Oat Milk: Nutrition, Added Sugars, Gluten and How It Compares to Milk

Oat milk is a plant-based drink made by blending oats with water, usually breaking down the oat starch with enzymes and then straining out the solids. Its nutrition depends almost entirely on the brand: protein is generally low, some of the carbohydrate is sugar formed during processing, and calcium, vitamin D and vitamin B12 are present only if the maker adds them. The USDA database we use for food articles has no oat milk entry, so this guide shows the nearest USDA entries, explains how to read an oat milk label, and covers how oat milk compares with dairy milk and other plant drinks.

Peptide Labs does not sell oat milk or other plant drinks. This article is general nutrition information, not medical advice.

Oat milk nutrition: what USDA data can and cannot tell you

We build our nutrition tables from the USDA FoodData Central SR Legacy database. It does not contain an oat milk or oat beverage entry, so we will not invent one. The table below shows the closest USDA entries for other milks and plant drinks, per cup, so you have a reference point when you hold an oat milk carton. None of these rows is oat milk. Percent Daily Values use the FDA Daily Values printed on Nutrition Facts labels.

Two patterns in that table matter for oat milk too. First, the plant drinks other than soy are low in protein compared with cow’s milk. Second, their calcium, vitamin D and B12 come from fortification, so two cartons of the same type can differ widely. Rice milk is the other grain-based drink in the database; it shows how a drink can list sugars even when labeled unsweetened. Whole oats themselves are a fiber-rich grain (see our oats guide), but a strained drink does not carry the nutrition of a bowl of oatmeal, so the Nutrition Facts panel is the only reliable source.

How oat milk is made, and where the sugar comes from

Oat starch on its own would make a thick, bland drink. Manufacturers typically add enzymes called amylases to the oat and water mix, which split the starch into smaller sugars, mainly maltose and glucose. An early Oatly patent (US 6,451,369) describes this enzyme step producing a maltose-rich oat drink. The result tastes slightly sweet without any added sweetener.

That sugar has caused labeling disputes. In 2019, Campbell Soup Company’s Pacific Foods challenged Oatly’s “no added sugars” advertising for its unsweetened oat drink at the National Advertising Division of the Better Business Bureau, arguing that sugars created by breaking down oat starch should count; Oatly agreed to stop using the claim in advertising, according to FoodNavigator-USA. For shoppers, the practical point is simple: read the Total Sugars and Added Sugars lines rather than relying on front-of-pack wording. If you watch carbohydrates, our guide to low glycemic foods explains why the form of a food matters.

Does oat milk keep the oat fiber?

Oats are known for a soluble fiber called beta-glucan, and FDA allows a heart health claim for oat soluble fiber under 21 CFR 101.81, but only on foods that meet that rule’s conditions. Some oat drinks mention beta-glucan on the carton and many do not. If the label lists dietary fiber in grams, that is what the drink provides; do not assume it matches whole oats.

Oat milk vs milk and other plant drinks

The comparison of oat milk vs milk comes down to protein and what is added. Cow’s milk naturally supplies protein, calcium, potassium, riboflavin and B12, and the USDA 2% milk entry includes added vitamin D. The Dietary Guidelines for Americans 2020-2025 state that almond, rice, coconut, oat and hemp “milks” are not included in the dairy group because their overall nutrition is not similar to dairy milk, and that among plant-based milk alternatives only fortified soy beverage is currently considered a dairy equivalent. Our soy milk guide covers that drink in detail.

The FDA has also weighed in. Its February 2023 draft guidance on plant-based milk alternatives, which names oat among the plant sources, recommends that products called “milk” whose nutrients differ from cow’s milk carry a voluntary statement such as “contains lower amounts of” a nutrient than milk. It is still a draft, so you may or may not see that wording on a carton.

• Protein: check the grams per cup; if oat milk replaces milk in your day, protein may need to come from elsewhere (see high protein foods).
• Calcium and vitamin D: look for both on the Nutrition Facts panel; our guides to calcium-rich foods and vitamin D foods list other sources.
• Vitamin B12: plants do not supply it, so it is present only when added; see B12 foods.
• Lactose: oat drinks contain no lactose, which is one reason people choose them; our lactase guide covers the dairy side of that question.

Is oat milk healthy? How to read the label

Is oat milk healthy? It can fit a balanced diet, but it is not a nutritional copy of milk, and products vary more than most people expect. A quick label check covers the main differences:

1. Added Sugars: compare original, unsweetened and flavored versions; flavored and barista styles often differ.
2. Fortification: look for calcium, vitamin D and vitamin B12 with a percent Daily Value.
3. Protein: most oat drinks list far less than the 8 grams per cup of dairy milk in USDA data.
4. Fat source: some brands list a vegetable oil in the ingredients, which adds calories.
5. Additives: gums and stabilizers keep the drink smooth; our guides to xanthan gum and carrageenan explain what the research says about common ones.

Is oat milk gluten free?

The FDA gluten-free rule does not count oats as a gluten-containing grain, but oats are often grown, milled or processed alongside those grains, so cross-contact is common. An oat drink labeled gluten-free must meet the FDA gluten-free rule of less than 20 parts per million gluten. If you have celiac disease or another reason to avoid gluten, choose products labeled gluten-free and talk to your clinician about whether oats suit you. Our oats guide covers this in more depth.

Who should be careful with oat milk

• Babies: the Dietary Guidelines say plant-based milk alternatives should not be used in the first year of life to replace breast milk or infant formula. Ask your pediatrician before using any plant drink for a young child.
• People managing blood sugar: oat drinks carry carbohydrate and sugars, so the label matters; follow the plan you agreed with your care team.
• People avoiding gluten: look for a gluten-free label, as explained above.
• Allergies: oats are not one of the nine major food allergens, but flavored or blended drinks may include other ingredients, so read the full ingredient list.

Coconut drinks raise different questions, mainly about saturated fat; our sibling guide to coconut milk compares canned coconut milk with the carton drink.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed October 2026.

Related guides: Coconut Milk Nutrition: Canned vs Carton, Saturated Fat and Allergy Facts, Soy Milk: Nutrition, Fortification and Soy Milk vs Milk, Oats Benefits: USDA Oatmeal Nutrition, Beta-Glucan and the FDA Claim, Rice Milk: Nutrition, Arsenic Advice and Is It Healthy?.