What is textured soy protein and why is it in everything right now?
Ingredient deep-dive
TSP has been a staple of plant-based cooking for decades. Here's what it actually is, how it's made, and why it punches harder than most protein sources you'll find in a snack aisle.
Textured soy protein shows up in ingredient lists everywhere. Protein snacks, meat-free mince, high-protein cereal bars. Most people read it and move on. It deserves more credit than that.
It is not a cheap filler. It is one of the most protein-dense ingredients in food. It is also the base of Ambry's High Protein Crunch Cubes.
34 gProtein per 100g
0 mgCholesterol
100%Plant-based
All 9Essential amino acids
What it actually is
Textured soy protein, also called TSP or textured vegetable protein (TVP), is made from defatted soy flour. That's the soy bean after most of its oil has been extracted. The remaining flour is incredibly high in protein, and when it's processed under heat and pressure through a technique called extrusion, it takes on a fibrous, chewy, meat-like texture.
The result is a dry ingredient that's shelf-stable, light, and protein-dense. When it absorbs moisture from cooking, it takes on a satisfying, meaty texture. That combination is why it shows up in both professional kitchens and snack labs.
The extrusion process is the same one used to make pasta, breakfast cereals, and pet food. It's a decades-old food manufacturing technique, not a novel chemical process.
How does it compare to other protein sources?
Per 100g, here's how it stacks up:
| Protein source | Protein per 100g |
|---|---|
| Ambry's Crunch Cubes (TSP) | 34g |
| Cooked chicken breast | 31–32g |
| Canned tuna | 25–26g |
| Firm tofu | 8–10g |
| Greek yoghurt | 9–10g |
| Edamame | 11–12g |
TSP contains more protein per 100g than cooked chicken breast, with zero cholesterol. For something that requires no refrigeration and fits in your bag, that's a genuinely remarkable nutritional profile.
Is it a complete protein?
Yes. Soy is one of the very few plant proteins that contains all nine essential amino acids. That makes it a complete protein, on par with meat, eggs, and dairy. Most plant proteins, peas, rice, hemp, need to be paired with other sources to cover the full spectrum. Soy does not.
If you are trying to hit protein targets without leaning on meat, TSP is one of the most efficient options available.
Is it heavily processed?
TSP is a processed ingredient. It is not a whole food the way an edamame pod or a lentil is. But processed covers a wide range. TSP is made from soy flour using heat, pressure, and extrusion. No solvents, no synthetic chemistry. Compare that to the snacks built on layers of stabilisers and emulsifiers before they reach the shelf.
What goes with the TSP matters too. Ambry's Crunch Cubes pair the base with natural seasonings, kimchi, mala, seaweed, without artificial colours or preservatives in the base.
Try it for yourself
High Protein Crunch Cubes — four flavours, one seriously good texture
34g of protein per 100g. Made from textured soy protein. No refrigeration needed. Available in Original, Mala, Seaweed, and Kimchi Jjigae.
Shop the Crunch Cubes →Who eats textured soy protein?
Historically, TSP has been a staple in vegetarian and vegan cooking — it's been used for decades as a meat substitute in bolognese, tacos, and curries. But increasingly, it's showing up in mainstream health food, sports nutrition, and high-protein snacking because the numbers are hard to argue with.
It shows up on the plates of people cutting back on meat who still want real protein. It is in the kit bags of runners and gym regulars who need something that travels. And it has found its way to anyone who has looked at the cholesterol numbers on a chicken breast and wondered if there is a smarter path to the same protein number.
Does it taste like anything on its own?
Dry TSP is fairly neutral. Slightly nutty, slightly beany. Nothing remarkable on its own. But it absorbs flavour well, and that is the point. In Ambry's Crunch Cubes, the TSP is seasoned and fried until it develops a deep savouriness and a proper crunch. The mala picks up Sichuan pepper heat. The seaweed gets a clean umami finish. The neutrality of the base is what lets those flavours actually land.
Frequently asked questions
Is textured soy protein safe to eat regularly?
Yes. TSP has been consumed safely for decades across Asia, Europe, and the Americas. Soy is one of the most studied foods in nutrition science. Current consensus from major health bodies supports regular soy consumption as part of a balanced diet.
Does soy protein affect hormones?
Soy contains isoflavones, plant compounds that weakly mimic oestrogen. It is one of the most studied areas in nutrition. The consensus across decades of research is that moderate soy consumption does not meaningfully disrupt hormone levels in healthy adults. If you have a specific medical condition, talk to your doctor.
Is TSP suitable for people with soy allergies?
No. Soy is a major allergen and TSP is derived directly from soy. Anyone with a soy allergy should avoid it. Ambry's Crunch Cubes clearly declare soy and wheat (gluten) as allergens on pack.
Is textured soy protein the same as soy protein isolate?
They're related but different. TSP is made from defatted soy flour and retains more of the whole soy composition. Soy protein isolate is a more refined form with a higher protein concentration (~90g/100g) but a different texture and use case. Ambry's Crunch Cubes use TSP as the primary base.
Is textured soy protein the same as tofu?
No. Tofu is made from soy milk that's been curdled and pressed — similar to how cheese is made. TSP is made from defatted soy flour using an extrusion process. They start from different parts of the soy bean and result in very different textures, nutritional profiles, and uses.
