Neem oil is derived by pressing the seed kernels of the neem tree. It is very bitter with a garlic/sulfur smell. A single seed may contain up to 50 percent oil by weight. Neem oil is an excellent moisturizing oil and contains various compounds that have insecticidal and medicinal properties. It is used in making shampoos, toothpaste, soaps, cosmetics, mosquito repellants, creams and lotions, pet products like pet shampoo, etc. It also contains vitamin E, other essential amino acids and some percentages of fatty acids. Neem oil is used for treating many skin diseases viz. eczema, psoriasis, skin allergies, etc. and is being studied for making contraceptives in India. A compound found in Neem Oil and neem leaves extract- 'Salannin', has been proven to be safer but more effective insect repellant than DEET. Neem provides protection from not only mosquitoes, but also from biting flies, sand fleas and ticks.