Let's be honest! - I bought this because I'd heard peppermint oil was an effective deterrent to rats and I had one (or more) in my garden shed that I wanted to deter. I'm not sure whether it worked, but at least the rats seem to have gone....and so has the rat poison.
Used this in my oil burner, lovely fresh peppermint smell filled the house. Felt like Christmas!! Also added drops to water and sprayed around the home to keep spiders at bay (seems to be working). Great product.
It smells of peppermint, but not the peppermint I expect from Mentha Piperita, it lacks sweetness and comes across as chemically (think toilet cleaner) and bitter.
I bought it to use as a aromatherapy oil, but because of its not entirely pleasant smell, I'm only using it on cotton wool balls to deter spiders in a particularly spider prone area. It seems to work for this purpose, but I wouldn't want to put it in a diffuser etc.
Perhaps it's just a bad batch but I won't be buying again.