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Sensitive stomachs

YEAST PROTEIN EXPLAINED: 5 THINGS TO KNOW BEFORE YOU TRY IT

It’s not whey. It’s not plant. It’s the first protein made from baker’s yeast, and here’s what that actually means.

4.9 out of 5 · 1000+ verified reviews · 10,000+ happy customers

By Michael A

Updated October 2026 · 4 min read

A NEW PROTEIN FROM A VERY OLD INGREDIENT

Baker's yeast. An ancient nutritional ingredient humans have used for thousands of years. Spacemilk takes that same familiar yeast and isolates the protein from it. 

“Protein from yeast! Genius!”

Greg L.Verified customer

FERMENTATION GAVE US SOURDOUGH AND KOMBUCHA. NOW IT GIVES US PROTEIN.

We grow baker’s yeast in water through fermentation, gently break it down with heat, then filter out the protein and dry it. What’s left is pure protein isolate, with no live or active yeast.

Start with Vanilla

20g protein, milkshake flavor, with none of the dairy or sugar. New customers get 30% off plus a free bag of creatine.

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Gold Standard Protein Quality

Each scoop has 20g of protein with all 9 essential amino acids, and a PDCAAS of 1.0, the same protein quality score as whey and egg.

  • No dairy
  • No lactose
  • No gluten
  • No soy
  • No gums
  • No fillers

THE BEST OF BOTH worlds

Whey comes with dairy, and that’s why so many people end up bloated. Plant protein comes with pea, soy, grit and a long list of allergens. Yeast protein comes with neither. It’s light on your stomach and free from all 9 major allergens.

WHAT THE PEOPLE ARE SAYING:

“Over the years I’ve used countless types and brands of protein powder, whey isolate, plant based, vegan and all have caused digestive issues… No digestive issues, tastes great, mixes well. I’m sold!”

VERIFIED CUSTOMEROCT 2026
Try it risk-free

spacemilk complete protein

Pick your flavor and get 30% off your first order, plus a free bag of creatine. Covered by a 30-day promise.

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Flavors
  • Chocolate
    Smooth cocoa
    0
  • Vanilla
    Classic milkshake
    0
  • Unflavored
    One ingredient
    0
  • Original
    Mild, lightly sweet
    0
  • Pumpkin Spice
    Warm fall flavor
    0
  • Save 9% or more on every order
  • Skip, pause, or cancel anytime
  • Earn up to 12% back in store credit
Your free gifts
  • Creatine
    $19.99 FREE
    3rd order
  • Spacemilk Hat
    $24.99 FREE
    6th order
  • Bag of protein
    $29.99 FREE
    9th order
First order
Every order after
Your free gifts
  • Creatine $19.99 Today
  • Creatine $19.99 3rd order
  • Spacemilk Hat $24.99 6th order
  • Bag of protein $29.99 9th order

Renews every 30 days. Skip or cancel anytime.

No off · no free creatine

The Spacemilk difference

vs everything else

WHEY PLANT
Complete protein (PDCAAS 1.0)
Dairy-free
Free from all 9 major allergens
No added farmland
The proof

every batch tested and published

Every batch goes to Advanced Laboratories, an independent FDA-registered lab, for heavy metals, allergens, microbials and pesticides. Spacemilk publishes the measured numbers in full.

Vanilla, lot 261185 Advanced Laboratories
Lead 0.018 ppm
Mercury 0.001 ppm
Gluten <5.0 ppm
Dairy <2.5 ppm
Staph aureus <10 CFU/g

Tested Aug 19, 2026. A “<” means not detected down to the lab’s lowest measurable level.

+85%

In a randomized, double-blind, placebo-controlled trial in adults over 40, yeast protein built 85% more lean muscle than placebo after 8 weeks of resistance training.*

*Study of yeast protein, the protein in Spacemilk.

4.9 out of 5

Real reviews, happy stomachs

  • Gentle on me

    Protein powders are super hard on me, but this stuff is really gentle. It blends easily, my family and I all like the taste, AND I don’t have to worry about heavy metals like with other protein powders.

    Vanessa M.Verified buyer

  • Love it

    I love the taste of all the flavors of space milk so far. I have tried chocolate, vanilla and pumpkin spice.

    Karen C.Verified buyer

  • Delish

    I love this protein. It always tastes delicious and has a nice texture and it feels good in my body.

    Kirstin C.Verified buyer

  • I really love the product, it is so gentle on my stomach while giving the necessary protein boost to my smoothie.

    Cassandra U.Verified buyer

  • I have tried so many products and Spacemilk is the only one that doesn’t upset my stomach and make me feel bloated.

    Dee R.Verified buyer

  • I really enjoy the taste of vanilla Spacemilk. Easy to mix and no bloating after I drink my protein shake.

    Nathan W.Verified buyer