This is one dose that works. I could definitely feel a difference. Now, to be honest, in my younger and crazier years, I did injectible testosterone, so I know what the stuff feels like. The i-dose is way more subtle, so if you are looking for bulk, this dose will not work like ethanate or cip, but if you need a little more pep in your step, I think this may help. I am in my 60's, so I don't have a lot of natural test, but this dose made a difference.