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Can people with lactose intolerance drink soy milk?

Quick answer

Yes, in USDA data unsweetened soy milk contains 0.0 g of lactose, the sugar people with lactose intolerance cannot digest well. Cow's milk has about 5 g per 100 g. Check the label for added calcium, and ask a doctor or dietitian about milk alternatives.

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In this article
  1. Does soy milk have lactose?
  2. How much lactose is in cow’s milk?
  3. Should you check calcium?
  4. Who should ask a doctor?

Does soy milk have lactose?

The USDA FoodData Central Foundation entry for unsweetened, plain, shelf-stable soy milk lists lactose at 0.0 g per 100 g. Lactose is the milk sugar that people with lactose intolerance have trouble digesting.

How much lactose is in cow’s milk?

USDA lists 5.2 g lactose per 100 g in 1% milk and 5.05 g in whole milk. A cup weighs 244 g, so 1% milk has about 12.7 g lactose per cup (our calculation).

Drink (USDA) Lactose per 100 g Calcium per 100 g
Soy milk, unsweetened 0.0 g 101 mg
1% milk 5.2 g 125 mg
Whole milk 5.05 g 113 mg

Should you check calcium?

The NIDDK says avoiding milk and milk products may lower your calcium and vitamin D intake, and suggests checking you get enough. It lists labels showing added calcium, such as some cereals, fruit juices and soy milk, as options. Calcium in soy milk varies by brand, so read the label.

Who should ask a doctor?

The NIDDK page advises asking a doctor or dietitian about choosing a milk alternative. We did not read anything on soy allergy here, so if you suspect one, ask a doctor.

People also ask

Can lactose intolerant people drink soy milk?

USDA lists 0.0 g lactose in unsweetened soy milk. Ask a doctor or dietitian about choosing a milk alternative.

Does soy milk contain lactose?

No, the USDA Foundation entry for unsweetened plain soy milk shows 0.0 g per 100 g.

Is soy milk a good calcium source if I avoid dairy?

The NIDDK names soy milk with added calcium as one option. USDA lists 101 mg per 100 g for one unsweetened product, so check the label.

General information only, not medical advice. If you have a health condition or are pregnant, ask your doctor before changing what you drink.

Sources

  1. USDA FoodData Central: Soy milk, unsweetened, plain, shelf stable (FDC 1999630), read 5 Nov 2026
  2. USDA FoodData Central: Milk, lowfat, fluid, 1% milkfat (FDC 170872), read 5 Nov 2026
  3. NIDDK: Eating, Diet, & Nutrition for Lactose Intolerance, read 5 Nov 2026
Written by Drinks Type Editorial Team · Published Aug 20, 2025 · Updated Nov 5, 2026
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