Sentence:  Oil that is not suitable for use as <WSD>carrier oil</WSD> is baby oil or mineral oil, which is a petrolatum product and essential oils do not disperse well into these products nor do they sufficiently penetrate the skin, which disallows the aroma's molecules entry into the bloodstream. 
Meaning of the word marked with <WSD> tags:  An oil that is easily absorbed by the skin that is used to dilute an essential oil for use in cosmetics, massage or aromatherapy.