The 4-AD-EC didn’t hold a candle to MAG-10 for me. After a week I lose the horny, “testy” feeling and get puffy and smooth. It also increases my appetite, making weight loss more difficult. I stick with the MAG-10. I’m 46. My 22-year-old son swears by the 4-AD-EC. He feels that it helps him cut fat and improves his workouts.