BPC-157
Also known as: Body Protection Compound · Pentadecapeptide BPC-157
A 15-amino-acid stretch lifted from a protein in human gastric juice. Best-known use is soft-tissue repair, with a quieter second life as a gut-healing protocol.
Overview
BPC-157 sits in an awkward spot: the animal data is genuinely impressive — tendons, ligaments, gut lining, peripheral nerve, all healing faster than controls across dozens of rodent studies — and the human data is almost nonexistent. People use it anyway, mostly because it tends to work for the kinds of nagging injuries (chronic Achilles, golfer's elbow, tweaky knees) that don't respond to rest or PT. The mechanism story is plausible: it appears to upregulate growth-factor receptors locally and accelerate angiogenesis at the injection site. Whether that translates as cleanly to humans as it does to rats is still the open question the literature hasn't answered.
Evidence quality
Dozens of rodent and rat studies, mostly from a single Croatian research group (Sikiric and colleagues) that has been investigating this peptide since the 1990s. The replication base outside that group is thin. No completed human RCTs are in the public literature. Use anecdotal-plus-animal as your evidence floor, not as a substitute for the clinical trials that have not been done.
Benefits & timeline
Benefits
- Faster recovery from chronic tendon and ligament injuries (animal evidence strong, human evidence anecdotal)
- Quiets gut inflammation; popular adjunct for IBD, NSAID-related gastritis, and post-antibiotic recovery
- Reduces joint discomfort during heavy training blocks
- Localised effect when injected near the injury — site-of-administration matters more than total dose
Timeline
Week 1
Subtle drop in baseline pain — easy to miss if you are not tracking it.
Week 2
Range of motion improves before pain fully resolves.
Week 3–4
Most users report the injury feels noticeably more durable.
Week 6
Plateau. If nothing has shifted by here, more weeks rarely help.
Off-cycle
4 weeks off lets you assess whether gains hold without ongoing dosing.
Dosage protocols
Advanced
750 mcg
split AM/PM
Beginner
250 mcg
once daily
Standard
500 mcg
split AM/PM
Titration & adjustment
Start at 250 mcg once daily near the injury site. After 1 week, escalate to 500 mcg daily (split AM/PM) if no improvement. Maximum 750 mcg daily. For gut healing, oral capsules at the same total daily dose work well. Cycle off for 4 weeks every 4–6 weeks.
Injection timing
Twice daily (morning + evening) splits keep tissue levels steady. Injection site should be as close to the injury as anatomically reasonable — for joints, inject subcutaneously adjacent; for deep tendon/ligament, intramuscular near the site. For gut healing, oral capsules with meals.
Side effects & contraindications
- mildInjection-site soreness or a small bump for 24h.
- mildMild headache in the first few days — usually fades.
- mildTransient nausea with oral capsules, especially fasted.
- moderateNo long-term human safety data. The compound has been in research and grey-market use since the 1990s without major signal, but "no signal yet" is not the same as "safe long-term".
Contraindications
- Active cancer or recent cancer history — angiogenesis is the exact mechanism you do not want to amplify
- Pregnancy or breastfeeding
- No pediatric data
- Caution with concurrent corticosteroid use; the two work in opposite directions on the repair pathway
Reconstitution & injection
A 5 mg vial mixed with 2 ml bacteriostatic water gives 2.5 mg per ml. That means a 250 mcg dose is 0.1 ml, which is 10 units on a U-100 insulin syringe. For injuries you can reach, inject as close to the site as the anatomy allows; subcut for joints and superficial tendons, intramuscular near the belly of the muscle for deep tendon or ligament work. For gut issues, oral capsules dosed with food work — peptide breakdown in the stomach is less of a problem than was initially assumed.
