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Azadirachta indica A. Juss. commonly known as neem is a large evergreen tree in the family Meliaceae. It typically grows up to 15-20 meters tall with a wide, spreading crown. The leaves are pinnate, bright to dark green, with many serrated leaflets. It produces small, white, fragrant flowers arranged in clusters, and its fruits are smooth, green drupes that turn yellow when ripe, each containing a seed called neem seed. It is widely cultivated and naturalized in Nigeria, where it thrives in the savanna and semi-arid regions as a common shade and medicinal tree.

Azadirachta indica exhibits a wide range of medicinal properties due to its rich bioactive compounds such as azadirachtin, nimbin, nimbidin, quercetin, flavonoids, tannins, and polyphenols. These contribute to its anti-inflammatory, antibacterial, antiviral, antifungal, antioxidant, and anticancer effects, among others. In Nigeria, it is highly valued for its broad medicinal uses, particularly for fever management, where leaf decoctions are taken for their antipyretic effect in malaria and other febrile illnesses. For its anti-inflammatory benefits, fresh leaves are crushed into a paste and applied directly to swollen or painful areas to calm redness, heat, and irritation, while neem oil is rubbed on arthritic joints or patches of eczema to reduce discomfort. Neem is consumed as a leaf decoction, infusion, or chewed fresh to provide antioxidants that protect the body against oxidative stress. For diabetes, small quantities of neem leaf decoctions are used to regulate blood sugar and cholesterol levels, while bark or leaf extracts protect the stomach lining against ulcers and digestive disorders. Beyond these, neem oil serves as a natural mosquito repellent and remedy for parasitic infections. Furthermore, neem has anticancer effects by inhibiting tumor growth and triggering cancer cell death, and supports neurological health by protecting nerve cells.

In Nigeria, neem is not widely eaten as a regular food, but its young leaves and teas made from leaf decoctions are sometimes consumed for their nutritional benefits, providing vitamins C, E, and B-complex, along with minerals such as calcium, phosphorus, potassium, iron, and zinc, and antioxidants that help boost immunity and overall health. The seeds yield neem oil, which contains beneficial fatty acids and is occasionally used in small amounts in traditional remedies rather than as a cooking oil.