Tamanu oil is a widely used ingredient in cosmetics, personal care, and skincare formulations. Depending on its function, it may serve as a moisturizer, preservative, emulsifier, or active ingredient to enhance the overall effectiveness and performance of a product.
Tamanu oil is pressed from nuts of either Calophyllum inophyllum (usually) or Calophyllum tacamahaca (ati), tropical trees belonging to the Calophyllaceae family. The oil originates in Polynesia, where it continues to play an important cultural role.[citation needed]

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Commercial uses of tamanu oil are predominantly for skin care. The oil has value and use as a fuel. Calophyllum inophyllum oil (CIO) is rich in antioxidants and contains UV-absorption properties.