Rule 1 Proteins emerged in the supplement industry in 2014 and have not looked back since. Their founders have a lot of industry experience due to their original brand, Optimum Nutrition. Rule 1 Proteins entered with their cost effective protein, R1. With a large flavor variety and arguably some of the best tasting flavors in the industry, R1 continues to be one of the top selling protein powders today. Rule 1 Proteins didn't stop there though. They created some of the most cost effective and best tasting blended proteins and gainers in the market today. While Rule 1 is mostly proteins, they offer a variety of products in the wellness category too.