I recently started taking Now Foods Probiotic. If you have the money VSL-3 is probably the best one. I felt a euphoric effect and a generalized sense of well being after taking it.

https://www.amazon.com/NOW-Probiotic-10-Billion-Veg-Capsules/dp/B002S1U7RU/ref=sr_1_2_s_it?s=hpc&ie=UTF8&qid=1504993292&sr=1-2&keywords=now+foods+probiotic

https://www.amazon.com/Potency-Probiotic-Capsules-Ulcerative-Colitis/dp/B0014R4RZW/ref=sr_1_2_a_it?ie=UTF8&qid=1504993280&sr=8-2&keywords=vsl+3