J, I used it for my Superdrol/Epistane cycle 7 weeker. Nuts did not atrophy once on cycle. Bigger than ever actually. Headed into PCT without it and my nuts atrophied maybe 20% for about 2-3 days than back to normal.
It won't prevent shutdown of the pituitary, but it will prevent shut down in the balls and keep them functioning all throughout cycle. So once you stop using it, and you are still shut down in the pituitary, so you might atrophy a bit. But it sped up recovery for me.
If you go for a 5 month long cycle, you will be shut down at the pituitary for 5 months... so it's still risky. But the pituitary does recover faster than the testes.
250iu 2x a week for weeks 1-4
300iu 2x a week for weeks 4-8
400iu 2x a week for weeks 8-12
If you go beyond this many weeks in the cycle I would not go over 500iu 2x a week. Subq injections with slin pin in the abdomen.