Frequently Asked Questions | Master Supplements

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Absolutely! Take a bottle on your next trip and place it in the refrigerator or a cool, dark place upon arriving at your destination. If either of those isn't an option, consider taking as many capsules as you think you'll need in a pill box or check out our Travel Packs!
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 product specialists to discuss your options. If you purchased through a third party, please contact the retailer from whom you purchased.
We do regular stability testing, including accelerated heat testing to make sure our products will be over the guaranteed potency regardless of temperature. If you are still concerned about summer months, we encourage our customers to take advantage of our volume discounts and order larger amounts in the spring or winter.
Probiotics are alive and require refrigeration for optimum stability and shelf-life. Our probiotics remain stable due to our Totally Inert Packaging (TIP): the capsules are packaged in double-sealed, amber glass bottles containing rayon wadding and both moisture and oxygen absorption packets. They can be held at temperatures up to 75° F for up to one month but must be kept refrigerated beyond that to assure potency through the expiration date.
We do not. To study the effects heat has on our products, we placed a bottle of Theralac in a temperature controlled environment at 100 degrees Fahrenheit for 96 hours. It did not lose potency. In fact, Theralac lost only 13% of it's total potency after spending 14 consecutive days at 100 degrees. 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... Read more
Created by Scott Thurston
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... Read more