I have a PhD in human nutrition/nutritional biochemistry and am a Registered Dietitian and American College of Sports Medicine certified Exercise Specialist. I've worked with athletes in the ACC, SEC, Olympic training center in San Diego and played football at Virginia Tech. I'm 6'3", 225# and would have little trouble lifting you, let alone 5lb dumbells. Keep believing the marketing hype and blowing what little money you have on supplements to pump those arms up from 12" to 13".
Tell me Joe Weider, how do prison inmates, on 3 squares/day+candy bars from the vending machine and Marlboro Lights get bigger and stronger than you ever will, all without the magical help of supplements?