Hmmm.... why would you want to slow it down? IF you aren\'t gaining weight, just eat more. A fast metabolism is always a good thing, because the faster it is, the more food you can process so the more macronutrients you can take in. You can slow down absorption rates, but I don\'t know of a sup that\'ll slow down you metabolism, even if there were legal ones out there, they\'d be like taking a barbituate.
as far man titties, well the culprit can be two things;
1. Excess fat, and the only way to decrease fat is to use more calories than you take in. Whether if it\'s diet, exercise or a combination.
2. Gynecomastia aka Gyno. This is where men grow breat tissue due to increased etrogen levels, due to high soy diet, steroid use etc... Steroid use causes it because test and estrogen levels are on a feedback loop, and when you\'re on gear your body halts it\'s natural production of estro and test, because there\'s way too much in your body as it is while on steroids. When you cycle of steroids your body overcompensates with making a shit load of estrogen, thus growing man boobies. When I was on 1-AD, I cycled off and took an aromazation inhibitor that stops test from becoming estrogen so I didn\'t grow boobs. Anti-E\'s or amaramization inhibitors work to a small degree in reversing gyno, but alot of men have to have breast reduction surgery.