What about Holy Basil?

Or.....oil of holy basil? I had heard, some time ago, that Holy Basil was excellent in removing heavy metals and free radicals. In fact, I grew some and made tea from it and chewed the leaves, raw. A neighbor who was undergoing chemotherapy also chewed it and was thrilled at how much better she felt once she started using it on a regular basis.

Any validity to that? Thanks!