Can You Microwave Milk? (Yes! Safety Tips & 5 Materials to Avoid)

You’re craving a latte or hot chocolate, but don’t want to wait for your milk to heat up on the stove. Is there a quicker alternative? Can you microwave milk instead? Yes, you can successfully and safely heat milk in the microwave by using the correct technique and making sure your container is microwave safe.

Let’s discuss hot milk safety tips and five common containers to avoid while microwaving.

Can you microwave milk?
Can you microwave milk? Yes!

Is it safe to microwave milk?

Yes, you can microwave milk safely if you are using the right technique. Overheating milk can cause it to scorch or develop a thin protein film on the surface, negatively affecting taste and texture.

The keys to perfect microwaved milk are low power and a close eye. When heated on 100% high power, you risk burning or scorching the milk. Once this happens, you can’t amend it.

Overheating milk can also result in a thin “skin” or protein film on the top of the milk. This can be stirrred away, but the texture will be negatively affected.

Let’s look at the proper technique for heating milk in a microwave.

How to heat milk with a microwave the right way?

When you are heating milk in the microwave, it is important to keep the temperature low. Don’t heat at 100% power, choose 60-70% depending on your microwave. Higher-wattage ovens will heat higher and quicker than lower-wattage ones.

Don’t overfill your container. Milk tends to “grow” as it heats up. You risk the milk overflowing if you fill it to the top of the container. Leave room for expansion, so you save a messy clean up later.

Since you are trying to avoid scorching and protein film, check on your milk every 15 seconds until it reaches the desired drinking temperature. Give it a stir each time to distribute the heat evenly.

Follow these steps for hot milk perfection:

  • Pour milk into a microwave-safe container with room for expansion.
  • Set the temperature at medium-high or 60-70% power.
  • Check the milk and stir every 15 seconds until the desired temperature is reached.
  • Continue just until steam starts to form.
  • Remove carefully from the microwave and enjoy!

NOTE: The right temperature should be achieved within 45-90 seconds, depending on your microwave.

How long to heat milk in the microwave for hot chocolate?

Hot chocolate is a sweet, warm treat on a cold day. The microwave can speed up the process. When making hot chocolate in the microwave, you can either add the cocoa and other ingredients like cinnamon and sugar part way during the heating process or mix it once the milk is heated and taken out of the microwave.

When you add in the ingredients in the middle of the heating process, the process may take a little longer. You can expect your hot cocoa to be done in 60 to 90 seconds.

Adding ingredients halfway into heating is a good option because it ensures even mixing. If you choose to add ingredients after heating, a milk frother can aid in mixing.

Quick, microwaved hot chocolate.
Quick, microwaved hot chocolate. Yum!

How safe is microwaved milk?

Microwaving milk is considered safe with a few exceptions. Cow’s milk is fine for the microwave, but raw milk or baby formula or breast milk is not recommended to be heated this way.

The cow’s milk you buy in the grocery store is pasteurized. The process of pasteurization heats up raw milk in order to kill germs and bacteria that could make you sick. Pasteurization is a delicate process where temperatures have to be watched closely. When you attempt to microwave raw milk, you aren’t in control of the temperature and it is difficult to heat evenly.

Can you microwave raw milk or baby milk?

Infant formula or breast milk is not recommended to be heated in the microwave because “hot spots” can form. These are due to uneven heating and can burn a baby’s mouth and esophagus.

You can also reheat milk in the microwave if you get interrupted and don’t finish that latte. Just make sure that it has not exceeded the two hour safety mark at room temperature. If it has, bacteria can start to grow.

Can you heat soy milk in the microwave?

Plant-based milks are all the rage: soy, rice, oat, coconut, and almond. These are great options for those allergic or trying to avoid dairy. The good news is that they can also be safely and successfully heated in the microwave following the same gradual heating guidelines.

Soy milk has the tendency to curdle, and oat milk can separate because of the high starch content, so heat slowly and stir often to avoid these issues.

