Van its seems like you have dont your home work , thats good.There are alot of natural ways to raise your natural testosterone levels.There alot of junk products out there like MethoxyIsolflavone, and Beta Ectosterone, which is pure junk.But there are things like Longfolia -Eurocomia Jack -Lonfellow Jack, Yohimbine, Velvet Deer Antler Bulgarian Tribulus ,Muira Puima , Maca just to name a few.Of course if you stacked them all together it would work best.I admit Tribulus by itself is okay, but if taken with Longfolia, or Andorstene it really kicks in.Its kind of Like 1+1= 3.They work decently alone but they are 3 times more effective when taking together, kind of like anabolics.Herbs are not as strong as anabolics, and never will be, but they can help out the natural athlete.Not everyone wants to take anabolics so natural testosterone boosters are there only choice.No there not going to make you ripped at 280 lbs, but they can add up to 10 % on your size and lifts, which isnt bad