I have been trying this for about 6 days, and so far so good. Things seem to be quieter than usual.
There are no added vitamins that I can tell (except for the vitamin C). The label lists vitamins that are naturally present in yeast, so unless you are allergic to yeast, you should have no problem. If the vitamins are added, they are in such small amounts, they should not be an issue.
I am particularly sensitive to most supplements, and remedies, so I am actually quite surprised that I have had no side effects from this, and I am taking the full recomended dose.
How long before full effects are usually noticed??