Beginner's Guide to Peptides
Everything you need to know about research peptides — what they are, how they work, how they're used, and how to get started safely.
What Are Peptides?
Peptides are short chains of amino acids — typically between 2 and 50 amino acids long — linked by peptide bonds. They are essentially small proteins. Your body naturally produces thousands of peptides that serve as signaling molecules, hormones, and regulators of biological processes.
When people refer to "peptides" in the context of biohacking, research, or therapeutic use, they typically mean synthetic versions of these naturally occurring compounds — manufactured to target specific biological pathways.
How Do Peptides Work?
Peptides work by mimicking or modulating your body's own signaling systems. Rather than introducing foreign substances, they speak the body's native chemical language. Here are the main mechanisms:
Hormone Stimulation
Some peptides signal the pituitary gland to release growth hormone (GH secretagogues like CJC-1295 and Ipamorelin).
Tissue Repair
Healing peptides like BPC-157 and TB-500 promote angiogenesis, cell migration, and growth factor expression to accelerate recovery.
Receptor Agonism
GLP-1 receptor agonists (Semaglutide, Tirzepatide) bind to specific receptors to regulate appetite, insulin, and metabolism.
Neurotransmitter Modulation
Nootropic peptides (Semax, Selank) influence BDNF, dopamine, and serotonin pathways to enhance cognitive function.
Immune Regulation
Immunomodulatory peptides (Thymosin Alpha-1, LL-37) enhance T-cell activity, cytokine balance, and antimicrobial defense.
Major Peptide Categories
Peptides are typically grouped by their primary function. Most peptides have effects across multiple categories — these groupings reflect their primary studied application. Browse all categories.
Growth Hormone Secretagogues
Stimulate natural GH release. Includes GHRH analogs (CJC-1295, Sermorelin) and ghrelin receptor agonists (Ipamorelin, GHRP-2, GHRP-6). Used for recovery, body composition, anti-aging, and sleep quality.
Healing & Recovery
BPC-157 and TB-500 are the cornerstone healing peptides. They promote tissue repair across tendons, ligaments, muscles, and gut. The "Wolverine Stack" (BPC-157 + TB-500) is the most popular recovery protocol.
Weight Loss & Metabolic
GLP-1 receptor agonists (Semaglutide, Tirzepatide) have revolutionized the peptide landscape. Also includes AOD-9604 and Tesamorelin for targeted fat reduction.
Cognitive & Nootropic
Semax and Selank (Russian-developed nootropic peptides) lead this category, delivered nasally for direct CNS access. Dihexa and Cerebrolysin are also studied for cognitive enhancement and neuroprotection.
Anti-Aging & Longevity
Epithalon (telomere support), GHK-Cu (copper peptide regeneration), MOTS-c (mitochondrial peptide), and Humanin target multiple aging pathways. See our Longevity Protocol stack.
Immune Support
Thymosin Alpha-1 (FDA-approved in some countries) is the gold standard immune peptide. LL-37 provides broad-spectrum antimicrobial defense. KPV modulates gut and systemic inflammation.
How Peptides Arrive & Are Stored
Research peptides are typically supplied as lyophilized (freeze-dried) powder in sealed glass vials. This form is extremely stable when stored properly.
Lyophilized Powder
The standard form. A dry, fluffy powder at the bottom of a glass vial sealed with a rubber stopper and aluminum crimp. Must be reconstituted with bacteriostatic water before use.
Pre-Mixed Solutions
Some peptides come pre-reconstituted in solution form. Less common for research peptides but standard for pharmaceutical products like Semaglutide injection pens.
Storage Guidelines
| Form | Temperature | Shelf Life | Notes |
|---|---|---|---|
| Lyophilized (unreconstituted) | -20°C (freezer) ideal, 2–8°C acceptable | 2+ years | Protect from light and moisture |
| Reconstituted with BAC water | 2–8°C (refrigerator) | 28–30 days | Never freeze reconstituted peptides |
| Nasal spray | 2–8°C (refrigerator) | 30–60 days | Varies by manufacturer |
| Oral capsules | Room temp or refrigerated | Varies | Check packaging label |
How Peptides Are Made
Most research peptides are manufactured using one of two primary methods. Read the full synthesis guide for detailed information.
Solid-Phase Peptide Synthesis (SPPS)
The most common method for short peptides (up to ~50 amino acids). Amino acids are added one at a time to a growing chain attached to a solid resin. Developed by Robert Bruce Merrifield, who won the Nobel Prize for this work. Allows precise control over sequence and purity (typically ≥95–98%).
Recombinant DNA Technology
Used for larger peptides and proteins. Involves inserting a gene encoding the desired peptide into bacteria (usually E. coli) or yeast cells, which then produce the peptide as they grow. Used for compounds like insulin, growth hormone, and IGF-1 LR3.
Getting Started: First Steps
-
Research Your Goal
Browse by category to find peptides matching your research interest — recovery, cognition, metabolic health, longevity, etc.
-
Start With One Peptide
Begin with a single, well-studied compound. BPC-157 and Ipamorelin are common entry points due to their favorable safety profiles and extensive preclinical data.
-
Learn Reconstitution
If using lyophilized peptides, learn proper reconstitution technique. Use our Reconstitution Calculator and step-by-step guide.
-
Understand Administration
Read our Routes of Administration guide to choose the right delivery method for your peptide.
-
Consider Stacking Later
Once comfortable with a single peptide, explore stacking protocols for synergistic effects. Start with simple 2-compound stacks.
-
Track and Monitor
Keep logs of doses, timing, and effects. Consider baseline bloodwork (IGF-1, metabolic panel, CBC) before starting and at 4–8 week intervals.
Safety & Legal Considerations
- Purity matters. Third-party testing (HPLC, mass spectrometry) verification is essential for quality assurance.
- Sterile technique. When handling injectables, maintain sterile conditions — alcohol swabs, clean workspace, single-use syringes.
- Start low. Begin at the lower end of published dose ranges and increase gradually.
- Cycle properly. Most peptides should be cycled (4–8 weeks on, 2–4 weeks off) to prevent receptor desensitization.
- Monitor biomarkers. Regular bloodwork helps track efficacy and catch any adverse effects early. See our biomarker monitoring guide.
- Competitive athletes: Many peptides are banned by WADA, NCAA, and professional sports organizations. Check current prohibited substance lists.
Peptides vs. SARMs
Peptides and SARMs (Selective Androgen Receptor Modulators) are often discussed together in biohacking circles, but they work very differently. Read our full comparison.
| Factor | Peptides | SARMs |
|---|---|---|
| Mechanism | Signal through natural hormone pathways | Directly bind androgen receptors |
| Hormone Suppression | Generally minimal — work with natural production | Can suppress testosterone 20–50%+ |
| Liver Risk | Generally low hepatic concern | Documented cases of liver injury |
| FDA Status | Some FDA-approved (Semaglutide, Tesamorelin) | None approved — explicit FDA warnings |
| Approach | Indirect, physiological, multi-pathway | Direct, targeted, single receptor |
| Speed of Results | Gradual, building over weeks | Faster, more noticeable short-term |