Which peptide would be the best for my moms muscles and joints?

My mom has been having problems in her shoulder and leg, going to the doctor has been completely useless and waste of time. She has some kind of inflamation/kind of arthritis, not perfectly sure. I wan't to convince her to try peptides, because any kind of treatment at the doctor is just a useless headache.

At first I've heard about BPC-157 and TB-500. Would she need both, or just one? And are there any other options that could help?