What Are Peptides? A Beginner's Guide
Everything you need to know about peptides — what they are, how they work, and why researchers use them.
What Exactly Are Peptides?
Peptides are short chains of amino acids — the same building blocks that make up proteins. While proteins can contain hundreds or thousands of amino acids, peptides are typically between 2 and 50 amino acids long. This smaller size gives them unique properties that make them valuable tools in research.
Your body naturally produces hundreds of peptides. They act as signaling molecules, telling cells what to do — repair tissue, modulate immune function, regulate hormones, and more.
How Do Peptides Work?
Peptides work by binding to specific receptors on cell surfaces, triggering biological responses. Think of them as keys that fit specific locks in your body. When a peptide binds to its receptor, it activates a cascade of cellular events.
Different peptides target different systems:
- Recovery peptides like BPC-157 promote tissue repair and reduce inflammation
- Skin peptides like GHK-Cu stimulate collagen production and skin remodeling
- Cognitive peptides like Selank modulate neurotransmitter activity and BDNF expression
Natural vs. Synthetic Peptides
Your body produces peptides naturally, but researchers also synthesize them in laboratories. Synthetic peptides are identical in structure to their natural counterparts but can be produced in precise doses for research applications.
The purity of synthetic peptides is critical. At Peptide Concierge, every batch is third-party tested with purity levels typically exceeding 98%.
Common Administration Methods
Peptides can be administered in several ways, each with different absorption characteristics:
- Injectable (subcutaneous): Highest bioavailability. The peptide goes directly into tissue beneath the skin.
- Nasal spray: Good absorption through the nasal mucosa. Non-invasive and easy to dose.
- Oral: Convenient but lower bioavailability — stomach acids can break down some peptides.
- Topical: Applied to skin for localized effects. Common for skin-focused peptides like GHK-Cu.
What to Look for in a Peptide Supplier
Quality matters enormously with peptides. Here's what to look for:
- Certificate of Analysis (COA): Every batch should come with a third-party COA verifying purity and identity.
- GMP-compliant manufacturing: The facility should follow Good Manufacturing Practice standards.
- Transparent sourcing: The supplier should be open about where and how peptides are produced.
- Proper storage and shipping: Peptides are sensitive to heat and light. Cold-chain shipping is important.
Getting Started
If you're new to peptides, start with well-researched compounds that have extensive safety data. BPC-157, GHK-Cu, and Selank are popular starting points due to their favorable safety profiles and broad research backing.
Use our Find Your Peptide quiz to get personalized recommendations based on your goals and experience level.