Flip over most protein powders and you'll find more than just protein. Tucked into the ingredients are often stabilisers and emulsifiers — additives with names like xanthan gum, carrageenan, soy lecithin or polysorbate 80. They're there for a reason, but for anyone with a sensitive gut, they're worth a second look.
What are stabilisers and emulsifiers?
Emulsifiers help oil and water mix so a shake stays smooth instead of separating. Stabilisers and thickeners (the gums) give powder a richer, creamier texture and stop it clumping. In short, they're texture tools — they make a product feel nicer, but they add nothing nutritional.
Why do manufacturers use them?
They're cheap, effective and they hide imperfections. A powder bulked with gums can feel premium even if the underlying protein is basic. They also extend shelf life and improve how a shake mixes with cold water. For mass-market brands, that's a win. For your digestion, the trade-off isn't always so clear.
What does the research say?
A growing body of research — much of it early, and some in animal models — has raised questions about certain emulsifiers. Studies have suggested that additives such as polysorbate 80 and carboxymethylcellulose can alter the gut microbiota and thin the protective mucus layer of the gut, which in some models was linked to low-grade inflammation. It isn't the final word, but it's enough that many gut-health researchers now urge caution.
Why it matters more if you have IBS
If your gut is already sensitive, you have less margin for irritation. Fibres like inulin and gums such as guar are also fermentable, which can mean bloating and gas for people with IBS. When you're trying to calm symptoms, the last thing you want is a daily shake quietly working against you.
Why That Protein leaves them out
Our super protein blends are 100% free from stabilisers and emulsifiers. We don't need them, because we're not trying to disguise anything — our blends are made from a handful of real ingredients like organic brown rice protein, raw cacao, roasted peanuts and coffee. The texture comes from the food itself, not from a lab.
What to look for instead
Choose a powder with a short, recognisable ingredient list and no gums, emulsifiers or thickeners. A certified low FODMAP formula is a strong signal it's been built for sensitive digestion. Our Blissful Raw Cacao has just two ingredients; our Nutty Nutty Peanut Butter blend keeps it equally simple.
Frequently asked questions
Are emulsifiers in protein powder bad for you?
For most people they're considered safe in normal amounts, but emerging research suggests some may affect the gut — and they can be a problem if you have IBS.
Which emulsifiers should I watch for?
Common ones include carrageenan, polysorbate 80, carboxymethylcellulose, and gums such as xanthan and guar.
This article is for general information and isn't medical advice. If you have ongoing digestive symptoms, speak to a GP or registered dietitian.
References: Chassaing B, et al. Nature (2015) 519:92–96. Roberts CL, et al. Microbiome (2022) 10:92.