T Nation

Type of Test in AndroGel/Androderm?


#1

I'm curious what type of Testosterone is in Androgel because it just says "Testosterone USP" and as I understand it, there are many types of Testosterone?

And the AndroDerm patch which I've been changed to, I'm curious what type of Testosterone it is.

Thank you so much!


#2

It is TNE, Testosterone, no ester. Basically, for Test to be absorbed through the skin, or any molecule for that matter, it needs to have a molecular weight under 300 (along with a substance to carry it across the skin and into the blood stream). I believe TNE is 296 or so.
Since it has no ester it needs to be applied everyday to keep the blood concentration of it higher. Testosterone with its esters: Propionate, Cypionate and Enanthate make the molocule too large (heavy) to pass through your skin.


#3

I've been looking for that information, PKNY. I have some straight T that is not suitable for injection, but might be used either transdermally or sublungually. How do I learn more on effective doses and any agents that might help absorption?


#4

I have been researching the whole subject since starting HRT last summer.
There are a bunch of formulas on message boards.