The differences between soy protein and whey protein mainly lie in the following aspects：

Different sources of protein：whey protein, derived from milk, is a complete animal protein. It contains various components, such as β-lactoglobulin and α-lactalbumin. Soy protein, derived from soybeans, is a complete plant-based protein.

Difference in amino acid composition：both contain a complete amino acid composition, with soy protein having slightly lower methionine and leucine content.

Digestion and absorption rate：whey protein is a rapidly digestible protein, while soy protein releases amino acids more gradually, providing a longer-lasting sense of fullness.

Different functional characteristics：soy protein helps lower cholesterol and is lactose-free, making it suitable for people with lactose intolerance.Whey protein has a better effect in promoting muscle synthesis.

Environment and sustainability : soy protein is superior to whey protein in terms of carbon emissions, land occupation, and water consumption, making it a more sustainable protein source.