I bought some and it had a strong chemical odor. I never used it. It will kill weeds though, so it will probably go in my sprayer this spring. Nobody else seems to have noticed this so maybe I got a bad batch. I get mine from the pharmacy, but I believe it is actually a cosmetic grade. I priced pharma grade from a compounding pharmacy once and they wanted $50 for a 1/2 liter. No thank you. I usually pay $10-12. I have some i bought on Amazon, but haven't opened it yet.
You really have to decide for yourself.