Should you buy modular protein supplements?

Modular protein supplements are liquid meals or powders that are mixed with water or milk and provide additional protein or specific amino acids. These supplements are mainly used by older adults who need more protein for wound healing or to prevent physical degeneration. Some bodybuilders use these supplements to increase their protein intake while minimizing calorie intake.
These supplements contain all the essential amino acids (formerly known as essential amino acids) and plenty of other amino acids to meet non-specific nitrogen requirements. Products made from collagen protein or a combination of collagen protein and complete protein provide less bioavailable protein. Whey protein supplements are quickly absorbed by the body and provide a high quality source of concentrated protein for athletes. Specific amino acid supplements that contain HMB, glutamine or branched-chain amino acids could be beneficial for athletes.
(Nutrition Clinical Practice, 21:485-504, 2006)