Both animals and plants give suitable proteinaceous materials for the preparation of cosmetic ingredients.
Proteins from fungi and algae, however, are also increasingly being used as protein sources. Proteins typically
obtained from animals include collagen, elastin, keratin, milk, reticulin, fibronectin and silk (from silkworm).
High-protein plants most commonly used as starting material for producing vegetable proteins are wheat and corn gluten, soy,
rice and oat protein concentrates, and defatted oilseeds (peanuts, almond, sunflower).