The use of probiotics in veterinary practice settings is becoming increasingly common for pets with a variety of medical conditions. If you use probiotics for yourself, you may notice that most of the reputable probiotic products are found in the refrigerated section of your local health food or grocery store. Why, you may ask? The active component found within any probiotic is the actual living bacterial strain or strains. The secret many probiotic companies don’t like to discuss is that most probiotic bacteria will die if they are exposed to excessive heat. Even long-term exposure to room temperature conditions will adversely impact most probiotic strains.
Should veterinary probiotics be shipped and stored cold - is this really necessary?
The key to the beneficial impact of these products is that the bacteria need to be alive. It is for this reason that stores like Whole Foods have dedicated refrigerators just for their probiotic products for humans. Veterinary probiotics are no different and should also be stored under controlled refrigerated conditions.
Two of the leading veterinary products on the market both claim to be “shelf stable.” One of the most commonly used probiotics in the veterinary field has a package notification instructing the user to “Store at room temperature, not to exceed 77°F and out of direct sunlight.” The risk in giving pets probiotics which are stored at “room temperature” is that you will have no idea how the heat may have impacted the viability of the bacteria while on the shelf, or more importantly, during the shipping process. Even if your air-conditioned office is cool enough for storage of some probiotics, the temperatures associated with distribution and shipping these products to many areas throughout the country are likely to damage them.
Temperature exposure to packages sent by common carriers like UPS, FedEx, and the US Post Office will vary greatly depending on the time of year and geography. For example, a probiotic shipped by UPS in January from Detroit to Chicago is unlikely to be exposed to excessive heat in transit. However, a probiotic shipped during the summer months, or to southern parts of the country, is going to be much more at risk.
One study (Shallenberger, et al. 2015) analyzed the variable temperature exposure of certain medical packages shipped from Montana to six “warm climate” U.S. Cities (Phoenix, Tampa, New Orleans, Los Angeles, El Paso, Dallas) using variable shipping carriers and methods (2-day air, Next Day Air). Throughout August and September, three major U.S. carriers (FedEx, UPS, USPS) transported 72 individual shipments. The products were shipped without any form of insulation or cooling source.
The results showed that products shipped in warmer months, with no external cooling or insulation, will be exposed to high ambient temperatures. More relevant for the issue of shipping probiotics is that the data also show that packages were routinely exposed to temperature “spikes” when placed on planes or local delivery trucks. These temperatures spikes often exceeded 104°F (40°C), which are temperatures that will quickly kill even hearty probiotic bacteria. During the course of the study, the 72 packages recorded internal maximum temperatures ranging from a low of 76°F (24.6°C) to a high of 118°F (47.9°C). From this data, we can easily conclude that if probiotics are shipped without a cooling source and insulation, particularly in the warmer parts of the US, it is likely they will be compromised in shipping and rendered useless for the patient.
How should veterinary probiotics be shipped and stored to ensure potency?
While there are dozens of probiotics products available in pet supply stores and online, only a handful of products are actively being utilized in veterinarian offices. The safest way to ensure that these products have not been compromised in the storage or transportation process is to choose a product which is stored and shipped under controlled, refrigerated conditions. When one considers the potential impact of temperature spikes during the shipping supply chain, the shipping issue should be of particular concern to the veterinarian utilizing probiotics for pets with serious gastrointestinal disorders.
ExeGi Pharma is the maker of the Visbiome Vet high potency probiotic, which is an 8-strain probiotic blend administered to pets in doses of 112.5 to 450 billion live bacteria per dose. The bacterial counts in this product are more than 10X the nearest competitor and the high bacterial counts are believed to contribute to the product effect. This product must be stored under refrigerated conditions at the veterinarian’s office. ExeGi ships the Visbiome Vet product via 2-Day Air express service using 1.5-inch-thick Styrofoam coolers with two frozen gel cold packs. The purpose of including insulation, cooling components, and express delivery with orders is to ensure that the product is not exposed to elevated temperatures.
The Visbiome Vet strains can be exposed to warm conditions for brief periods of time and are even stable at room temperature for up to a week. Unfortunately, temperature spikes above 86°F will begin to degrade the living bacteria, a phenomenon potentially present in competing products.
As an added assurance of product integrity, ExeGi adds a temperature monitoring device to every shipment. If the product is exposed to unacceptable temperature ranges, even for a short period of time, the monitor will be activated and turn red. In the unusual event that this occurs, the manufacturer will replace the product free of charge. The inclusion of these temperature monitors is so important that, in addition to including these measures in their own shipment, the manufacturer also requires any third-party internet retailers of the product to use the devices, insulation, and gel packs in their shipping process (example- www.vetrxdirect.com).
In conclusion, probiotic bacteria are sensitive to heat, and reputable makers of human probiotics have shifted to a “Cold-Chain” storage and shipping method to protect their products before they are taken. This shouldn’t be any different for pets, especially those experiencing GI distress. Today, Visbiome Vet is one of the major probiotic brands being used in the veterinary field which is properly controlled for temperature exposure both during long term storage and shipping of the product. Ideally this will become industry standard, but for the meantime, it is crucial to be aware of which probiotics have their integrity protected from the heat and which do not.
- Probiotics for pets should contain viable living bacteria in colony forming unit counts high enough to alter the gut flora.
- Probiotic bacteria can be inactivated by excessive temperatures, which are common for packages delivered by major carriers such as FedEx, UPS and USPS.
- Any probiotic product shipped via FedEx, UPS and USPS during the summer months to the southern part of the U.S. is likely to be exposed to temperature spikes which could inactivate probiotic bacteria
- The Visbiome Vet brand is shipped using insulated coolers, gel cold packs, standard 2-day express shipping, and temperature monitoring device to ensure product integrity.
 Schallenerger, et al. The effect of temperature exposure during shipment on a commercially available demineralized bone matrix putty. Cell Tissue Bank (2016) 17:677-687
 White et al. Randomized, controlled trial evaluating the effect of multi-strain probiotic on the mucosal microbiota in canine idiopathic inflammatory bowel disease. Gut Microbes. 2017.