I have tried two different high potency probiotics in recent weeks and have gotten post-nasal drip from both of them. the first one was Strengtia by Apex Energetics and the second was Xymogen ProBioMax Daily DF. They both have 30 billion units but have completely different organisms. Before starting these products, I had been taking a lower-potency probiotic that has 2.5 billion units. I have taken higher potency probiotics in previous years and have not noticed them causing post-nasal drip. I do have pollen and mold allergies, but am taking allergy shots for them and wasn't having post-nasal drip. Does anyone have any idea why the higher potency probiotics would be causing post-nasal drip?