"not recommended in what context? Because, generally, I certainly don't have a problem with it~"
A couple of folks over there developed nausea after taking Mule Team internally, thats why I dont recommend it anymore.
I have no chance to test it as it is not sold over here.
I heard it may contain additives as detergents, but it may not be so. Maybe it was a coincidence; some batches may not be pure, as it is a mined product.
I recommend the 100 % cosmetical or pharma grade just to be on the safer side. That said, I never had problem with any of the types I have tested; one from the pharmacy, one from the chemist, one ala Mule Team (from UK) Lately I have only purchased from Mountain Rose.