Why does India have so many sick people, very sick, damaged, disfigured people, when they say turmeric and pepper cures the world of all that ails it? Why does the world buy into it? Because they say it with confidence and back it up with science.
How can one prove something like that? One can’t. But it sells a lot of turmeric and black pepper and a whole bunch of other India grown and used supplements. Hey even I take it, till my teeth started turning yellow and it took a chemical whitener to remove it.