Some smart marketers claim that taking probiotic supplements can prevent or treat diseases like schizophrenia, autism and many others. Scientific evidence strongly suggests that most chronic ailments, including mental diseases, are influenced or caused by lifestyle choices and diet in particular. However, it would be a mistake to think that taking a probiotic supplement can outweigh an otherwise crappy diet. That’s not how it works.However, supplements are proven to help with conditions such as antibiotic-induced diarrhea and travelers’ diarrhea, and in some cases have been shown to help with ulcerative colitis, food allergies and vitamin deficiencies.If you choose to use a supplement, I recommend a high-quality brand, such as Terraflora or Performance Lab.