i have been desperately trying to find a clean "organic" source but there was only one site that both myself and UNY came across...they were out of stock and it was from the UK...i don't know what it would cost or if they even ship here....
UNY checked and they are out of stock. looks like a "clean" source though.
i do my best with organic foods...if i can't get organic, i don't beat myself up over it. all we can do is try our best and weigh out the benefits vs. risks. if tamarind will truly flush out the fluoride, it is probably worth it, regardless of the source.