The short answer
GHK-Cu is a copper-binding tripeptide found naturally in human plasma and widely used in skincare; in cell and animal studies it boosts collagen and speeds wound repair. BPC-157 is derived from a protective protein in human gastric juice and, in animal studies, speeds the repair of tendons, ligaments, muscle and gut lining. GHK-Cu brings the skin and collagen side and BPC-157 the tendon and gut side, the logic behind the GLOW stack.
Side by side
| Compared | GHK-Cu | BPC-157 |
|---|---|---|
| Category | Healing & recovery | Healing & recovery |
| Also known as | Copper Peptide, GHK-Copper, Tripeptide-1 | Body Protection Compound 157, BPC157 |
| What it is | A small copper-binding peptide found naturally in your blood and widely used in skincare. | A peptide derived from a protective protein in your stomach. |
| How it works | Tripeptide (glycyl-histidyl-lysine) that binds a copper(II) ion. It occurs naturally in human plasma, and its sequence sits inside type I collagen and the tissue-remodeling protein SPARC. In cell and animal studies, GHK-Cu increased collagen, decorin and glycosaminoglycan production, raised VEGF output by fibroblasts, and damped inflammatory signals such as IL-6. Human evidence is limited to a handful of topical trials, most of them small. | Synthetic pentadecapeptide derived from a protein in human gastric juice. In animal studies it promotes angiogenesis, speeds tendon, ligament and muscle healing, modulates dopamine and serotonin systems, and protects the gut lining. |
| Commonly reported | Smoother texture and a more even tone after a month or two. Injected GHK-Cu hasn't been tested in a controlled trial. | Faster recovery from tendon and ligament injuries, and a calmer gut. It's one of the most widely used peptides in the community; the human studies so far are three small uncontrolled pilots. |
| Studied range | Research range: 1–2 mg. Studied in research — not a recommendation. | Research range: 200–500 mcg. Studied in research — not a recommendation. |
| How often | Daily | Once or twice daily |
| Half-life | Not measured in humans (breaks down quickly in plasma in rat and lab studies) | ~4–6 hours (community estimate for SubQ; not measured in people: in rats and dogs it cleared in under 30 minutes) |
| Route | SubQ injection, Topical application, IM injection | SubQ injection, IM injection, Oral (less studied) |
| Typical run | Often run 8–12 weeks. Can be cycled or run continuously at lower doses. Community consensus is loose. | Typically 4–12 weeks. Many run until injury resolves then stop. Some run indefinitely at lower doses. Opinions vary widely. |
| Evidence | Emerging: primarily preclinical / limited human data | Emerging: primarily preclinical / limited human data |
| Common side effects | Injection site reaction, skin irritation (topical), mild flushing | Nausea (rare), injection site irritation, vivid dreams, dizziness |
- Category
- GHK-CuHealing & recovery
- BPC-157Healing & recovery
- Also known as
- GHK-CuCopper Peptide, GHK-Copper, Tripeptide-1
- BPC-157Body Protection Compound 157, BPC157
- What it is
- GHK-CuA small copper-binding peptide found naturally in your blood and widely used in skincare.
- BPC-157A peptide derived from a protective protein in your stomach.
- How it works
- GHK-CuTripeptide (glycyl-histidyl-lysine) that binds a copper(II) ion. It occurs naturally in human plasma, and its sequence sits inside type I collagen and the tissue-remodeling protein SPARC. In cell and animal studies, GHK-Cu increased collagen, decorin and glycosaminoglycan production, raised VEGF output by fibroblasts, and damped inflammatory signals such as IL-6. Human evidence is limited to a handful of topical trials, most of them small.
- BPC-157Synthetic pentadecapeptide derived from a protein in human gastric juice. In animal studies it promotes angiogenesis, speeds tendon, ligament and muscle healing, modulates dopamine and serotonin systems, and protects the gut lining.
- Commonly reported
- GHK-CuSmoother texture and a more even tone after a month or two. Injected GHK-Cu hasn't been tested in a controlled trial.
- BPC-157Faster recovery from tendon and ligament injuries, and a calmer gut. It's one of the most widely used peptides in the community; the human studies so far are three small uncontrolled pilots.
