Protein requirements vary based on the type and intensity of activity. Bodybuilders and endurance athletes are at the high end of the range. Keep in mind that the body can only use so much protein. Any excess has to be broken down and excreted and this puts quite a strain on the kidneys. Remember that increased protein consumption won't increase muscle size.
Growth is the result of serious training and a high quality diet.
It has very little to do with powders or pills. Some of the latest gadgets people have been asking about are the home scales and hand-held devices that measures body fat. These use bioelectrical impedance analysis technology. A National Institutes of Health report suggests that BIA technology may be fairly inaccurate because so much can go wrong. They also say that different manufacturers use different formulas to estimate body fat, so the calculations may vary by as much as 10 percent of bodyweight.