AG1 is a once-daily powdered supplement that combines a multivitamin, minerals, prebiotics and probiotics, antioxidants, and whole-food ingredients into a single scoop mixed with water. It is third-party tested and NSF Certified for Sport®, meaning an independent lab verifies that what is on the label is what is in the container. That verification is not standard in the supplement industry, and it is one of the main reasons we chose it.