Simply put, there is no way this peptide is actually repairing damaged cartilage/tendon in a matter of hours - much less repairing torn muscles.
Cartilage has a very limited capacity for regeneration and even if this compound were to speed up the process 10-fold you would still be talking about weeks or months to experience restored pain-free range of motion through actual healing.
I'm not saying this peptide doesn't work in some fashion, but it is literally impossible to achieve rapid repair in avascular tissue. It is likely having an anti-inflammatory effect and I would caution anyone to tread lightly with stressing areas where you have just experienced debilitating pain.