Intro
Peptide therapy often looks like alphabet soup.
BPC-157. CJC-1295. MOTS-c. TB-500.
But each peptide does something very different in the body.
This guide breaks them down in plain English — what they do, how they work, and what category they actually belong to.
Key Points
- Peptides are short chains of amino acids that act as signals in the body
- Some are approved medicines (like GLP-1 drugs)
- Many are experimental or clinic-driven therapies
- Similar names ≠ similar effects
At a Glance: Common Peptides Explained
| Peptide | Full Name | What it does | Use | Evidence |
|---|---|---|---|---|
| GLP-1 | Glucagon-Like Peptide-1 | Appetite + glucose control | Weight loss | Strong |
| BPC-157 | Body Protection Compound-157 | Tissue healing | Injury | Limited |
| TB-500 | Thymosin Beta-4 (fragment) | Cell repair | Recovery | Limited |
| CJC-1295 | Growth Hormone Releasing Hormone analogue | GH release | Body comp | Limited |
| Ipamorelin | Ghrelin receptor agonist peptide | GH pulses | Recovery | Limited |
| MOTS-c | Mitochondrial Open Reading Frame of the 12S rRNA-c | Energy metabolism | Longevity | Early |
| Epitalon | Ala-Glu-Asp-Gly peptide (synthetic tetrapeptide) | Aging research | Longevity | Very limited |
| Semax | ACTH(4–10) analogue | Brain signaling | Focus | Limited |
| Selank | Tuftsin analogue peptide | Anxiety modulation | Mood | Limited |
| Kisspeptin-10 | Kisspeptin fragment (KISS1 gene product) | Reproductive hormones | Fertility | Limited |
| Melanotan II | Synthetic melanocortin analogue | Pigmentation | Tanning | Risk |
The Main Categories (Simple Mental Model)
1. Metabolic & Weight Loss
These are the most medically established.
- GLP-1 drugs regulate appetite and insulin
- Used in obesity and diabetes
👉 Read more: GLP-1 Weight Loss Drugs: How They Work, Benefits, and Risks
2. Healing & Recovery
Focused on tissue repair and regeneration.
- BPC-157 → injury and gut healing claims
- TB-500 → muscle recovery
👉 Read more: BPC-157: Benefits, Risks, and What the Evidence Shows
👉 Read more: Thymosin Beta-4: What It Is and What the Evidence Shows
3. Growth Hormone Peptides
Stimulate the body’s own growth hormone system.
- CJC-1295
- Ipamorelin
👉 Often marketed for anti-aging and physique
4. Longevity & Cellular Energy
Experimental peptides targeting aging mechanisms.
- MOTS-c → metabolism
- Epitalon → telomere research
👉 Mostly early-stage science
5. Brain & Cognitive Peptides
Act on neurotransmitters and brain signaling.
- Semax → focus
- Selank → anxiety
👉 Common in nootropic communities
6. Hormone Signaling
- Kisspeptin → reproductive hormones
👉 Primarily research-based
7. Cosmetic / High-Risk
- Melanotan II → tanning
👉 Significant safety concerns and regulatory issues
The Critical Distinction (Most Important Section)
There are two completely different categories:
✅ Approved peptide medicines
- GLP-1 drugs
- Insulin
- Hormone therapies
⚠️ Experimental / clinic / grey-market peptides
- BPC-157
- TB-500
- MOTS-c
- Semax / Selank
These are not equivalent — in evidence, safety, or regulation.
Why Peptides Feel Confusing
- Scientific naming (not consumer-friendly)
- Mixed marketing (medical + wellness + performance)
- Huge variation in evidence
- Rapid growth of telehealth and online sales
FAQ
Q: What does BPC-157 actually do?
A: It’s proposed to support tissue healing and gut repair, but strong human clinical evidence is limited.
Q: Which peptide is best for weight loss?
A: GLP-1 drugs (like semaglutide) have the strongest evidence.
Q: Are peptide therapies safe?
A: Approved peptide drugs are generally well studied. Many other peptides have limited safety data.
Q: Are peptides legal?
A: Approved peptide medicines are legal by prescription. Many others exist in grey or restricted markets depending on the country.
Q: Why are peptides so popular now?
A: They target high-demand areas like weight loss, recovery, and longevity — often faster than traditional medicine adapts.
Q: Are all peptides injectable?
A: Most commonly marketed peptides are injectable, which raises additional safety and quality concerns.
Related Guides
Overviews
- Peptide Therapy: What It Is, How It Works, and Safety Considerations
- GLP-1 Weight Loss Drugs: How They Work, Benefits, and Risks
Compound deep-dives