bestseller
Chocolate
Rich. Smooth. Seriously chocolatey.
1000+ verified reviews · 10,000+ happy customers
Protein your sensitive stomach has been waiting for.
If whey or pea protein has never sat right with you, Spacemilk is the one that finally does. A complete protein grown from baker's yeast that's easy on your stomach.
1000+ verified reviews · 10,000+ happy customers
Protein your sensitive stomach has been waiting for.
If whey or pea protein has never sat right with you, Spacemilk is the one that finally does. A complete protein grown from baker's yeast that's easy on your stomach.
1000+ verified reviews · 10,000+ happy customers
Protein your sensitive stomach has been waiting for.
If whey or pea protein has never sat right with you, Spacemilk is the one that finally does. A complete protein grown from baker's yeast that's easy on your stomach.
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Complete protein
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Gut friendly
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Third-party tested
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Vegan
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Allergen-free
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No bloating
Pick your pour
Choose your flavor to get 20g of complete protein.
110 Cal20g protein0g sugar
Vanilla
A vanilla milkshake that happens to be 20g of protein.
New
Original
Lightly sweetened milk-like flavor for the sensitive palettes.
Limited Edition
Pumpkin Spice
A Fall favorite. Warm, cozy and spiced just right.
One Ingredient
Unflavored
One ingredient, nothing else: pure yeast protein isolate.
What is yeast protein?
Introducing a new source of protein
You already know yeast. It has made our bread and wine for 10,000 years. Hidden inside is a complete protein, grown through fermentation and isolated, refining away everything but the protein itself. An ancient ingredient, reduced to its purest form, Spacemilk.
Most protein comes with a catch: bloating, cramping, a heaviness you've been told to expect. Spacemilk was made to be gentle, and obsessively clean. Every batch is third party tested for peanuts, gluten, dairy, soy, heavy metals, microbials, and pesticides.
Grown in water instead of farmed or raised, Spacemilk can be made anywhere: the desert, underwater, even in space. This is the future of renewable nutrition. Anywhere life may go.
> Everything Else
The mighty little grain with championship stats. Nutrient-packed, clean, and serving serious flavor.
 Spacemilk
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 Whey
|
 Plant
| |
|---|---|---|---|
| Complete protein (PDCAAS 1.0) | Yes | Yes | No |
| Dairy-free | Yes | No | Yes |
| Free from all 9 major allergens | Yes | No | No |
| No added farmland | Yes | No | No |
- easy on the digestion
- Third party tested
- zero grams of sugar
- No Artifical Ingredients
How our protein is made
Yeast has made our bread and wine for 10,000 years. Hidden inside is a complete protein. An ancient ingredient, refined to its purest form.
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Cultivate
Grow yeast in water
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Isolate
Gently break it down with heat
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Purify
Filter out the pure protein & dry
Inside Spacemilk
Every ingredient in Spacemilk was chosen after months of research, countless iterations, and an absolute refusal to compromise on purity, performance, or ethics.
Yeast Protein Isolate
Pure protein separated from fermented baker's yeast, naturally free from all nine major allergens with a perfect protein quality score (PDCAAS) of 1.0.
Organic Alkalized Cocoa Powder
Organic cocoa treated with a gentle alkalizing process that lowers its natural acidity, a century-old technique that yields smoother, darker, less bitter chocolate.
Salt
An essential mineral, used in a small amount to balance and amplify flavor.
Sunflower Lecithin
A phospholipid complex derived from sunflower seeds, hexane-free and cold-processed, that allows powder to disperse evenly in liquid.
Konjac Fiber
A prebiotic soluble fiber from the root of the konjac plant, that lends natural viscosity and dietary fiber.
Reb M (Fermented Rice Sweetener)
A zero-calorie sweetener fermented from rice, yielding Reb M, a single clean molecule prized for tasting closest to sugar.
Natural Flavors
Flavors drawn from natural sources through gentle, food-grade extraction (water, CO₂, and ethanol), with nothing artificial at any step.
Yeast Protein Isolate
Pure protein separated from fermented baker's yeast, naturally free from all nine major allergens with a perfect protein quality score (PDCAAS) of 1.0.
Salt
An essential mineral, used in a small amount to balance and amplify flavor.
Sunflower Lecithin
A phospholipid complex derived from sunflower seeds, hexane-free and cold-processed, that allows powder to disperse evenly in liquid.
Konjac Fiber
A prebiotic soluble fiber from the root of the konjac plant, that lends natural viscosity and dietary fiber.
