What Happens If You Drink Expired Almond Milk?

By: Kelly Barlow

The concrete answer is this: drinking expired almond milk can make you sick if it has spoiled, since harmful bacteria or mold can grow once it passes its safe shelf life. In mild cases, you might experience nothing at all, especially if it was just slightly past its “best by” date and stored properly. But in more serious situations, drinking spoiled almond milk can lead to nausea, stomach cramps, diarrhea, or even food poisoning.

Unlike some shelf-stable foods, almond milk (both refrigerated and shelf-stable varieties) is highly perishable once opened, like mayonnaise. That means paying attention to dates, storage conditions, and sensory cues like smell and texture is the best way to protect your health.

Almond milk is primarily water blended with ground almonds, sometimes fortified with vitamins, minerals, and stabilizers. While it doesn’t contain dairy, it still provides an environment where bacteria can thrive once exposed to air.

The proteins, natural sugars, and added nutrients become food for microbes, especially if the milk is stored improperly or left open too long. Shelf life depends on whether the product is refrigerated from the start or shelf-stable before opening.

Type of Almond Milk Typical Shelf Life (Unopened) Shelf Life After Opening Key Storage Notes
Refrigerated (carton) Until the “use by” date (7–10 days from purchase) 7–10 days Must stay refrigerated at all times
Shelf-Stable (tetra pack) 6–12 months (unopened) 7–10 days Can be stored at room temperature until opened
Homemade Almond Milk 3–5 days N/A Highly perishable, should always be refrigerated

Signs That Almond Milk Has Gone Bad

The most important way to know if almond milk is safe is to check its appearance, smell, and taste. Expiration dates are guidelines, but actual spoilage can happen faster if the milk was not stored correctly.

Sign What It Looks Like What It Means
Sour or off smell Strong, unpleasant odor (similar to sour dairy milk) Spoilage has occurred
Curdling or lumps Separation into clumps, unusual thick texture Spoiled due to bacterial growth
Color change Grayish or yellow tint Product is no longer fresh
Off taste Sour, bitter, or tangy taste Unsafe to drink
Bloated packaging Carton feels swollen or bloated Possible bacterial fermentation

If any of these signs are present, the almond milk should not be consumed.

Health Risks of Drinking Expired Almond Milk

A carton of almond milk placed inside an open refrigerator
Some people may feel weak symptoms or no symptoms at all

The severity of the health effects depends on how spoiled the almond milk is and how sensitive the person’s digestive system might be. While some people may feel only mild discomfort, others may face stronger symptoms.

Possible Effect Explanation
No noticeable reaction If consumed just past the best-by date and still safe, no reaction may occur
Mild digestive upset Bloating, gas, or mild stomach discomfort due to a slight bacterial presence
Food poisoning symptoms Nausea, vomiting, diarrhea, and stomach cramps caused by spoiled milk
Allergic-type response In rare cases, mold growth could trigger reactions in sensitive individuals

For young children, the elderly, or people with weakened immune systems, the risks are higher and can lead to more serious illness.

Differences Between “Best By,” “Use By,” and Actual Spoilage

Almond milk containers often display “best by” or “use by” dates, which can be confusing.

Label Term Meaning Safety Implication
“Best By” date The period when the product tastes freshest It can be safe for a few days after, if stored correctly
“Use By” date Manufacturer’s recommended cutoff for safety and quality Should be followed strictly for refrigerated varieties
Actual spoilage Determined by smell, taste, and appearance, regardless of date Never consume if spoiled signs are present

What To Do If You Accidentally Drink

A woman sipping almond milk from a glass
If you feel bad, visit a doctor immediately

If you drink almond milk and later realize it has expired, the next steps depend on whether it was actually spoiled.

Scenario What To Do
Slightly past “best by” date, no spoilage signs Likely safe—monitor for any digestive discomfort
Mild sour taste, small amount consumed Drink water, avoid heavy foods, and monitor symptoms
Spoiled milk with a sour smell/taste, larger amount consumed Expect possible stomach upset; rest and hydrate
Severe symptoms (vomiting, diarrhea, cramps, fever) Seek medical attention, especially for children or the elderly

Preventing Going Bad

@keepingthepeas

How to Freeze Almond Milk: If you have extra almond milk you dont want to go to waste freeze it! Defrost in the fridge, then blend for 20-30 seconds. Almond milk separates after it defrosts. #almondmilk #cookingtips #howtofreeze #freezingfood #vegantips

♬ Blue Blood – Heinz Kiessling

Prevention is the simplest way to avoid the risks of expired almond milk.

Tip Why It Helps
Keep refrigerated milk cold Prevents bacterial growth
Refrigerate immediately after opening shelf-stable milk Extends safety window
Seal the carton tightly Prevents contamination from other foods
Store on refrigerator shelf (not door) More stable temperature
Consume within 7–10 days after opening Ensures freshness and safety

Homemade almond milk should always be consumed within 3–5 days, since it lacks preservatives.

Final Thoughts

The bottom line is clear: drinking expired almond milk can range from harmless to harmful, depending on how spoiled it is. If it’s only slightly past its “best by” date and shows no signs of spoilage, the risk is low. But if it smells sour, looks curdled, or tastes off like a bad cheese, it should never be consumed. The potential for food poisoning is not worth the risk, especially since almond milk is affordable and easy to replace. Paying close attention to dates, storage conditions, and sensory cues ensures you enjoy almond milk safely without worrying about health consequences.