The mean habitual protein intake observed in these studies was 2.05 g · kg 1 · d 1. Clearly, at these levels of protein intake, assuming that
reported protein intakes from diet records are accurate; these
athletes are meeting their protein requirements by any standard.
Hence, any discussion of “safe” or adequate protein intakes for
strength-training athletes appears to be dubious. Most, if not all,
strength-training athletes are getting the protein intake required for
gaining and/or maintaining any amount of skeletal muscle mass!
Protein supplements, although convenient, are quite obviously
(Figure 6) not necessary for most resistance-trained athletes.
...
There is no evidence to suggest that protein supplements are more
effective than consumption of high-quality protein from standard
dietary sources.