Protein powder gives me bad diarrhea. What should I use?

Food. No need to take protein powder, unless there is some diagnosed intestinal ailment or need for supplementation that can not be met be eating real food. Protein sources include meat, fish, poultry, dairy (milk, yogurt, cheese, kefir), bean products including tofu, tempeh, eggs, nuts, seeds; grains generally leeser source of high quality protein. Quinoa exceptional (a seed that cooks like a grain).