Yes, you can make excellent gains on 400 mg primobolin a week but you will need to train very hard and eat properly. It will not blow you up fast like test. However, it will induce a state of high positive nitrogen balance which means your muscles will recuperate and rebuild must faster than being natural. You will definitely be in a state of anabolism..but again, it will do nothing if your workouts aren't great. On test, you can get away with mediocre training and will still inflate quickly. If you could find some Proviron, I would add it to the primo. The DHT in it will keep your libdo strong and you'll get a fuller harder look than on Primo alone. Neither of these compounds suppress natural test to the same extent as Tren or test..so with some good PCT after 12 weeks or so, you could possibly retain some of your gains and not be shut down for a long time. A smart way to go as oppossed to the Test/deca/tren cycles which blow you up, but have you lose most everything after the cycle is over.