The study also led to the death of 6 patients of the l-arginine which led the study being cancelled at an early stage. There are also minor side effects associated with l-arginine that can be experienced as a result of overdose. Some of these side effects are nausea, diarrhea, and weakness in the body. This is why it is important that you pay close attention to the type of diet you are following. We have already mentioned how l-arginine is found in many food sources.