Pyruvate is a molecule produced during glucose breakdown that plays an important role in energy production. It can enter the mitochondria where it is further broken down and converted to acetyl-CoA to be used in the Krebs cycle. Supplementing with pyruvate may help with weight loss by increasing metabolism and fat burning, though more research is needed. Pyruvate supplements are generally well-tolerated but can cause side effects like diarrhea or nausea in some individuals.