Bitrex is the brand name of the most bitter substance yet discovered. It's now over 50 years since serendipity presented Macf ... arlan Smith with Bitrex, and we want the world to know! Throughout 2018, we will be participating in numerous events to promote the use of Bitrex, and the added peace of mind it provides to parents, manufacturers and retailers globally. Bitrex can help make our world a better, albeit bitter, place. read more