I love Oxylift. I have previously tried another oxygen product but it did not agree with me. I find my skin is much clearer when I use Oxylift and I don't suffer from debilitating PMT. I noticed the benefits of this product after about 1 week where my skin was concerned as I suffer from acne. This is much improved and after 1 month my PMT symptoms were much better. I would definitely recommend this product even if you have not got on with other brands of oxygen drops.