Quote: 1) I was taking 1 teaspoon of Benefiber twice daily.
The instructions on the label of the original Benefiber say 12 yrs. to adult 2 teaspoons 3 times daily . I presume you are not taking the orange flavoured version because it contains aspartame and lactose (milk).
Constipation is not a known side effect of Align. If you have tried Align and VSL#3 then probiotics may not be the answer for you. They don't work for everyone.
What fruits and veggies are you eating to get your soluble and insoluble fiber from other than from Benefiber?
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS