Not all sulfur is the same. OptiMSM or its current equivalent is what should be taken. Moly-B is a great supplement but NAC does what Moly should far better assuming your Moly isn't being destroyed by Mercury.
I am going to try and make this real simple:
Several people only needed Moly before chelation, some neeed it during early chelation as well but most found no further help from Moly once the Cutler Protocol got in full swing.
From my experience the need for Moly is a sign of Copper toxicity..