How is Vegan Protein Made: Top Picks, Prices and What to Buy

Every vegan protein powder starts with a protein-rich plant source. For pea protein, this is yellow split peas. For soy protein, soybeans. For rice protein, brown rice. The specific variety and growing conditions affect the protein content and amino acid profile of the raw material before processing even begins.

The raw crop is first cleaned, dehulled where necessary, and milled into a flour or paste. At this stage, the material contains protein alongside starch, fibre, fat, and water, all of which need to be separated.

Pea protein production uses a wet process. The milled pea flour is mixed with water, and the pH is adjusted to dissolve the proteins into solution while leaving most of the starch and fibre behind. The protein-rich liquid is then separated, and the pH is shifted again to cause the protein to precipitate out of solution.

The precipitated protein is collected, washed to remove remaining impurities, and spray-dried into a fine powder. The result is a protein concentrate typically at 80-85% purity, or an isolate at 85-90% purity with further processing.

Soy protein production involves an additional step compared to pea: the soybeans must be defatted first, since soy has a significantly higher fat content than peas. Solvent extraction using hexane is the industrial standard method, though some producers use expeller pressing or aqueous extraction as alternatives.

After defatting, the protein is separated from the carbohydrates using a similar isoelectric precipitation process to pea protein. Soy protein concentrate retains more carbohydrates; soy protein isolate, at 90%+ protein, undergoes further processing to remove them. Most protein powder products use the isolate form.

Rice protein extraction uses enzymatic processing. Brown rice is treated with enzymes, typically protease and amylase, that break down the starch into sugars while leaving the protein intact. The remaining protein is then separated, washed and dried.

Rice protein is naturally hypoallergenic and relatively neutral in flavour, which makes it a useful blending partner for pea protein. Alone it is low in lysine; blended with pea it forms a complete amino acid profile.

Once the raw protein powder is produced, manufacturers blend in flavourings, sweeteners, emulsifiers and any additional ingredients. Lecithin, typically from sunflower for vegan products, is commonly added to improve mixability.

The finished powder is tested for protein content, microbial safety and contaminants before packaging. Third-party batch testing is important for quality assurance; reputable brands publish certificates of analysis or use independent testing organisations such as Informed Sport.

More processing generally means higher protein purity but also higher cost. A basic pea concentrate at 80% protein is cheaper per gram of powder but delivers slightly less protein per scoop than a 90% isolate.

Processing method also affects digestibility. Enzymatic processing of rice protein improves its bioavailability compared to unprocessed rice. Soy protein isolate has higher digestibility than soy flour because the processing removes anti-nutritional factors present in whole soybeans.