Is soy milk healthy?
Soy milk can fit a healthy diet when it is unsweetened and fortified. The NHS lists fortified unsweetened soya drinks as a calcium source, and the FDA says fortified soy beverages are the plant drink counted in the dairy group. Plain unsweetened soy milk has about 38 kcal and 3.5 g protein per 100 g (USDA). Added sugar is the main thing to avoid.
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In this article
What do health agencies say about soy milk?
The NHS says fortified, unsweetened soya drinks are a good calcium source for people who eat a vegan diet, and that unsweetened soya drinks can be fortified with vitamin D and vitamin B12. It advises choosing lower-fat, lower-sugar options.
The FDA says fortified soy beverages are included in the Dietary Guidelines dairy group because they have key nutrients similar to those in milk. Other plant-based beverages are not currently included.
What is in a glass of soy milk?
USDA FoodData Central, per 100 g:
| Nutrient | Unsweetened, shelf stable | Sweetened, refrigerated |
|---|---|---|
| Calories | 38 kcal | 41 kcal |
| Protein | 3.55 g | 2.78 g |
| Fat | 2.13 g | 1.96 g |
| Carbohydrate | 1.29 g | 3.0 g |
| Calcium | 101 mg | 155 mg |
| Vitamin B-12 | 0.39 mcg | 1.33 mcg |
What should you watch for?
- Added sugar: the FDA says it can make it hard to meet nutrient needs within calorie limits, so choose products lower in it.
- Fortification: calcium, vitamin D and B12 are added by the maker, and amounts differ by brand. Read the Nutrition Facts label.
- Health claims: in the pages we opened, neither the NHS nor the FDA states that soy milk prevents or treats a disease, so we make no such claim.
This is general information, not medical advice. Ask a doctor or pharmacist about allergies, thyroid conditions or medicines.
What are the pros and cons of soy milk?
The NHS says that without dairy you may be at risk of not getting enough calcium, and that non-dairy products with added calcium can help. Soy milk can be one of those, but only if the label shows added calcium.
- Pro: unsweetened, calcium-fortified plant drinks such as soya count as dairy alternatives in NHS advice.
- Con: products differ. The NHS advises reading the nutrition information for fat, saturated fat, salt and sugar, and going for lower-fat and lower-sugar options.
- Con: sweetened versions carry more carbohydrate (see the USDA table above), so unsweetened is the safer default.
Is soy milk bad for you if you take thyroid medicine?
It may matter for timing. The US prescribing label for levothyroxine (LEVO-T) says certain foods can affect absorption and lists soybean flour, cottonseed meal, walnuts and dietary fiber as able to bind the drug and decrease its absorption. It also says to take the tablet once daily, preferably on an empty stomach, one-half to one hour before breakfast.
The label does not name soy milk as such, so we cannot say how much a glass changes absorption. If you take levothyroxine, ask your doctor or pharmacist when to have soy milk relative to your tablet.
People also ask
Is soy milk good for you every day?
The NHS counts unsweetened, fortified soya drinks within a healthy diet, and the FDA counts fortified soy beverages in the dairy group. Choose unsweetened and check the label; ask a doctor if you have a medical condition.
Does soy milk have calcium?
Unsweetened shelf-stable soy milk in USDA data has 101 mg calcium per 100 g and the sweetened refrigerated record has 155 mg. Amounts depend on the brand's fortification.
Is sweetened soy milk unhealthy?
The FDA says added sugars can make it harder to meet nutrient needs within calorie limits and suggests choosing products lower in them.
Is soy milk bad for you?
In the NHS and FDA pages we read, soy milk is not described as harmful; the points to watch are added sugar and whether it is fortified. People who take levothyroxine should ask a doctor or pharmacist about timing.
Does soy affect levothyroxine?
The FDA-posted LEVO-T label says soybean flour, among other foods, may bind levothyroxine and decrease its absorption, and advises taking it on an empty stomach before breakfast. It does not name soy milk.
Sources
- NHS: The vegan diet, read 5 Nov 2026
- FDA: Using the Nutrition Facts Label to Choose Milk and Plant-Based Beverages, read 5 Nov 2026
- USDA FoodData Central: Soy milk, unsweetened, plain, shelf stable (1999630) and sweetened refrigerated (2257044), via API, read 5 Nov 2026
- NHS: Dairy and alternatives in your diet, read 5 Nov 2026
- FDA (accessdata.fda.gov): LEVO-T (levothyroxine sodium) tablets prescribing information, read 5 Nov 2026
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