Cancer chemoprotective compositions containing reduced oil-content
extraction meals made from plants containing natural oils and
glucosinolates. The oil content of the extraction meals may be reduced
using batchwise or continuous supercritical fluid extractions. Also
provided are glucosinolate-rich compositions containing purified
glucosinolates isolated from plant materials. The glucosinolate-rich
compositions may be made by reducing the oil content of a plant materials
containing natural oils and glucosinolates and isolating the
glucosinolates from the reduced oil-content plant materials using a
membrane extraction. Natural oils containing isothiocyanates are also
provided. The natural oils are well-suited for use in skin and hair care
products.