How dangerous is 2CB and how often I can take it? Have you got some reliable information about dosage, duration, etc?
2C-B is a substance known during the last 40 years and there is no evidence of neurotoxic or long-lasting toxic effects. It should be used with caution, as any other psychedelic. Dosages between 5-10 mg produce stimulant empathogenic effects, these effects are more psychedelic in the rank of 20-30 mg. In my opinion it should not be used more than once a month.
Erowid is one of the best sources of information about drugs:
Our team published a study about 2C-B effects in humans that might interest you