Reb M (Fermented Rice Sweetener)
A zero-calorie sweetener fermented from rice, yielding Reb M, a single clean molecule prized for tasting closest to sugar.
Natural Flavors
Flavors drawn from natural sources through gentle, food-grade extraction (water, CO₂, and ethanol), with nothing artificial at any step.
Yeast Protein Isolate
Pure protein separated from fermented baker's yeast, naturally free from all nine major allergens with a perfect protein quality score (PDCAAS) of 1.0.
Salt
An essential mineral, used in a small amount to balance and amplify flavor.
Sunflower Lecithin
A phospholipid complex derived from sunflower seeds, hexane-free and cold-processed, that allows powder to disperse evenly in liquid.
Konjac Fiber
A prebiotic soluble fiber from the root of the konjac plant, that lends natural viscosity and dietary fiber.
Reb M (Fermented Rice Sweetener)
A zero-calorie sweetener fermented from rice, yielding Reb M, a single clean molecule prized for tasting closest to sugar.
Natural Flavors
Flavors drawn from natural sources through gentle, food-grade extraction (water, CO₂, and ethanol), with nothing artificial at any step.
Yeast Protein Isolate
Pure protein separated from fermented baker's yeast, naturally free from all nine major allergens with a perfect protein quality score (PDCAAS) of 1.0.
Salt
An essential mineral, used in a small amount to balance and amplify flavor.
Sunflower Lecithin
A phospholipid complex derived from sunflower seeds, hexane-free and cold-processed, that allows powder to disperse evenly in liquid.
Konjac Fiber
A prebiotic soluble fiber from the root of the konjac plant, that lends natural viscosity and dietary fiber.
Reb M (Fermented Rice Sweetener)
A zero-calorie sweetener fermented from rice, yielding Reb M, a single clean molecule prized for tasting closest to sugar.
Natural Flavors
Flavors drawn from natural sources through gentle, food-grade extraction (water, CO₂, and ethanol), with nothing artificial at any step.
Yeast Protein Isolate
Pure protein separated from fermented baker's yeast, naturally free from all nine major allergens with a perfect protein quality score (PDCAAS) of 1.0.
1000+ verified reviews
Loved across the planet
LOVED ACROSS THE PLANET
Happy customers, even happier stomachs. Your search for a protein that checks all of the boxes ends here. Hear from the Spacemilk crew below.
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Delish
I love this protein. It always tastes delicious and has a nice texture and it feels good in my body.
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Best Protein Powder Ever!!
It is SO AMAZING ❤️ best tasting & texture I’ve ever had in a shake!! You guys hit the nail on the head!!
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Love it
I love the taste of all the flavors of space milk so far. I have tried chocolate, vanilla and pumpkin spice.
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Surprisingly good!
I bought my first bag of Spacemilk with skepticism, but really enjoy the taste and texture. It really is delicious!
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Best ever
So far so good! Dissolves with no grit. Tasty. Much much easier to digest. My new go to.
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Excellent!
Excellent product! Mixes easily. No G.I. distress. Excellent taste that isn’t too sweet.
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You need to try this!!!!
I have tried many protein powders! This far and away mixes the smoothest of any I've tried.
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Good Stuff!
It’s good stuff. Has a clean taste and smooth texture. Excited to see what flavors they roll out.
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Delicious
I really enjoy the taste of vanilla Spacemilk. Easy to mix and no bloating after I drink my protein shake.
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Purrfect option for a finicky body
Smooth blending without a chalky aftertaste. No gas or bloating- hurray, finally something that fits my system.
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Gentle on my stomach!
I really love the product, it is so gentle on my stomach while giving the necessary protein boost to my smoothie.
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Love it!
I have tried so many products and Spacemilk is the only one that doesn't upset my stomach and make me feel bloated.
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New favorite
This protein is perfect for a Whole Foods plant based diet. I add my own natural sweeteners with my fruits and veggies.
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Delicious
Awesome! Have tried so many vegan protein powders and this one is best! Great blending, taste, clean ingredients. Amazing!
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Dairy and gluten free
So nice to have a good protein option for dairy and gluten free. Great flavors and mixes better that any protein I have tried.
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Best tasting plant protein on the market!
Hands down, the best taste and consistency of any plant based protein powder I have ever tried. The chocolate flavor is amazing!
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LOVE THIS STUFF!!
I put it in my coffee with collagen in the morning and have a little smoothie to start my day!!
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LOVE IT!
