Brown rice protein is one of the most common vegan protein powder ingredients.
Here’s a graph of brown rice’s standard amino acid profile:
Even though it’s a bit tough to see, the essential amino acids are marked with a star (*).
You can compare the amino acid profile of other protein sources against brown rice using our amino acid profile comparison tool.
Here’s the data again in table form if you prefer:
|Amino Acid||% of total amino acids|
Is Brown Rice Protein a Complete Protein?
Let’s be clear here, brown rice is not a complete protein because rice has such a low amount of protein in it.
However, when brown rice protein is extracted, which is usually how it’s added to certain foods and supplements, it obviously has enough protein to be looked at further.
The second aspect of a complete protein is the balance of essential amino acids.
Let’s compare brown rice protein’s essential amino acid to the minimum standards of a complete protein set by the WHO (1).
Complete Protein (min %)
|Brown Rice (%)|
Like many grains, brown rice protein is low in lysine.
That’s why it’s often paired with good plant-based sources of lysine like legumes when used in protein powders.
Overall Summary of Brown Rice Protein’s Amino Acid Profile
Brown rice is almost a complete protein (a bit lacking in lysine as noted in a comment below).
It contains all the essential amino acids, and its amino acids are well balanced, even more so than dairy milk.
Another comparable amino acid profile is spirulina, which is another great plant-based source of protein.