Sending vitamins in the mail during hot weather may be a concern for you. Can vitamins be damaged by heat? Yes, but not as much as some people think. Vitamins are not always affected by heat, but there are some circumstances in which they will be compromised. If you’re wondering whether you can send vitamins through the mail in summertime hot weather or if it’s better to just stick with cold shipping, then read on! We’ll discuss what happens when vitamins are exposed to heat and how you can avoid damage while still keeping them safe during shipment.

Can Excessive Heat Harm Vitamins?

It’s important to know that not all vitamins are created equal. Some vitamins are sensitive to heat, while others are more resistant. It’s also important to understand that there is no one-size-fits-all answer when it comes to sending vitamins through the mail during hot weather.

While other types aren’t as sensitive, unfortunately, some types of vitamins can be damaged by heat and light. This may mean they’re not safe for mailing during hot weather—or it could mean that they’ll need special packaging or extra care to make sure they arrive at their destination in good condition.

Examples of Sensitive Supplements

  • Vitamin C, Vitamin B1 and Pantothenic acid are all highly sensitive to damage by heat. 
  • Vitamin A, Vitamin B2 , Vitamin B6, Vitamin B12 and Folic acid. are all highly sensitive to damage by UV light and sunlight. 
  • Most fish oil products should be stored at room temperature, which should not be above 86°F.
  • Probiotics are delicate and cannot live above 120 °F, same as all bacteria and yeast.

A General Guide to Store Vitamins and Supplements

Vitamins are delicate and prone to damage in various ways. Heat, light and moisture can cause vitamins to deteriorate quickly. Oxygen, vibrations and high pressure can also contribute to vitamin loss.

To help protect your vitamins from these factors. The following are general guidelines:

  • Keep them out of direct sunlight as much as possible—especially if they’ll be stored for any length of time.
  • Use opaque containers when possible (not clear glass jars or plastic bottles). Glass jars will let light in through the sides; plastic bottles will let light through the lid unless it’s opaque as well.
  • Store them somewhere cool (but not cold) and dry—at a temperature between 50°F (10°C) and 70°F (21°C) with a relative humidity below 75%.

How to Protect Supplements from Heat During Shipping

You can take several steps to ensure that your supplement shipment arrives in good condition.

  • Use a cold pack or a cold pack and heat pack combo. Another way to ensure that your package stays cool during transport is by adding a small ice pack or gel pack inside the box with your vitamin shipments before sealing up everything tightly so that no moisture leaks into other items packed nearby. This will keep the temperature from rising inside the box as it travels through the mail. 
  • Use a heat-resistant box if possible, such as styrofoam or cardboard with an airtight seal on either end (but not plastic). This may be more expensive than bubble mailers, but it’s worth it for ensuring that your supplements arrive in good shape.
  • Use padded envelopes or bubble mailers instead of boxes if possible—this will help protect bottles from getting crushed during shipping and provide extra cushioning around fragile items like tablets and capsules so they don’t break open in transit. Consider using multiple layers of bubble wrap or other types of packing material around any fragile pills/capsules before putting them into an envelope so that there’s no risk of breakage during transport; also consider adding any smaller items inside larger bags before sealing up those bags so none gets lost when opening up packages later on down the road.

If you’re sending vitamins via USPS, it’s best to use a tracking number. If the mail carrier picks up your package, you can track its progress from the time of pick-up until delivery (or at least until it’s out for delivery). If there are any issues with getting your package delivered—whether because of heat damage or something else—then having this information on hand will help when filing claims against USPS or other carriers.

Alternative Shipping Solutions

  • A cold shipping service. If you live in an area with temperatures above 90 degrees, this is the safest option for vitamins shipped in warm weather. 
  • The USPS offers something called Priority Mail Express International, which guarantees overnight delivery to most countries and a cool temperature throughout the process. This type of shipping is more expensive than regular First-Class Mail International or Global Express Guaranteed purchases, but it’s worth it if you’re worried about your packages arriving safely.


As you can see, there are many options for shipping your vitamins during the hot weather. Sone shipping companies can often offer advice on their services according to shipping items and will be able to provide alternative shipping solutions if needed. It is also important that you understand what types of vitamins are most likely to be affected by heat or humidity so that you can choose the right packaging for them.

If you’re a business owner who ships supplements and vitamins in large quantities on a regular basis, Astro Asia can provide custom solutions for your shipping requirement. Need a thermal box, cold box or an insulated shipping blanket? Get in touch today for a custom quote.

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