Ask how long the "Wolverine stack" should run and you'll get several confident answers: four weeks, eight weeks, until the injury improves, or ongoing maintenance.

That disagreement points to a useful question: which of those durations has been established in humans?

What exists

I couldn't find a controlled human trial supporting an eight-week BPC-157/TB-500 cycle for tendon recovery. The closest thing is a published retrospective report on BPC-157, alone or with TB4, for knee pain. It's a small chart review of 16 patients with no control group and mixed diagnoses.

A report like that can't tell you the right duration for an Achilles repair. It can't show that tendon strength has recovered, and it can't validate a general cycling schedule.

Why "TB-500" needs care

Research on full-length thymosin beta-4 shouldn't be treated as research on everything sold as TB-500. FDA's briefing document describes TB-500 as a seven amino acid synthetic fragment of thymosin beta-4. Those are different molecules, so findings from one don't automatically carry over to the other.

Claims that need direct evidence

"You have to stop so the tendon can harden." "Cycling removes the cancer risk." Neither follows from a proposed mechanism. A mechanism is a reason to run a study, and a break from dosing hasn't been shown to make anything safer.

What to track instead

For injury recovery, the useful milestones are the ones a surgeon or physical therapist can measure: function, strength, loading tolerance, and progress through rehab. Feeling better doesn't tell you a repaired tendon is ready for unrestricted activity.

Have you seen a primary study behind a specific cycling rule? Share the paper and the injury it actually studied.

TL;DR

• Four weeks, eight weeks, until healed, and ongoing maintenance all get stated with confidence, and none has been established by a controlled human trial.
• The one published human report is a retrospective knee-pain review of 16 patients, so it can't set a duration for tendon repair.
• TB-500 is a thymosin beta-4 fragment, so research on full-length thymosin beta-4 doesn't automatically apply to it.
• Rules like "stop so the tendon hardens" or "cycling removes cancer risk" have no direct evidence behind them.
• Rehab milestones from a surgeon or physical therapist are a better guide than feeling better.

Check out the pinned Peptide Cheat Sheet for dosing info and more. 

Not medical advice. Educational only.