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 AnPro® 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 →Food Chemistry (Elsevier), 2025
Yeast Protein Demonstrates Superior Amino Acid Balance and Nutritional Quality Compared to Plant Proteins
A 2025 Food Chemistry study found that yeast protein offers a well-balanced amino acid profile and higher nutritional quality than plant proteins, closely matching whey protein as a sustainable, high-value alternative source.
READ MORE →Food Research International (Elsevier), 2025
Yeast-Based Protein Shows Comparable Digestibility and Gut Benefits to Whey and Casein
This peer-reviewed study shows that yeast-based protein matches whey and casein in digestibility and gut health benefits, supporting its potential as a sustainable, high-quality alternative protein.
READ MORE →Journal of Functional Foods, 2022
Yeast Protein Supplementation Found to Counter Muscle Aging via Gut Microbiota
A new study shows that yeast protein supplementation can slow muscle aging in mice by enhancing muscle regeneration pathways and improving gut microbiota diversity.
READ MORE →Current Research in Food Science, 2023
Yeast Protein as a Novel Dietary Protein Source: Comparison with Four Common Plant Proteins in Physicochemical Properties
Researchers found that yeast protein offers high digestibility, strong thermal stability, and promising functional traits compared to soy, pea, wheat, and peanut proteins—making it a sustainable alternative protein for future food applications.
READ MORE →Metabolites, 2022
Yeast Protein as an Easily Accessible Food Source
This review highlights yeast protein as a sustainable and nutritious single-cell protein derived from waste substrates, offering a high-quality alternative to meat and plant proteins while reducing environmental impact and improving global food security.
READ MORE →