The key issue with muscle gain is not so much protein intake (although that is important), but rather your overall calorie surplus or deficit. If you are running a calorie deficit, your body will tend to burn protein for energy, rather than using it to create new muscle tissue.
The science of protein intake and muscle gain is one of the most abused in exercise. What the research does support is an intake of 1-1.4 grams of protein per KILOGRAM of bodyweight, for athletes in heavy training. Many people interpret this as 1-1.4 grams per POUND (and 1 kg = 2.2 lbs) and end up with a protein intake way too high to be useful. 124 lbs = 56 kg, which implies a recommended intake in the range of 56-78. Your intake isn't really too low - but increasing it a little may be useful.
I agree with the general consensus that it is better to get protein from food rather than supplements. Supplements are occasionally useful in the cutting phase when you want to increase protein without increasing calories too much. But if you want to add muscle tissue, then calories is something you are probably looking at increasing anyway,
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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