Money Back Guarantee

We offer a 60 Day Money Back Guarantee for all orders placed directly with Master Supplements. If you are not 100% satisfied with your purchase, we encourage you to contact us to speak with one of our customer service representatives. If you purchased through a third party, please contact the retailer from whom you purchased.

To study the effects heat has on our products, we placed a bottle of Theralac in a 100 degree F temperature controlled environment for 14 days and determined that it remained above its guarantee. Therefore, it is our conclusion that 2-3 days spent in transit isn't enough time to irreparably damage the probiotic organisms within our supplements.

It is important to note that probiotics do not go bad or spoil like a carton of milk would in high temperatures. Our Totally Inert Packaging, which includes amber glass bottles, anti-oxygen and anti-moisture desiccant packets, a nitrogen flush, and a triple hermetic seal, to ensure optimum stability and freshness.

Additionally, to counteract any potential loss of viability from improper storage, we blend our probiotics with vast overage in bacterial counts to guarantee that we can deliver the full listed potency throughout the entire two-year shelf life.

With 15 years of third party testing and experience shipping worldwide, we 100% guarantee potency through expiration when our products are shipped without an ice pack.

Absolutely! Take a bottle on your next trip and place it in the refrigerator or a cool, dark place upon arriving at your destination.

Totally Inert Packaging (TIP) is our multi-step approach to ensuring guaranteed potency through expiration for all of our probiotic supplements.

We take these steps because it's important to minimize exposure. Because probiotic bacteria are living organisms, they have the same requirements for life as you or I -- without oxygen and water, probiotics cannot grow.

Most probiotic bacteria have been freeze dried during production to keep them in metabolic stasis. As we introduce moisture and oxygen, the once dehydrated probiotic bacteria wake up and begin reproducing or colonizing.

You want the probiotic bacteria to grow and colonize in your gut, not on the shelf.

Therefore, preventing the ingress of moisture and oxygen during storage is essential to ensure that your supplements remain potent through their expiration date

Packaging Probiotics:

After encapsulation, we pour our probiotic capsules into a glass bottle. We specifically use brown glass bottles for two reasons:

They block UV lightThey allow less external moisture contamination

Probiotic bacteria are as sensitive to UV radiation as you or I and amber glass bottles block more UV light than clear, green, or blue glass bottles. Additionally, glass bottles have a lower moisture-vapor transmission rate. What this means is that water can more readily pass through a plastic packaing barrier and increase the relative humidity inside a plastic bottle.

Next, we add moisture and oxygen dessicant packets followed up by a pure nitrogen flush of the inside of each bottle.

These packets absorb whatever leftover excess oxygen and moisture remaining inside the product after we flush the bottles with pure N2. By minimizing the oxygen and moisture content, we can guarantee that the probiotics within will remain inert until you're ready to start taking them!

Lastly, we apply a double seal complete with another set of moisture and oxygen barriers to finish our TIP process. 

By limiting their exposure, we can guarantee that our supplements will remain stable and potent through expiration.

We provide same day shipping for all orders placed before 3:00 P.M. Central Time. We ship using USPS Priority Mail so your order will arrive as quickly as possible. Typically, shipments arrive within 2 - 3 days.

During the holiday season, postal carriers see a massive increase in volume which may lead to delays.

We provide tracking information for all accounts that have an associated email address so you can keep tabs on when your supplements are scheduled to arrive. If you do not see this email, check your spam folder.

If you wish to have your order shipped via UPS or have another special request, such as C.O.D., please call Customer Service to place your order. We're happy to ship internationally however additional shipping charges may apply.