Whenever possible, we source raw materials from the USA. However, some materials are only available in other parts of the world including China, India, Europe and Southeast Asia. All products manufactured by 21st Century are made from raw materials sourced exclusively from qualified & certified suppliers. These materials must meet their quality specifications that are established using reference from well-known quality standards like the Food Chemicals Codex (FCC) and the United States Pharmacopeia (USP) in order to qualify to be used in the manufacture of 21st Century products.

21st Century adheres to full cGMP (current good manufacturing practices). In addition to our own ISO-certified laboratory, we employ the services of six additional ISO-certified laboratories to ensure that all raw materials meet their specifications for identity, purity, and potency.

Our warehousing, manufacturing, packaging and shipping facilities are certified as Safe Quality Food (SQF) facilities by Underwriters Laboratories (UL) and the company prescribes to the international Global Food Safety Initiative (GFSI).

Upon the completion of the manufacturing process, 21st Century finished products are again tested for purity, strength, composition and to assure they are free of microbiological and other contaminants. You can be assured that the vitamins produced by 21st Century in Tempe, Arizona are of the highest and finest quality.

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Like human supplements, dietary supplements for companion pets are subject to regulation under the Federal Food, Drug, and Cosmetic Act (FFDCA). Individual States also follow standards set by the American Association of Feed Control Officials (AAFCO), Codex, and U.S. Pharmacopeia (USP) for state laws on the sales of dietary supplements for pets.

Vitamins and Supplements are intended to support a balanced diet. This is required language on feed supplements since they cannot meet either the adult maintenance, or growth, and/or reproduction standards of a full and balanced diet required like dog and cat foods. The statement advises that the product, alone does not constitute a healthy diet but supplements a healthy diet. Products bearing this warning can be administered every day or as needed.

Storage instructions are printed on all PetNC labels. These items are best when stored in a dry cool space. Avoid storage locations over 86°F. Do not refrigerate pills as the humidity and condensation created could affect the integrity of the pill, softgel or capsule. It is wise to keep pet supplements in a cabinet at least 5 feet off the ground. Animals consider flavored supplements to be treats and will work hard at retrieving a bottle from a counter or a table, and given time, will eat them all. Do not wrap pet supplements as gifts and leave them under a Christmas tree or in a location where your pet can smell them. Accidental overconsumption of dietary supplements rarely result in pet fatalities, but can cause great discomfort like nausea, vomiting or diarrhea.

Your young pet is considered a puppy or a kitten until it reaches 80 to 90 percent of its anticipated weight and has developed a healthy immune system. When your pet was born, it inherited its immune system from its mother. Your kitten and puppy will gain the majority of their weight and develop independent immune system by approximately 9mos of age. Many supplements should not be administered to puppies and kittens. The labels of these products will indicate if they are appropriate for kitten, puppies or animals under 9mos old. Products indicated for Adult Dogs or Adult Cats Only can be given to a healthy animal that is 9mos or older. If your pet is being treated by a veterinarian, consult his/her advice prior to administering a dietary supplement.

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