Shark liver oil comes from the livers of different types of sharks. It is used as a source of compounds called alkylglycerols, which are a type of fat.
The alkylglycerols in shark liver oil might have anticancer effects and help boost the immune system.
People use shark liver oil for cancer, chemotherapy side effects, common cold, the flu, wound healing, and many other conditions, but there is no good scientific evidence to support these uses.
Don't confuse shark liver oil with other marine oils, including cod liver oil, fish oil, or krill oil. Also don't confuse it with other products that come from sharks, including liver extract, shark cartilage, and squalamine. These are not the same.
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