According to author Kathi Keville, if your recipe is for a treatment or shampoo, you'd add 30 drops of EO per 2 ozs. of an unscented shampoo base or carrier. So your 50 drops in 8 ozs. is not excessive, and you can actually experiment and add more if you like. Her Scalp Treatment Oil for Dandruff for example, has 2 tbsp. of jojoba, ½ tsp. of carrot seed oil, with 22 drops of various EOs. HTH...