niacin may be liver toxic, niacinamide less so, especially in the doses in the energy drinks. He had gallstones, there is no link between the energy drink contents and gallstones. His explanation is also retarded, just throwing words like acid, esophagus and lungs into a pile of babble and hoping to make sense.
He sounds stupid and is stupid, the gallstones are more likely from welfare diet, and possible weight loss.