It isn't just whether the herb itself is harmless, but whether it is available from a high quality trusted source. Some people have become sick from herbs from an unreliable source that were contaminated with toxic herbs. As it becomes more popular, larger and better known herb companies will sell it.

Even some widely used herbs like thyme can be dangerous if used excessively. I realize you are very enthusiastic about tulsi. I am just a bit hesitant and want to learn more about it and see it widely used here for a while before I try it.

Have you seen any US physicians recommending tulsi?