There main difference would be their source.
Castor oil is a fixed oil expressed from the seeds of Ricinus communis (family Euphorbiaceae); a purgative.
Mineral oil is a mixture of liquid hydrocarbons obtained from petroleum, used as a vehicle in pharmaceutical preparations; occasionally used as an intestinal lubricant; can interfere with absorption of fat-soluble vitamins.
Synonym(s): heavy liquid petrolatum, liquid paraffin, liquid petroleum
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