Genuine butea superba is very safe. Butea superba actually is on the border between what wood be considered food and what would be considered a medical herb. Butea superba tubers are the part of the plant that is used as for human health. For the plant in the wild, these tubers are storage containers of nutrients, just as the tubers of potatoes or cassava plants. Animals in the wild, like boars or rabbits, consume butea superba tubers as food. But even though genuine butea superba is not a danger in itself, safety concerns are justified when it comes to commercial products. Genuine butea superba is fairly rare, and found only in a narrow geographical location (mostly Thailand), many cheap commercial products claiming to be butea superba are actually something else, for example sawdust spiked with the active ingredients of prescription drugs. And these active ingredients are classified as prescription-only precisely out of justified worries about their safety. But definitely, genuine butea superba is safe.