Just finished my 1st bottle and buying my 2nd. About a week in I noticed the effects and was quote pleased. No real length gain, definitely a little harder, but mostly considerable girth increase. I felt thicker and heavier which led to some great time with my gf, and she definitely noticed I was much thicker than normal. No undesirable side effects, it did increase my libido and stamina. My gf nicknamed me big boy now and she means it, that feels awesome lol.