Rice protein powder is not a complete protein source. Unlike animal-based protein sources, such as whey or eggs, rice protein powder does not contain all of the essential amino acids in sufficient quantities to be considered a complete protein source. Specifically, rice protein powder is low in the essential amino acid lysine.
However, rice protein powder can be combined with other plant-based protein sources, such as pea protein or hemp protein, to provide a complete protein source. This combination of plant-based protein sources can provide all of the essential amino acids needed for optimal health and function.
It's important to note that while rice protein powder is not a complete protein source on its own, it can still provide a significant amount of protein and be a useful addition to a balanced diet, especially for individuals following a plant-based diet.