Squalene is a form of lipid matter found in both plants and animals. Commonly it is used in lotions and anti-aging creams due to its skin conditioning properties. It is said to be similar to human sebum, protecting the outer layer of skin from environmental damage and free radicals. Squalene is said to prevent age spots, reduce the appearance of wrinkles and even alleviate some symptoms of psoriasis, eczema and excessively dry skin. The Environmental Working Group labels this ingredient as presenting zero toxicity to human health.