the sulfur because a lot of people have an adverse reaction to sulfur
ETA for dry scalp you could try "greasing" your scalp with castor oil, coconut oil, or EVOO. For the hair I would suggest deep conditioning at least once a week with a moisture DC