There is contrversey around this issue- however AM is good-cant go wrong there. Some say to stay away from natural production times -others say- hit it at the time the body does- I dont like that because Iam afraid of shuting down my own production and as we get older it ( our production) drops dramatically- I wont take the chance my opinion is based on experience and protocol from Paul Borresen.
AM and mid PM is best times. Taking it at bed time is the worst. Unlike roids, extra GH is promptly eliminated from the body. More is not better, more is just a waste.