STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Oil capsules. Packaged oil capsules. Capsules like these are taken as dietary supplements because they contain fatty acids which are essential for good health; some oils also contain the fat-soluble vitamins A, D, E and K. There are a number of different oil capsules from a variety of sources, the exact properties of the oil depending upon the source as there are over 40 fatty acids found in nature.
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