I have been taking PQQ for several weeks now and have noticed a small increase in energy when taking it. Unfortunately not to the sort of level other reviewers have reported. I trust the Seeking Health supplements so will continue using in hopes of something more soon. I have found it helpful to take prior to brushing my teeth as following the instructions and dissolving under my tongue leaves a blue film on my teeth.
I am a bit annoyed by how few tablets there are by comparison to bottle size. I ordered 4 bottles and upon opening, I could fit the contents of all four bottles in one, with quite a lot of room to spare. What an unfortunate waste of plastic. Surely you could use a smaller bottle or sell in larger quantities to match bottle size. In addition, when you pay for international shipping, there is never a discount, no matter how much you spend and so paying to ship four bottles instead of one doesn't sit well with my pocketbook either.