Does milk lose nutrients when heated in the microwave?

Milk does a body good, but does it lose vital nutrients in the microwave process? The safety of microwaves, in general, is a hot topic, but extensive research has been done on the effect of heating and nutrient loss.

A study published in the Journal of Dairy Research studied the effects of vitamin loss. The research revealed that heating milk in the microwave oven does not take away vitamins such as A, B1, B2, B6, and E.

Similar results were found in another research study that was published in the Journal of Agricultural and Food Chemistry. This study compared the balance of minerals in microwave-heated milk versus milk heated in a water bath. Heating in the microwave did not show any significant changes to the milk.

Which materials are safe to use in a microwave oven?

Most foods and drinks can be heated in the microwave, but certain containers can pose a problem. They can leach unwanted chemicals into food, melt or even start a fire.

Here’s a list of popular microwave-safe containers and cooking aids:

  • Microwave safe dinnerware, but do not use if the dishes are chipped or cracked.
  • Heat-resistant glassware, but make sure it does not have metallic parts. Also, avoid using glass jars if they are chipped or cracked.
  • Microwave-safe BPA-free plastics.
  • Microwave-safe plastic wraps.
  • Oven-safe cooking bags. Follow manufacturer instructions, vent to let steam escape, and make sure they don’t have metal ties.
  • Microwave-safe food thermometers.

What should you avoid in the microwave oven?

Even though most home kitchens are stocked with handy containers, a few should never cross the door of your microwave due to spark, fire, and melt hazards.

Avoid using the following objects in a microwave:

1. Paper bags

While microwave popcorn bags are okay to use, most paper bags should not be used in a microwave. They can emit toxins and fumes when heated and can even catch on fire.

2. Aluminum foil

The interior of a microwave oven is made of metal which enables it to work as a mirror. Microwaves emit electromagnetic energy to warm up items. When you place metal inside, the waves tend to reflect off of it, resulting in sparks and a possible fire. This can also destroy the operation of your microwave.

3. Travel mugs

Travel mugs are often made of stainless steel, which should never be placed in the microwave for the same reason as aluminum foil. Many plastic travel mugs shouldn’t be microwaved either. Always look at the enclosed instruction card or the bottom of the cup to determine if it is microwave safe. Plastics can contain a chemical called bisphenol A (BPA) which is a known endocrine disruptor. Cups containing this should not be heated.

4. Styrofoam cups or takeout boxes

Styrofoam cups and boxes contain chemicals that can leach into drinks and food. If heated for too long they can even melt. Packing manufacturers even warn against microwaving paper containers because some are coated

5. Butter or yogurt containers

Yogurt and empty butter cups can be handy to store leftovers in the fridge, but they shouldn’t be microwaved. They are typically made of thin, cheap plastic that is intended for single use. These containers cannot stand high temperatures, so using microwaves to heat them is not a smart decision.

You shouldn't microwave certain containers
There are certain materials you shouldn’t microwave.

Important microwave safety tips

Using a microwave for your hot milk drink can be a timesaver, but always follow microwave safety:

  • Make sure that you only use microwave-safe containers.
  • Ensure that the door is closed when operating.
  • Clean your microwave oven using water, mild detergent, and a soft sponge. Old food particles can contaminate food.

Summary of “Can you microwave milk?”

You can safely heat milk in the microwave for your favorite warm drink or hot chocolate. Using proper containers, reducing the cook power, allowing room for expansion, and heating at 15-second intervals will ensure your beverage is heated through and tasty.


Can you microwave milk?

Yes, you can microwave milk. Reduce the cooking power to 60-70% and cook at 15-second intervals to avoid scorching or curdling.

Can you reheat milk in the microwave?

Yes, you can safely reheat milk in the microwave as long as it hasn’t exceeded its room temperature limit.

Can you microwave baby milk?

No, it is not recommended to microwave baby milk, whether formula or breast milk. Microwaves do not heat evenly, so “hot spots” can burn a baby’s mouth.

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