Apparently, there exists a process called Amino Spiking in which cheaper, non-muscle-building, amino acids are added into protein powder to artificially inflate the protein percentage on the nutrition facts. Major amino spiking can result in protein powders which read as though you're consuming 25 g of protein per scoop but in reality, you're only consuming 10-15 g of useful protein content.
A red flag for amino spiking is a cheap protein powder. I purchase my protein online and it is quite a bit cheaper than supplement store protein powders.
Is there a way to check if my protein powder has been amino spiked? The protein powder bag has the nutrition information, per 30 g scoop, as well as the amino acid profile per 100 g.