The following graph shows a typical soy protein amino acid profile. There’s a little asterisk next to the names of essential amino acids.
This graph was made with our amino acid profile comparison tool.
It might be easier to read in table form. Essential amino acids are again marked with an asterisk (*).
|% of total amino acids|
Overall Summary of Soy Protein’s Amino Acid Profile
There are a few points of note in the data above.
First, soy has very low levels of tryptophan, which is an essential amino acid. But as long as you have other protein sources, it’s not a big deal.
Similarly, like all beans, soybeans have a low amount of methionine, it’s one of the hardest amino acids for vegans to get. Still, there are plenty of good methionine sources for vegans if you pay attention to it.
Finally, soy has relatively high levels of a different essential acid – histidine. It has a relatively higher percentage than even whey does.
Overall, soy is a complete protein source with a well balanced amino acid profile.