Power Gel is a transdermal that was put out by an old sponsor of this board. I have not heard any feedback from people using the product. However, I do know that a 4 oz. bottle of T-Gel will hold the same, or more, amount of powder then the 8 oz.(I think they are 8oz) bottle of Power Gel. I also believe the T-Gel has a much more superior solvent that will yield a higher percentage of compound into your system.