i did a test only cycle for my first time, got okay gains mostly got really lean and tone a little more vascular and pumps it was OK, i got sides like constipation headaces etc nothing bad, after i hit a deca only cycle and really like it had NO SIDES what so ever, but many people react different, i ran th deca for a about 10 or 11 weeks at 300mg a week it was great no sides, i got really hungry on deca so it helped me put on some mass i kept almost everything from it, the only side i got from it was SLIGHT deca dick never had a problem having sex i still got it up, if i felt it wouldnt go up i would take some pro horomone from gaspari nutrion and it was NO problem would i run it again alone probably not just because i know it would be probably way better with test. and if ur gear is vet gear its probably underdosed a bit i think u would be fine giving it a try alone at one cc a week just to see how you react to it alone, this is why i tried test alone, then deca alone.