- Studied range
- GHK-CuResearch range: 1–2 mg. Studied in research — not a recommendation.
- BPC-157Research range: 200–500 mcg. Studied in research — not a recommendation.
- How often
- GHK-CuDaily
- BPC-157Once or twice daily
- Half-life
- GHK-CuNot measured in humans (breaks down quickly in plasma in rat and lab studies)
- BPC-157~4–6 hours (community estimate for SubQ; not measured in people: in rats and dogs it cleared in under 30 minutes)
- Route
- GHK-CuSubQ injection, Topical application, IM injection
- BPC-157SubQ injection, IM injection, Oral (less studied)
- Typical run
- GHK-CuOften run 8–12 weeks. Can be cycled or run continuously at lower doses. Community consensus is loose.
- BPC-157Typically 4–12 weeks. Many run until injury resolves then stop. Some run indefinitely at lower doses. Opinions vary widely.
- Evidence
- GHK-CuEmerging: primarily preclinical / limited human data
- BPC-157Emerging: primarily preclinical / limited human data
- Common side effects
- GHK-CuInjection site reaction, skin irritation (topical), mild flushing
- BPC-157Nausea (rare), injection site irritation, vivid dreams, dizziness
Typical run: Community practice — opinions vary. Not a clinical recommendation.
Week by week
Each entry’s cards by day window, as the compound pages show them. Day 1 is the day you start it.
GHK-Cu
- Day 1–14 The first two weeks are groundwork
- Day 14–28 Texture tends to move first
- Day 28–56 This is where results tend to show
- Day 56–84 Weeks 8–12: time for an honest look
- Day 84+ Past the studied window — your read now
BPC-157
- Day 1–7 Week one: early hints, for some
- Day 7–14 Pain often starts to ease
- Day 14–21 Pain often eases by week three
- Day 21–28 Many report a calmer gut
- Day 28–42 The slower part of repair
- Day 42–56 Six weeks in: taking stock
- Day 84+ Past week 12, the data runs thin
Together or one or the other
GHK-Cu and BPC-157 are a common stack: each lists the other among its common stacks, and they’re together in the GLOW and KLOW stacks.
- GLOW: Skin & soft-tissue repair stack (BPC-157, TB-500 and GHK-Cu).
- KLOW: GLOW plus KPV — four repair peptides in one vial (KPV, BPC-157, TB-500 and GHK-Cu).
Community · GHK-Cu
Why GHK-Cu pairs with healing peptides
GHK-Cu brings the skin and collagen side; BPC-157 and TB-500 bring tendon, gut and wound repair. Together they repair from the surface down, which is the logic behind GLOW. Commonly reported: firmer skin and smoother recovery after procedures and small injuries.
Questions people ask
How long do GHK-Cu and BPC-157 last?
The half-life of GHK-Cu is not measured in humans (breaks down quickly in plasma in rat and lab studies). The half-life of BPC-157 is ~4–6 hours (community estimate for SubQ; not measured in people: in rats and dogs it cleared in under 30 minutes).
How often are GHK-Cu and BPC-157 taken?
GHK-Cu: daily. Routes: SubQ injection, topical application, IM injection. BPC-157: once or twice daily. Routes: SubQ injection, IM injection, oral (less studied).
How are GHK-Cu and BPC-157 dosed in research?
The research range for GHK-Cu is 1–2 mg. The research range for BPC-157 is 200–500 mcg. Studied in research — not a recommendation.
What are the common side effects of GHK-Cu and BPC-157?
For GHK-Cu, the library lists: injection site reaction, skin irritation (topical), mild flushing. For BPC-157: nausea (rare), injection site irritation, vivid dreams, dizziness.
Are GHK-Cu and BPC-157 taken together?
GHK-Cu and BPC-157 are a common stack: each lists the other among its common stacks, and they’re together in the GLOW and KLOW stacks. GHK-Cu brings the skin and collagen side; BPC-157 and TB-500 bring tendon, gut and wound repair. Together they repair from the surface down, which is the logic behind GLOW. Commonly reported: firmer skin and smoother recovery after procedures and small injuries.
Each one in full
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Track either one in PepVault
Log every dose of GHK-Cu or BPC-157, with reminders on your schedule. 7 days free on the yearly plan for new subscribers.
