natural material; natural ingredient
Refers to materials or ingredients derived from nature, often used in contexts like food, cosmetics, or building materials.
This cosmetic is made only from natural ingredients.
When building a house, I want to use natural materials as much as possible.
天然素材 also means natural material, but often emphasizes that the material is unprocessed or directly from nature, while 自然素材 can include minimally processed natural substances.
Compound of 自然 (しぜん, 'nature') and 素材 (そざい, 'material, ingredient').