Not sure.
We synthesize all amino acids in our body, save seven amino acids called the essential amino acids we get from food. Not knowing what pills you are talking about I do not know if the pills contain the amino acids we call essential or are the synthesized amino acids that, perhaps, someone is not able to synthesize and needs these pills as a substitute.
We only use 20 amino acids and if the pills did not contain one of these 20 amino acids, or they contained something else, then we could not use them in our bodies.