The only true way to know is ask the person you are buying it from if it is cut with anything and see what they say. Maybe the manufacturer would go by the essence or oil difference but distributors after that may not. Mine is labeled as Shellfish Oil and it is most definitely not cut with anything. It is the 100% synthetic product that does not fade in strength. JR ,myself, Bob and Paul I would guarantee do not sell cut products that's why I say buy from a lure maker if you want to be sure of your ingredients