How To Help Keep Your Insulin (and Other Diabetes Meds) Cool
Key takeaways:
- Temperature-sensitive medication exposed to extreme heat or freezing can degrade – even if it looks normal – and lead to unpredictable results.
- Store these medicines in the refrigerator until they're ready to be used. Insulin can be stored at room temperature for a month and diabetes and weight loss drugs for about three weeks.
- Protect insulin with thermal bags, portable cooling cases, or smart temperature monitors that send alerts to your phone if temperatures go outside the safe range.
With summer approaching, it's a perfect time to consider how to protect your insulin and other medicines so they work as they should.
That’s why taking a few precautions now can avoid damage caused by heat – including unpredictable blood sugar levels.
There are a number of simple and inexpensive ways to protect your medications so you can get outdoors, travel, or just relax in the sun.
Why keeping insulin cool matters
If you’ve ever left insulin in a hot car, you might have noticed it turning cloudy. Similarly, if it freezes, crystals or particles may appear. In both cases, the insulin shouldn’t be used. Even if it looks normal, insulin exposed to extreme heat or cold can degrade, leading to unpredictable blood sugar swings.
Insulin is a protein made up of molecules arranged in a specific order. It travels through the bloodstream and acts like a key, binding to insulin receptors — special proteins on the surface of cells that act like locks. When everything is working properly, these receptors open cells to allow glucose to enter and be used for energy.
But when insulin is exposed to extreme heat or cold, its molecular structure can change, making it less effective at doing its job. In other words, the key no longer fits the lock properly.
Taking care of insulin at home
At home, insulin is best kept in the refrigerator until it’s time to open it. The American Diabetes Association (ADA) recommends storing insulin that is not being used in the fridge at temperatures between 36 and 46 degrees Fahrenheit.
Fluctuating temperatures can reduce the effectiveness of insulin, leading to unpredictable effects and reducing your time in range. Studies have found that the temperature in refrigerators can vary widely.
So, while the butter compartment or refrigerator door shelves may seem like good spots for insulin, frequent opening and closing can cause those areas to run warmer than the main compartment. Similarly, the bottom shelves and drawers often run colder – sometimes cold enough to freeze insulin, rendering it ineffective.
Some have recommended storing insulin on the middle shelf of the fridge. However, with temperature variations across different refrigerator models and sections, researchers have expressed hesitancy to suggest the ideal spot. If you're worried about fluctuations, consider a wireless thermometer ($20-$40 online) that connects to your smartphone and sends alerts if temperatures go outside the range you set.
Some people find that injecting cold insulin can be painful, so you can let it warm to room temperature before using. The ADA says it's fine to keep insulin at between 59-86 degrees Fahrenheit for about a month.
How to store other diabetes medications
If you're using other diabetes or weight loss medicines that need refrigeration, such as a GLP-1 agonist like Ozempic or a dual-agonist like Mounjaro, the storage recommendations are very similar to those for insulin.
Keep them in the fridge, stored at between 36 and 46 degrees Fahrenheit, until you're ready to use them. The room temperature recommendations are slightly shorter for these medicines compared to insulin. Once in use, you can store them at room temperature (up to 86 degrees Fahrenheit) for up to 21 days, compared to about a month for insulin pens or vials.
The medicine should always be clear and free of particles. As with insulin, keep them out of direct sunlight, never freeze them, and discard immediately if they do freeze.
How to beat the heat
Instead of leaving medication in places that can get very hot or cold, like the glove box of a car, try an insulated container you can keep with you to maintain a safe temperature. There are plenty of flexible and convenient options available.
Portable thermal bags that contain reusable gel packs are easy to find online and typically cost less than $20. The gel packs or the entire container are set in a freezer for a set number of hours (for example, overnight), then stay cold for a day or more.
For road trips, a cooler with medication kept in a watertight container will do the job. Just keep a buffer between the ice and your insulin.
The wireless thermometers previously mentioned can also be helpful for travel and can be placed in the container holding your medication. Look for ones that send a notification to your smartphone if the temperature falls outside of the manufacturer's recommendation.
Some portable cases, like those from FRIO ($27 to $39), use evaporative cooling to maintain a safe temperature.. You can find ones that are ideally sized for the number of insulin or auto injector pens or vials you want to carry. Some are as small as a wallet – and they can last five times longer than a regular reusable ice pack.
For those who use injector pens, the VIVI Cap ($169) will protect them from extreme temperatures and track doses via smartphone. The device uses a layer of thermal insulation and an additional layer of material that absorbs heat, keeping it away from the insulin. The company says the device will keep medication safe to use in 100-degree heat for up to five days.
The bottom line
Protecting your insulin or other temperature-sensitive medications is important to maintain their potency.
Exposure to extreme heat or cold can damage medications like insulin and GLP-1 drugs, leading to unpredictable results or reducing their effectiveness. If your medication looks cloudy, has floating particles, or was frozen or overheated, it may no longer be safe to use and should be discarded.
There are a number of inexpensive ways to keep your medicine cool when you're on the go. These include simple thermal containers with packs you freeze to evaporative cooling devices that protect insulin from extreme temperatures.
A little planning for hot weather or when traveling can ensure your insulin stays safe, so you can keep the focus on summer fun.
Learn more about keeping insulin safe in challenging conditions here: