T Nation

Applying Half Life to Test Therapy


If test cyp has a half life of eight days...and it takes about 10 days for it to "hit"...does that mean that a person really only gets less than half of the effect if they were to only inject it once?

My RX says to inject once a month...thanks to the good advise here, I have decided to split it up.


with cyp injecting E3D to E5D will give you the best results with regards to stable blood levels, this also means less per shot so it is usually more tolerable.

as for the question, the short answer is yes, but barely. it is mostly the ups and downs in blood test concentration we are trying to avoid.


For an accurate understanding of half lives, I suggest you use this link:


I use to figure optimum times for b/w