Quality & Digestibility
Yeast Protein has a PDCAAS of 1.0, based on five batches of amino acid profile analysis and an in vitro digestibility of 84.91 ± 0.52% .
Its protein quality equals whey protein concentrate and is higher than soy protein isolate for adults .
As a complementary protein, Yeast Protein improves digestibility and amino acid absorption in blends .
It also supports gut health—boosting microbial diversity, improving intestinal balance, and increasing short-chain fatty acid production .
Build and Recover, Faster
Yeast Protein is naturally rich in Branched Chain Amino Acids (BCAAs), which help prevent muscle loss and support post-exercise recovery by promoting glucose production .
Tests show BCAA content of ≥20.0%, higher than pea protein isolate and comparable to whey protein concentrate .
Clinical trials show increased lean mass, strength, and endurance in adults 40+ when consumed twice daily at 20 g per dose for 8 weeks, combined with resistance exercise.
At 1 g/kg/day, Yeast Protein also improves muscle size and strength, and helps reverse age-related muscle loss.
Clinically Matched with Whey
Participants: 116 healthy men aged 40+ were enrolled; 79 completed the study.
Intervention: Subjects consumed 40 g of Yeast Protein, whey protein, or placebo (maltodextrin) twice daily for 8 weeks.
Exercise: All participants followed a resistance training program three times per week.
Assessments: Lean mass (DEXA), strength, and endurance were measured at baseline, week 4, and week 8.
Results: Both the Yeast Protein and whey groups showed significant increases in lean trunk and total lean mass.
Yeast Protein is a proven, sustainable alternative to whey for enhancing lean mass, strength, and endurance especially in individuals with low dietary protein intake .
Peer-Reviewed Research
To create the future of nutrition, we started with the facts. We believe any truly innovative product must be backed by transparent, peer-reviewed science. The research presented here forms the evidence-based foundation of Spacemilk, exploring the quality, performance, and safety of our novel yeast protein.
The most important question is: does it work? A high-quality human study found that our yeast protein builds muscle and strength just as effectively as whey protein when combined with exercise. Foundational lab studies explain why: it’s a complete protein with a balanced amino acid profile that is easy for the body to digest and use. Further research shows even more benefits, suggesting yeast protein can help with age-related muscle health, support a healthy gut, and help the body absorb calcium for stronger bones. This body of research is why we are confident that Spacemilk is a trusted, forward-thinking choice for your health.
Journal of Food and Nutrition Research, 2024
Yeast Protein Shown to Rival Whey in Building Muscle and Strength
A double-blind, randomized controlled trial found that yeast protein builds muscle, strength, and endurance as effectively as whey, establishing it as a sustainable, high-performance alternative for supporting muscle growth.
READ MORE →Food Research International (Elsevier), 2025
Yeast Protein Enhances Calcium Absorption and Bone Formation
A 2025 study found that yeast protein enhances calcium absorption, bone density, and strength by improving calcium binding and sustained release, making it a promising functional ingredient for supporting bone health and preventing osteoporosis.
READ MORE →