Yes, Ramesh, you are right. There is something called "evidence" in medicine. Unless you provide the evidence, it is really difficult to say what their action is on our body. The best approach is to consult a doctor.
I do appreciate the effort and interest of Iqbal in sharing information with us, but medical advice must be authenticated before being published. Sorry, Iqbal, not to offend you in any way...
Regards,
Sowmini.