Testosterone suspension is an injectable preparation containing unesterfied testosterone in a water base. Testosterone suspension is one of the oldest forms of testosterone.

It differs from the other testosterone in that is dissolved in water, giving it some unique properties. The most significant one is that it is absorbs very quickly and starts to have an effect in 1-2 hours after injecting.

Very fast acting, testosterone suspension will sustain elevated testosterone levels for 1- 2 days only. This drug requires frequent injections. The testosterone in this compound will convert easily easily into dihydrotestosterone and estogens.