The honest answer
Why the 'never came back' injury is different.
Short answer
That 'healed to about 80% and then stalled' injury is usually low-blood-supply tissue — tendon or ligament — which heals slowest because it gets the least blood. The peptides in BPC Matrix have been studied in exactly those repair processes, in preclinical research. Read the experiences from people with similar injuries, and decide with your physician.
Tissue that heals slowest is tissue that gets the least blood. No blood, no delivery of repair cells — so a tendon or ligament can heal partway and then plateau. That's not weakness; it's circulation.
The four peptides have been looked at in blood-vessel growth, cell migration, inflammation and muscle — the exact processes involved. It's studied, not proven. The honest next step is a clinician who can evaluate the specific injury.
Straight answers
Slow-healing tissue like tendon and ligament gets little blood supply, so repair stalls. That's the tissue these peptides have been studied in.
Possibly worth evaluating with a physician. Read real experiences here, but treat them as experience, not a guarantee.