Written by the Spacemilk team · Last updated October 2026

A dairy-free protein powder contains no milk or milk-derived ingredients. That rules out whey and casein, which are milk proteins. Good dairy-free options include soy, pea, rice and yeast protein. Check the ingredient list and the "Contains" statement, not just the front of the tub.

What makes a protein powder dairy-free?

Most popular protein powders are made from whey or casein. Both are proteins from milk. Even when they're filtered, isolated or made by a new process, they're still milk protein (FARE).

A dairy-free powder uses a protein source that never came from milk. It also leaves milk out of the flavorings, creamers and other added ingredients.

Is lactose-free the same as dairy-free?

No. This is the most common mix-up.

• Lactose is a sugar found in milk. Lactose intolerance is a digestive issue. Your small intestine has trouble breaking that sugar down.
• A milk allergy is an immune system reaction to milk proteins, such as casein and whey (NIDDK).

A product can have its lactose removed and still be made from milk protein. That might suit someone who is lactose intolerant. It doesn't suit someone with a milk allergy, a vegan, or anyone avoiding dairy for other reasons.

How common is trouble with lactose?

Very common. The NIH estimates that about 68% of the world's population has lactose malabsorption. In the United States, it's about 36% (NIDDK). Milk allergy is less common, but cow's milk allergy is the most common food allergy in infants and young children (FARE).

How do you spot dairy on a protein powder label?

Milk is one of the nine major food allergens in the US. Packaged foods must declare it, either in the ingredient list or in a "Contains" statement right next to it (FDA). If the label says "Contains: milk," the powder isn't dairy-free.

It also helps to know the ingredient names that mean milk:

Ingredient name	What it is
Whey, whey protein isolate, whey protein hydrolysate	Milk protein
Casein, caseinates (such as sodium caseinate)	Milk protein
Milk protein concentrate or isolate	Milk protein
Lactalbumin, lactoglobulin	Milk proteins
Lactose	Milk sugar
Butter, cream, ghee, yogurt, milk powder	Dairy foods

Based on FARE's list of milk ingredients to avoid.

Does "non-dairy" mean milk-free?

Not always. US rules let a food labeled "non-dairy" contain caseinate, a milk protein, as long as the ingredient list names its source, for example "a milk derivative" (21 CFR 101.4(d)). FARE also warns that non-dairy products may contain casein. The ingredient list is the part to trust.

What are the dairy-free protein options?

Each source has trade-offs. Protein quality is often measured with PDCAAS, a score with 1.0 at the top. A score of 1.0 means the protein supplies all nine essential amino acids in the amounts people need.

Protein	Dairy-free?	PDCAAS	One of the 9 major allergens?
Whey isolate (for reference)	No	1.00	Yes (milk)
Yeast protein (Spacemilk)	Yes	1.0	No
Soy protein isolate	Yes	0.98	Yes (soy)
Pea protein	Yes	0.89	No
Rice protein concentrate	Yes	0.42	No

Whey, soy, pea and rice values from Phillips, 2016, Nutrition & Metabolism, Table 1. Values vary by product and lab.

Soy

Soy protein isolate scores close to the top for protein quality. Soy is also one of the nine major allergens, so it doesn't work for everyone.

Pea and rice

Pea and rice are common in vegan blends. Each scores lower on its own, and they are often combined to round out the amino acids. Some people find plant proteins chalky or heavy. Our comparison of yeast protein vs pea protein goes deeper.

Egg white

Egg white protein is dairy-free, but it comes from an animal. Egg is also one of the nine major allergens.

Yeast protein

Yeast protein is isolated from baker's yeast, a single-celled fungus. It's a vegan complete protein, and it's neither dairy nor plant. Read more in our guide to yeast protein vs whey.

What else should you look for?

• Protein per serving. Look for a clear number, usually 20g or more.
• A complete protein. All nine essential amino acids, or a PDCAAS near 1.0.
• Sugar. Check the grams of added sugar on the Nutrition Facts panel.
• Other common allergens. If you avoid dairy because of allergies, you may be avoiding soy, gluten or nuts too. See our allergen-free protein powder guide.
• Ingredients that bother your stomach. Some people do better without gums or sugar alcohols. Our guide to protein powder for a sensitive stomach covers this.
• Published testing. Look for third-party test results you can actually read.

Some labels also carry a "may contain" or "made in a facility" note. If you have a milk allergy, ask the brand how it handles cross-contact, and talk with your allergist.

Where does Spacemilk fit?

Spacemilk Complete Protein is dairy-free and vegan. Each serving has 20g complete protein, with a PDCAAS of 1.0, and 0g sugar. It's free from all 9 major allergens: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soy and sesame. Every batch is tested for gluten, dairy, soy and peanuts. It's also formulated to be low in FODMAPs.

Yeast protein, the protein in Spacemilk, was shown in a 2024 double-blind randomized controlled trial to match whey for building lean muscle and strength in men over 40 doing resistance training.

Unflavored is one ingredient: yeast protein isolate. The flavored versions add konjac fiber (a fiber, not a gum), sunflower lecithin and Reb M, a sweetener fermented from rice. Most flavors also use thaumatin. Every batch is third-party tested, and you can match your lot code to its results on our testing page.

Who should check with a doctor first?

• You have a milk allergy or any food allergy, including a known yeast allergy. Ask your allergist before trying a new product.
• You have IBS or another digestive condition. A doctor or registered dietitian can help you choose.
• You're pregnant or breastfeeding.
• You have kidney disease or have been told to limit protein.
• You're choosing a protein powder for a child. Ask your pediatrician.
• You take medications that affect your diet.

This page shares nutrition facts and published information, not medical advice.

FAQ

Is whey protein dairy-free?

No. Whey is a protein from milk. Whey isolate and hydrolyzed whey are still milk protein.

Can I use whey isolate if I'm lactose intolerant?

It depends on the product and on how much lactose you tolerate. Whey isolate is still dairy, so it isn't an option if you have a milk allergy or avoid dairy. A doctor or dietitian can help you decide.

Is pea protein dairy-free?

Pea protein itself is dairy-free. Check the full label, since flavors and creamers can add milk ingredients.

Is Spacemilk dairy-free?

Yes. Spacemilk has no dairy or lactose in any flavor, and every batch is tested for dairy.

What is the most complete dairy-free protein?

Look for a PDCAAS of 1.0 or close to it. Yeast protein scores 1.0, and soy protein isolate scores close to it. Our guide to the PDCAAS protein quality score explains the scale.

Sources

• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Definition & Facts for Lactose Intolerance. niddk.nih.gov
• Food Allergy Research & Education (FARE). Milk allergy. foodallergy.org
• US Food and Drug Administration. FASTER Act: Sesame Is the Ninth Major Food Allergen. fda.gov
• US Code of Federal Regulations. 21 CFR 101.4, Food; designation of ingredients. eCFR
• Phillips SM. The impact of protein quality on the promotion of resistance exercise-induced changes in muscle mass. Nutr Metab. 2016;13:64. doi:10.1186/s12986-016-0124-8
• Briskey D, et al. Journal of Food and Nutrition Research. 2024;12(5):292–300. doi:10.12691/jfnr-12-5-9