What is yeast protein isolate?

Yeast protein isolate is a complete protein derived from nutritional yeast. It contains all essential amino acids, is highly bioavailable, and is much easier to digest than whey or plant proteins.

Why is yeast protein easier to digest?

Unlike whey which can cause bloating and discomfort, yeast protein isolate has a unique amino acid profile that's gentle on your digestive system. Many people who struggle with other protein sources find yeast protein works perfectly for them.

Do you have allergen-free options?

Yes! Our Lemon Bar, Marshmallow Chocolate Chip, Blueberry Vanilla Crunch, and Salted Dark Chocolate flavors are completely free from all top 9 allergens.

How much protein is in each bar?

Each Astro Bar contains 22-23g of complete protein, primarily from yeast protein isolate with additional protein from seed or nut butters and oats.

Yeast protein is the future.

Animal freeRegenerativeNo seed oilsNothing artificialGluten freeTop 9 allergen free options

•Yeast Protein Isolate•Free Shipping Over $50•20+ Grams of Protein•Easy to Digest•Top 9 Allergen Free Options•100% Satisfaction Guarantee•Yeast Protein Isolate•Free Shipping Over $50•20+ Grams of Protein•Easy to Digest•Top 9 Allergen Free Options•100% Satisfaction Guarantee•Yeast Protein Isolate•Free Shipping Over $50•20+ Grams of Protein•Easy to Digest•Top 9 Allergen Free Options•100% Satisfaction Guarantee•Yeast Protein Isolate•Free Shipping Over $50•20+ Grams of Protein•Easy to Digest•Top 9 Allergen Free Options•100% Satisfaction Guarantee

Shop our best sellers.

1.000.500.00

1.00

Yeast Protein Isolate

1.00

Whey Protein

0.98

Soy Protein

0.89

Pea Protein

0.63

Hemp Protein

0.47

Rice Protein

Data reflects published peer-reviewed research on protein quality scoring (FAO/WHO standards). View study →

Backed by science.

The cleanest protein with nothing to hide.

Perfect score.

Yeast protein isolate achieves the maximum PDCAAS of 1.00 — the gold standard for protein quality, matching whey while being easier to digest.

Complete amino acids.

Contains all essential amino acids your body needs. The highest indispensable-to-dispensable amino acid ratio (0.91) of any protein source.

Outperforms plants.

Surpasses soy, pea, and rice protein in digestibility-corrected quality. No blending required for a complete amino acid profile.

Built Different

We didn't just make another protein bar. We rethought what a protein bar could be.

Revolutionary Protein

Yeast protein isolate is the future of clean nutrition. More bioavailable than whey, easier to digest, and completely animal-free.

No Bloating

Tired of protein bars that wreck your stomach? Yeast protein is gentle on digestion. No discomfort, no bloating — just clean fuel.

Clean Ingredients

No artificial sweeteners, no sugar alcohols, no mystery ingredients. Just real food that fuels your body the way nature intended.

Real people. Real results.

Sarah M.Verified Buyer

01/28/26

Finally a bar I can eat!

I have multiple food allergies and have never been able to find a protein bar that's safe for me. Astro Bar changed everything. The cranberry ginger combo is incredible!

Cranberry Bliss

Jason R.Verified Buyer

01/25/26

Best macros on the market

22g protein with clean ingredients and no bloating? Sign me up. I've replaced my whey bars completely. The lemon is so refreshing.

Lemon Bar

Priya K.Verified Buyer

01/22/26

No more stomach issues

Whey protein always upset my stomach. Yeast protein isolate is so much easier to digest. These bars are a game changer for my workouts.

S'mores

Marcus T.Verified Buyer

01/20/26

Tastes like a real dessert

I was skeptical about protein bars that claim 'no bloating' but this actually delivers. And the chocolate hazelnut flavor is incredible.

Chocolate Hazelnut

Katherine B.Verified Buyer

01/18/26

Perfect post-workout snack

Clean ingredients, great protein content, and it actually fills me up. Tastes just like peanut butter but totally nut-free. Amazing!

Peanut Butter

David W.Verified Buyer

01/15/26

My kids love these too!

Safe for my son's nut allergy and he thinks they taste like candy bars. The chocolate chip one is his favorite. Finally a healthy snack the whole family can enjoy.

Chocolate Chip

Questions? We've Got Answers

Ready for Liftoff?

Subscribe for exclusive discounts, new flavors, and early access to drops.