Other good vegan protein sources
Pea protein is not the only plant protein worth considering, and it is not the right answer for everyone. This is a look at the main alternatives, what each one is good at, and the one idea that matters more than picking a favourite: plant proteins work best in combination.
Why most plant proteins are incomplete
A complete protein contains all of the essential amino acids in the right amounts, and it is only when all of them are present in the proper amounts that the body can build muscle. Most single plant sources fall short somewhere. That is not a flaw to be avoided so much as a fact to work around, because two or more incomplete proteins can be combined to make up a complete one between them.
This is why pea protein suits vegan diets particularly well: it has a more comprehensive amino acid profile than most plant proteins, so it needs less help than the others. It is still worth knowing what the alternatives bring.
Hemp protein
Hemp contains all nine essential amino acids and is valued mainly for what comes with the protein rather than the protein itself. It retains much of the fibre and fatty acid content of the whole seed, including omega-3 and omega-6. That also means it is less protein dense than an isolate: you are getting a whole food rather than a concentrated protein, which is a genuine advantage for some people and a drawback for anyone chasing grams per serving.
Brown rice protein
Brown rice protein is hypoallergenic and easy to digest, which makes it a common fallback for people who react to other sources. Its weak point is lysine, where it is low, while it is well supplied in the other essential amino acids.
Pumpkin seed protein
Pumpkin seed protein is well supplied in the sulphur-containing amino acids, methionine and cysteine, which is exactly where peas are naturally weaker. Like brown rice it is relatively low in lysine, so it does not pair with grains as usefully as pea protein does.
Soy protein
Soy is a complete protein and a long-standing staple for vegetarians and vegans, but it carries allergen and composition concerns that the others do not. We have covered that comparison in full: see pea protein versus soy protein.
Why blends work: pea and rice
Pea and brown rice are close to mirror images of each other. Peas are naturally lower in methionine, which rice supplies; rice is low in lysine, which peas supply. Combined, each covers the other's gap, which is the complementary protein idea applied deliberately rather than left to chance. That is why so many plant-based protein blends on the shelf are built on exactly this pairing, and it is a good reason not to think of these powders as rivals.
So which should you choose?
If you want one powder that does most of the job on its own, pea protein is the strongest single option for most people, and its concentration process takes it to roughly 90% protein. If you want the fatty acids and fibre of a whole food, hemp is the better fit. If you react badly to other sources, brown rice is the gentlest. If you are willing to blend, pea and rice together beat either alone.
Ready to try pea protein? See our list of UK suppliers, or read the frequently asked questions on taste, digestibility and how it is made. As always, this is general information rather than personal advice, so please see our disclaimer.