Sam Has Started Following a Strength Training Program This Semester

Sam has started following a strength training program this semester and is trying to increase his muscle size and strength. He has had trouble eating a healthy, balanced diet in the past and is currently trying to eat a balanced diet with adequate calories and protein. However, he is unsure if he is getting enough protein because he follows a lacto-ovo vegetarian diet, in which he consumes dairy products and eggs, but no fish or meat.
Sam has been looking into ways to supplement his diet with amino acid supplements. However, Sam's sister Katie is concerned that the supplements could adversely affect his health. Answer the following questions to help Sam make the best decisions for increasing protein intake without experiencing negative side effects.
Sam is excited to try some different amino acid supplements he believes might enhance his muscle strength. What should his sister Katie tell him?

A) It might be a good idea to supplement his diet because he is a vegetarian.
B) Only purchase amino acids supplements that are highly recommended by the sales staff at the supplement store.
C) The purity, dosage, and safety of the amino acid supplements available on the Web and in stores are not guaranteed.
D) Amino acid supplements are not safe, and he should try protein powders.
E) The supplements will most likely work better for muscle strength building than high-quality protein from foods.