Open calculator pre-filledStorage after reconstitution
Refrigerate at 2–8 °C after reconstitution. Do not freeze. Light-protected. BPC-157 in BAC water has a shorter realistic window than most peptides — 14–21 days at fridge temperature. Some sources claim 28 days; bench studies show measurable degradation by day 21. The conservative play is to reconstitute small volumes (e.g. 5 mg in 2 ml = 2.5 mg/ml) and finish a vial in 2–3 weeks. Cold storage in sterile saline (instead of BAC water) extends stability marginally but BAC is the standard.
Common mistakes
Injecting far from the injury and hoping for systemic effect.
Better approach: The site-specific data is the strongest part of the animal literature. Inject within a few centimetres of the injured tissue. If you cannot reach the area cleanly, consider whether oral dosing fits the use case better (gut) or whether TB-500 is the more honest pick (systemic).
Stacking it with steroids during the same recovery window.
Better approach: Corticosteroids suppress the same growth-factor signalling BPC-157 appears to amplify. If you have a flare that requires a steroid course, pause the peptide until that is finished, then resume.
Running it indefinitely.
Better approach: The repair effect plateaus by about week 6. Beyond that you are paying for vials with diminishing return. Cycle 4–6 weeks on, 4 weeks off, and use the off period to gauge whether the gains hold.
Treating a 250 mcg dose as a fixed law because someone on a forum said so.
Better approach: The dose response is shallow in animal work — 250 mcg twice daily is the common protocol, but going to 500 mcg twice daily rarely produces a bigger effect. The variable that actually matters is consistency and proximity to the injury, not chasing higher numbers.
Real-world tips
- If injecting near a tendon, pinch the skin and go slowly — small needles still feel sharper over bony landmarks.
- Refrigerate after reconstitution. Most users see no potency loss for 4 weeks at fridge temperature in bacteriostatic water.
- Track one objective measure (range of motion, single-leg hop, grip strength) weekly. Pain scores drift; an objective measure tells you whether you are actually getting better or just feeling better.
- Oral and injected protocols can be combined for gut + tendon injury overlap. The two routes do not compete.
- Plan the off-cycle. Most people who feel like the peptide "stopped working" have been on it for 8+ weeks straight; the body is telling you to stop, not to escalate.
When something else is the better tool
TB-500
Use instead when: The injury is systemic or hard to localise (general training overuse, multiple small injuries, post-surgical full-body recovery). TB-500 is the more honest pick when there is no specific site to target.
GHK-Cu
Use instead when: The primary goal is connective-tissue quality and skin/hair rather than acute injury repair. GHK-Cu is slower and more cosmetic; BPC-157 is faster and more functional.
Targeted physical therapy + load management
Use instead when: You have not yet done the boring work. A peptide is not going to compensate for a missing eccentric loading programme on a tendon. Run the rehab protocol first; add BPC if you plateau.
- Subcutaneous or intramuscular?
- Subcutaneous near the injury for surface tendons, ligaments, and joints. Intramuscular when the target tissue sits deeper — calf, hamstring, deep glute. Both work; proximity matters more than route.
- Does the oral version actually work?
- It does for gut-targeted protocols (gastritis, IBD adjunct, leaky-gut symptoms) where the gut lining is the intended target tissue. For tendon and ligament work, injected is still the better tool — oral has not been compared head-to-head for systemic repair.
- How long until I feel something?
- Most users describe a subtle shift in pain or stiffness in the first two weeks, with the more durable feeling — the injury 'forgets it was injured' — landing around week 3–4. If you are at week 6 with no change, you are unlikely to find one at week 12.
- Is there a risk to long-term use?
- There is no human safety data that says yes, and none that says no. The grey-market track record is long without obvious signals, but that is reassurance, not proof. The cancer caution is the one to take seriously — angiogenesis is exactly the mechanism you do not want to amplify in someone with an active or recent tumour.
- Can I store reconstituted vials at room temperature?
- Fridge is the safer choice. Room-temperature stability in bacteriostatic water is reasonable for a few days but degrades from there. If you are travelling, an insulated pouch with an ice pack is enough for a long-haul flight.