1-TDC® stands for 1-TetraDecanol Complex, its molecular name. 1-TDC® Dual Action is a new generation of fatty acid oils with a different molecular structure and properties that are far superior to traditional essential oils. It is a unique Dual Action product recommended for natural GUM & JOINT HEALTH for dogs and cats. These easy-to-use convenient 1-TDC® Dual Action soft gels provide superb results. 1-TDC® Dual Action is the only product that provides the option to support both Periodontal and Joint Health in one solution. Because 1-TDC® periodontal is very palatable, the experience for your cat or dog is a positive one. This is important as it significantly improves compliance in keeping your pet's gums healthy. 1-TDC® is a new generation of fatty acid -- with extensive scientific research. It delivers remarkable joint health support. You will observe the difference in days. And more importantly, your pets will FEEL the difference! 1-TDC® is very palatable! Many small dogs and cats take 1-TDC® just like a treat, because it is very palatable. Some love to chew the soft gels, or you can cut open the soft gel and squeeze out the contents for your pet. For an unusually finiky cat, squeeze out the contents and apply it to the nose to be licked off. The soft gel is perfectly safe for them to digest.