I've tried both chocolate and vanilla. Great consistency. No belly upset. Pairs well with coffee!
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So tasty and smooth!
Love the taste, smooth texture and blend-ability of this powder! It’s great in pancakes and smoothies.
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Real food
Protein from yeast! Genius! Currently mixing with yogurt and peanut butter powder to make a 50g breakfast.
Love it, or it's on us.
Try Spacemilk risk-free for 30 days. Not totally in love? We'll make it right.
Yeast Protein is clinically proven to build lean muscle.
Yeast protein, the protein in Spacemilk, was studied in a randomized, double-blind, placebo-controlled trial in adults over 40.
Lean Muscle
+85%
Builds 85% more lean muscle than placebo after 8 weeks of resistance training.*
See study detailsProtein Quality
1.0PDCAAS
A perfect protein-digestibility score — equal to whey, from sustainable yeast.**
See study detailsDid You Know?
6 in 10 men in this trial weren't eating enough protein to maintain muscle.
Did You Know?
6 in 10 men in this trial weren't eating enough protein to maintain muscle.
Table of contents
Study details
Yeast Protein & Muscle Mass — Double-Blind RCT
A randomised, double-blind, placebo-controlled trial comparing yeast protein (AnPro®), whey protein, and placebo alongside resistance training in healthy men aged 40+. Both protein groups significantly increased lean mass and strength versus baseline; yeast protein performed comparably to whey and better than placebo — most clearly in participants with low habitual protein intake.
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Sample size
79 completed
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Duration
8 weeks
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Population
Men 40+
Methodology
- Three parallel arms: AnPro® yeast, whey protein, placebo (maltodextrin), randomised via Random Allocation Software.
- Participants and investigators blinded to allocation throughout.
- Supervised at-home resistance program, 3 sessions/week; compliance > 96%.
- Outcomes: DEXA lean mass (primary), 1-RM strength, endurance, body composition, blood pressure.
- Registered ACTRN12621000212853p; conducted per the Declaration of Helsinki.
Results / Key findings — yeast arm
- Total lean mass
- +827.6 g ✱
- Lean mass (low-protein subgroup)
- +867 g ✱
- Trunk lean mass
- +337.1 g ✱
- Max bench press
- +5.83 kg ✱
- Diastolic blood pressure
- −2.30 mmHg ✱
Statistical highlights
Significance set at p < 0.05; between-group differences via independent t-tests with ANCOVA for covariates. Powered at 0.95 (α = 0.05) to detect a 50% between-group difference in fat-free mass change. ✱ = significant change from baseline.
Reference
Briskey D, Skinner RA, Zhang H, Chen Z, Rao A. Effect of Yeast Protein on Muscle Mass and Performance in an Adult Population — A Double-Blind, Randomised Controlled Trial. Journal of Food and Nutrition Research. 2024;12(5):292–300.
DOI: 10.12691/jfnr-12-5-9
Reshaping the future of food.
We started Spacemilk to answer a simple question: what if protein could be complete, clean, and kind to the planet, all at once? Yeast turned out to be the answer humans have had all along. We just learned how to unlock it.
Frequently asked questions
SEE ALL FAQs
Isn’t yeast bad for me? Doesn’t it cause candida?
No. Spacemilk is isolated from non-gmo baker’s yeast (Saccharomyces cerevisiae), a food eaten safely for centuries and recognized as safe (GRAS) Since the protein is separated from the yeast, there is no active or inactive yeast left behind in the product, just pure protein.
Is it really equivalent to whey?
Yes. Spacemilk matches whey’s PDCAAS (Protein Digestibility–Corrected Amino Acid Score) with a perfect 1.0 score. It also contains over 21% BCAAs, comparable to whey protein and exceeds whey in several amino acids including arginine, glycine, alanine, and phenylalanine, while matching or closely matching others.
Will it bloat me?
Spacemilk is naturally free of allergens like lactose, gluten, dairy and soy. Our products are formulated to be gentle on the digestive system and gut-friendly. Most users report no bloating, gas or digestive discomfort compared to dairy or plant-based proteins.
Is it third-party tested?
Yes. Every batch is independently third-party tested for heavy metals, microbials, pesticides, and allergens (gluten, dairy, soy, peanuts). Check out our testing page here to view our numbers and methodology.
Is the subscription worth it?
Big time. Subscribers earn up to 12% in credits on every order, get free shipping, receive free gifts, early access to flavors and exclusive Spacemilk content + giveaways.