If you see that a protein powder contains any added amino acids, be skeptical.
Additional amino acids is often a sign of amino spiking, which is a deceitful practice wherein large amounts amino acids like L-glycine are included and counted them toward the total protein per serving. This is misleading because protein is a complex chain of up to 21 different amino acids. There are no proteins that contain only one amino acid.
Amino spiking is a common way that protein manufacturers and sellers rip consumers off. This way companies sell low-quality protein that contains for example just 15 grams of protein per serving, add several grams of an inexpensive amino acid like glycine or alanine and legally say it contains more protein per serving than it really does.
There’s little to no reason to add amino acids to protein powder, including BCAAs, and so this often just means the product is amino spiked.
A good way to protect yourself as a consumer, however, is to check ingredient lists, serving sizes, and amounts of protein per serving before buying.