What is fermented yeast protein?
Most protein powders make you choose between digestibility and completeness. Animal proteins are complete but hard on the gut. Plant proteins are gentler but often miss the full amino acid spectrum. RNWY Complete Protein is neither.
YESTEIN® is derived from fermented nutritional yeast — a slow-digesting protein that delivers every essential amino acid, including leucine, the key trigger for muscle protein synthesis. Fermentation breaks down the outer cell wall, making it far more bioavailable than raw yeast protein.*
For endurance athletes and high-volume trainers, slow digestion means sustained amino acid delivery over several hours, exactly what your body needs for ongoing recovery between sessions.*
Peer-reviewed research shows YESTEIN® performs on par with whey for lean muscle gains without the dairy and the bloat.*
How it compares
RNWY Complete Protein
✓ Full amino acid profile
✓ 5g creatine inside
✓ Digestive enzymes
✓ 100% vegan
✓ Slow-release amino delivery
✓ Dairy-free, no bloat
✓ Informed Sport certified
Typical Whey / Pea Protein
✓ Full amino (whey only)
✗ Creatine sold separately
✗ No digestive enzymes
✗ Not vegan (whey)
✗ Fast spike, drops off
✗ GI issues common
✗ Varies by brand
3 key ingredients
Who it's for
You're not looking for a sugary shake after a casual gym session. You train consistently. You care what goes in your body. You want a protein that works as hard as you do and fits your lifestyle without compromise.
Runners, cyclists, and triathletes who need sustained amino acid release across long training blocks
Get creatine's power and protein's recovery without managing two separate products
A complete protein that doesn't compromise on amino acid quality or performance
Had to give up whey because of GI issues mid-training? This was designed for you
Yeast-derived protein has been shown to be as effective as whey for improving lean mass and strength in trained athletes.*
Protein + creatine in every serving makes recovery simple. Spend more time doing what you love.*
Daily creatine improves power output during high-intensity efforts and supports endurance over time.*
Digestive enzymes mean your body actually uses the protein you're putting in, not just passing it through.*
YESTEIN® is a complete vegan protein derived from nutritional yeast via fermentation. Fermentation breaks down the outer cell wall, dramatically improving absorption. It contains all 9 essential amino acids and digests more slowly than whey, providing sustained amino acid release for several hours.*
Most athletes who use protein powder should also be taking 3–5g of creatine monohydrate daily. We've included the clinically effective 5g dose so you get both in a single step to simplify your routine.*
Yes. Peer-reviewed research comparing YESTEIN® to whey protein has found comparable results for lean muscle gains and strength improvement in trained athletes. Its slower digestion may actually benefit endurance athletes who need prolonged amino acid availability.*
Post-workout is ideal to maximize recovery benefits. Because YESTEIN® is slow-digesting, it continues releasing amino acids for hours, making it ideal as a post-workout shake or part of a meal. Daily consistency matters more than precise timing.*
Complete Protein is 100% animal-free, vegan, and vegetarian-friendly. Each serving contains 25g protein and 5–6g carbs, which may align with keto or paleo goals. Check the Supplement Facts panel to confirm it fits your targets.*
Complete Protein mixes cleanly with water or your milk of choice without clumping or grit. The digestive enzyme complex helps with both mixability and absorption. Available in Chocolate and Vanilla, both naturally flavored with no artificial sweeteners.
Ready to upgrade your protein?
Join thousands of athletes who've made the switch to fermented yeast protein. One daily serving to build muscle, accelerate recovery, and keep moving.*
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Overall rating: 4.614035 / 5 from 57 reviews.
RNWY Complete Protein is a vegan protein supplement designed to support lean muscle growth and improve athletic recovery. It contains 25g of protein per serving, 5g of creatine monohydrate, and 150mg of digestive enzymes to aid nutrient absorption. Ideal for post-workout recovery, it can also be added to smoothies or breakfast bowls.
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"Have been using this product for 30 days, just recieved my second delivery Overall i find he product Relax The Back , the taste is ok, took a little getting used to. Used a competitive product prior, found taste to be better nonetheless, am overall satisfied"
"Finally a found a protein powder that is NOT chalky, dissolves perfectly and has great flavor! I love both the vanilla and chocolate flavors. I mix it with my smoothie every morning. Was having Plant Protein before - this is much better in terms of texture and flavor."
"I have tried another brand of yeast protein powder - I was happy with how it made me feel but it tasted awful (I ended up getting unflavored just to get it over with). THIS is such an upgrade, more protein per serving, plus the creatine, and the flavor (I got chocolate) is great, no weird after taste and not chalky. It blends really well with my little handheld frother. I’m glad I took a chance on trying this, absolutely worth it."
"Absolute love this product. Doesn’t bloat me like whey protein. Amazing for recovery. Have purchased both the vanilla and the chocolate. The chocolate is slightly better in flavor than the vanilla but dear lord. The taste. I’m not sure if it’s the stevia or what but it tastes really foul. The vanilla especially tastes highly manufactured and has a grim after taste. Will I keep purchasing? Yes. Do I implore RNWY to evaluate the flavor profile? Please yes."
"its in the main rotation now"
"It is delicious, low in calories especially for how much protein it has, and I l9ve that it has creatine already in it. I used to mix creatine in my protein drinks so this is perfect for me!"
"Taste, texture, and trust. I’m on my third order now and will keep coming. I’ve tried other yeast products and a bunch of the pea-based products. RNWY has done a great job here."
"Best tasting protein I’ve used & I’ve tried a ton of different branss. By far this is the best. Also love that its vegan & also includes collagen."
"I’m sorry but this product made me sick to my stomach and throw up. Unfortunately will not be purchasing again."
"After several years of struggling with tender achilles I can finally ramp up my training load and increase my weekly running mileage. In addition to being more disciplined about gradually ramping up mileage, I have been consistent with using RNWY products daily to power my runs and to help with recovery. It’s made all the difference! Thanks RNWY!"
