7 Reasons People With Sensitive Stomachs Are Switching to Yeast Protein
If every protein shake leaves your stomach in knots, it might not be you. It might be the protein.
Not whey. Not plant.
A third kind...
If whey and plant protein both bothered your stomach, switching brands can feel like trying the same thing again.
RNWY Complete Protein changes the protein source itself. It’s made from fermented yeast—a third option when the usual powders haven’t agreed with you.
See what makes it different ↓
No dairy + No lactose
Most whey powders still contain lactose, the milk sugar many adults have trouble digesting. It's one of the most common reasons a shake leaves you bloated. RNWY is 100% dairy-free, so that trigger is gone completely.
Certified Low FODMAP by Monash University
FODMAPs are carbs that ferment in your gut and commonly cause gas and bloating. They’re found in lactose and in many plant proteins. RNWY is independently tested and certified Low FODMAP by Monash University—giving sensitive stomachs reassurance backed by testing, not just promises.
Digestive enzymes in every scoop
Each serving has a 150mg blend of five enzymes that break down protein, carbs, fat, fiber and lactose, so your stomach doesn't have to do all the work.*
Smooth, not chalky
Naturally flavored Chocolate and Vanilla that mix into water, milk, smoothies, oatmeal or coffee. Like it thinner? Add a splash more liquid.
Nothing extra for your stomach to fight
No sugar, no artificial sweeteners, no dairy, gluten or GMOs. Just a short, simple ingredient list you can actually read.
A complete protein, just like whey
25g of protein with all 9 essential amino acids. Research found YESTEIN® comparable to whey for building lean muscle and strength.*
RNWY Complete Protein
25g of fermented yeast protein with digestive enzymes and 5g of creatine. Dairy-free, Low FODMAP certified, and made to sit easy.*
- Low FODMAP Certified
- Dairy-Free
- Sugar-Free
- Gluten-Free
Select Flavor: Vanilla
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- Monash Low FODMAP Certified™
- Informed Sport Certified
- Non-GMO Project Verified
Why it's easy on your stomach
No dairy or lactose. Lab-tested Low FODMAP by Monash University. A 150mg enzyme complex (protease, amylase, lipase, cellulase, lactase) to help break it down.*
Ingredients & allergens
Ingredients
Complete Protein is built on YESTEIN®, a fermented nutritional yeast protein, delivering 25g of protein and all 9 essential amino acids per serving. Every scoop also carries 5g of creatine monohydrate, the full clinically effective dose, and a 150mg digestive enzyme complex (Alpha-Amylase, Neutral Protease, Lactase, Lipase, Cellulase) to help your gut process it.
Allergies
Complete Protein is 100% vegan, dairy-free, lactose-free, casein-free, gluten-free, and animal-free. Non-GMO Project Verified.
How to use
Mix one 1/3 cup serving (about 43g) into water, milk, a smoothie or oatmeal. No scoop in the bag, to cut single-use plastic. Any 1/3 measuring cup works. Like it thinner? Add more liquid.
Science & certifications
Informed Sport Certified
Every batch is third-party tested and certified against 250+ banned substances, the same standard used by professional and Olympic athletes. No guessing what's in your scoop.
Monash Low FODMAP Certified™
Independently certified by Monash University, so your gut has one less variable to manage on race week.
Certifications
Non-GMO Project Verified. Up-cycled Certified. 100% vegan, gluten-free, and animal-free.
Chocolate vs. Vanilla
Same formula, same 25g protein, 5g creatine, and full amino profile in both. Chocolate and Vanilla are both naturally flavored, no synthetic sweeteners. Pick whichever you'll actually finish the shaker for.
Packed With
- 25g Protein
- 5g Creatine
- 9 Essential Aminos
- Digestive Enzymes
- 3g Fiber
- 100% Vegan
- Gluten-Free
- Non-GMO
Loved by Sensitive Stomachs Everywhere
Questions
What is fermented yeast protein?
It's a complete protein made from nutritional yeast through fermentation. Fermentation breaks down the yeast's outer cell wall so the protein is easier for your body to use.* It's a third kind of protein, separate from whey (milk) and plant (pea, rice).
Is it live yeast?
No. It's a purified protein made from yeast, not active yeast like you'd bake with. If you've been told to avoid yeast, check with your doctor first.
Will it upset my stomach?
Every stomach is different. RNWY is dairy-free, lab-tested Low FODMAP by Monash University, and includes digestive enzymes, which is why so many customers with sensitive stomachs say it sits easy.
I'm coming from whey. Will it work as well?
Each serving has 25g of complete protein with all 9 essential amino acids. Peer-reviewed research found YESTEIN® comparable to whey for lean muscle and strength gains.*
I'm coming from plant protein. Is it chalky?
Most customers say it's smoother than the plant proteins they've tried. It does run a little thick, so add more liquid if you like a thinner shake. Milk or a smoothie makes it creamiest.
What does it taste like?
Chocolate is a rich cocoa flavor that isn't overly sweet. Vanilla is light and mixes into almost anything. Both are naturally flavored and sweetened with stevia, with no sugar.
Why is creatine in it? Do I need it?
Creatine is one of the most researched supplements for strength and power.* We include 5g so you get it without buying a second product. It's not just for bodybuilders.
Why isn't there a scoop?
We left it out to cut single-use plastic. One serving is 1/3 cup, so any measuring cup works.
Reviews:
4.6
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4.6 rating from RNWY store reviews. Additional reviews from Amazon shown below.