Choosing a Plant Protein Powder: Pea, Soy, and Rice Protein Compared

The Three Mainstream Plant Protein Powders

• Pea protein: relatively high in branched-chain amino acids, almost never allergenic, somewhat chalky in texture — a common first choice in the fitness world
• Soy protein isolate: a relatively complete amino acid profile, close to a complete protein, though some people are sensitive to soy or wary of the phytoestrogen question
• Rice protein: low allergenicity, but low in lysine, so it's usually blended with pea protein to round out the amino acid profile
• Hemp protein: a fairly full amino acid range, plus omega-3 fatty acids and dietary fiber, though its protein purity tends to be lower

How to Choose

If you're sticking to just one type, pea protein and soy protein isolate generally have the more complete amino acid profiles. If you want an even more balanced amino acid spread, a pea-and-rice protein blend is a good option. For anyone sensitive to soy or concerned about thyroid issues, pea protein is usually the safer first choice.

Tips for Buying

Check the ingredient list and favor products with less added sugar and fewer flavorings. Pay attention to the actual grams of protein per serving rather than the total scoop weight — some products call it "one scoop" while the actual protein content varies widely between brands. Protein powder is a dietary supplement, not a replacement for the whole soy foods and whole grains in your regular meals. Once mixed, it's best to drink it promptly, since letting it sit too long can affect both taste and how well it dissolves.