Stop being afraid of borax. It is wonderful stuff. As has been said before, it is about as toxic as salt. Regarding purity, borax is mined just like table salt. You can't refine either one any further. Hey, try to wash them and they dissolve, fer pitty sake.
One of the neatest benefits of boron is it basically doubles your absorption rate of calcium. It is required for strong bones.
The easy way to take borax is to get some gelatin capsules from yout pharmacy or health food store and make your own borax pills. Remember to take them with a cup of water.
If you found scented borax you goofed and bought boric acid instead. Some boric acid brands are perfumed. Boric acid is not dangerous, other than the fact it is acidic. Diluted it has been used for sprains, pains, bug bites and rashes for ages.
Boric acid is the one you want to use for insect control. Ants, termites, cockroaches and the like have a waxy coating on their bodies. Even a speck of boric acid will kill them by burning a hole in the coating so they dehydrate. I suspect a dusting would do the same for bedbugs.
Any form of borax is deadly to fungus. I sprayed the inside hull of my antique wooden boat to stop dry rot. Drill a hole near the base of a fence post, pour in some borax, and plug it. The borax diffuses through the wood to stop rot.