Peptide FAQ: Your Questions Answered

This peptide FAQ answers the questions we see most often from researchers, first-time buyers and people trying to separate published data from social media noise. Every answer is pulled from published studies, product pages and regulatory filings. Where the evidence is incomplete, this page says so directly. If your question is not here, check our individual guides linked throughout this page.

General Peptide Questions

What is a peptide?

A peptide is a short chain of amino acids, typically fewer than 50, linked by peptide bonds. Your body makes thousands of peptides naturally. Research peptides are synthetic versions of natural sequences or novel designs, manufactured in a laboratory and sold as lyophilized powder.

What is BPC-157?

BPC-157 is a 15-amino-acid synthetic peptide derived from a protein found in human gastric juice. Over 100 preclinical studies have examined its effects in animal models across tissue types including gut, tendon, muscle and nerve. No completed human clinical trial exists. For a detailed overview, see our BPC-157 peptide therapy guide.

What does "research peptide" mean?

A research peptide is a compound sold exclusively for laboratory investigation. The label states "for research use only" and the vendor makes no therapeutic claims. This classification means the product has not been approved by the FDA or any regulatory body for human use.

How many peptides exist?

Thousands of peptide sequences have been described in the scientific literature. The subset sold commercially as research chemicals includes roughly 30 to 50 commonly available compounds. We cover the seven most studied in our catalog: BPC-157, TB-500, GHK-Cu, MOTS-c, Ipamorelin, Epithalon and Tesamorelin.

What is the difference between a peptide and a protein?

The distinction is length. Peptides are generally shorter than 50 amino acids. Proteins are longer and fold into complex three-dimensional structures. BPC-157 at 15 amino acids is firmly in peptide territory. Insulin at 51 amino acids sits on the boundary.

Safety and Regulation

Are peptides safe?

No controlled human trial has established the safety profile of most research peptides. BPC-157 has an extensive animal safety record with no observed adverse effects across multiple species. A 2025 pilot study gave BPC-157 intravenously to two human subjects at doses up to 20 mg with zero adverse events. That is promising but far too small to confirm safety. See our full safety guide for the complete data.

Is BPC-157 FDA-approved?

No. BPC-157 has not been approved by the FDA for any indication. In 2024, the FDA moved to exclude it from the list of bulk drug substances eligible for pharmacy compounding. It remains available as a research chemical.

Is BPC-157 banned by WADA?

Yes. WADA added BPC-157 to its prohibited list under S0 (Non-Approved Substances) in January 2022. Competitive athletes subject to anti-doping testing should not use this compound. TB-500 and Ipamorelin are also prohibited under S2.

Can I legally buy peptides in the US?

Research peptides labeled "for research use only" are legal to purchase in the United States. No prescription is required for this category. Buyers face no legal consequences for the purchase itself.

Are there side effects?

Animal studies of BPC-157 have not identified consistent side effects at any dose tested. Community reports from self-experimenters occasionally mention headaches, nausea and fatigue, but these reports are uncontrolled and may reflect product quality issues rather than peptide effects. No formal adverse event database exists for research peptides.

Can I take peptides with my medications?

No formal drug interaction study exists for any research peptide. BPC-157 affects nitric oxide and dopamine pathways in animal models, which creates theoretical interaction potential with blood pressure medications, SSRIs and anticoagulants. Discuss any peptide with your prescribing physician before combining it with existing medications.

Buying and Storage

Where can I buy peptides?

We list vendors who sell research peptides to US buyers in our where to buy peptides guide. Peptide God offers BPC-157 at $34.95. Real Peptides sells BPC-157 10 mg at $43.20 with published COA. Topical GHK-Cu products are available from Neurogan Health and Scantifix without reconstitution requirements.

What is a COA and why does it matter?

A Certificate of Analysis documents the purity, identity and safety testing of a specific product lot. It should include HPLC purity percentage (99%+ target), mass spectrometry identity confirmation and endotoxin data. Without a COA, the buyer has no way to verify that the vial contains what the label claims.

How should I store peptides?

Lyophilized (freeze-dried) peptides are stable at room temperature for short periods, which is why vendors ship them without cold packs. For long-term storage, keep sealed vials at -20C. Once reconstituted with bacteriostatic water, refrigerate at 2-8C and use within 28 days. Do not freeze reconstituted solutions.

What is bacteriostatic water?

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. It is used to reconstitute lyophilized peptide powder into an injectable solution. Real Peptides sells a 10 ml vial for $4.80. Replace bacteriostatic water 28 days after first puncture.

Do peptides need to be refrigerated during shipping?

Lyophilized powder does not require cold-chain shipping. The dry form is stable for several days at ambient temperatures. Most US vendors ship via standard carriers with 1 to 3 day delivery. Reconstituted peptides do require refrigeration.

Dosage and Use

How do I reconstitute a peptide?

Add bacteriostatic water slowly down the inside wall of the vial. Do not shake. Let the water flow onto the lyophilized cake and swirl gently until dissolved. The volume of water you add determines the concentration per unit volume. Use our reconstitution calculator for the arithmetic.

What dose of BPC-157 do researchers use?

Published animal studies typically use 10 mcg/kg body weight administered intraperitoneally or subcutaneously. This site reports study protocols but does not recommend human dosing. The 2025 human pilot used intravenous doses up to 20 mg total, which is substantially higher than animal weight-adjusted equivalents. No dose-finding study in humans has been completed.

How long do people use peptides?

Community protocols commonly range from 4 to 8 weeks. This convention is not based on published clinical data. Animal studies have tested BPC-157 for up to 24 months without cumulative toxicity, but rodent lifespans differ substantially from human lifespans. Long-term safety in humans is an open question.

Can BPC-157 be taken orally?

BPC-157 is unusual among peptides in that it shows stability in stomach acid at pH 1-2 for over 24 hours in laboratory tests. Published animal studies have demonstrated effects with oral administration for gut-related endpoints. Other peptides such as TB-500 and Ipamorelin are not acid-stable and are administered by injection in research settings.

Product Questions

What is the difference between Peptide God and Real Peptides?

Peptide God offers lower prices (BPC-157 at $34.95) but publishes no COA or purity data. Real Peptides charges more (BPC-157 10 mg at $43.20) and includes lot-specific COAs with HPLC and endotoxin testing. See our vendor comparison for the full breakdown.

What is the BPC-157 + TB-500 stack?

Peptide God sells a pre-blended vial of BPC-157 and TB-500 at $59.95. Both peptides have been studied separately in animal models for tissue repair. No published study has tested the combination in the same animals or humans. The blend offers convenience but removes the ability to adjust individual ratios.

Are topical peptides the same as injectable peptides?

Topical formulations like GHK-Cu creams deliver the peptide to the skin surface. They do not enter systemic circulation in meaningful amounts. Injectable peptides are reconstituted from lyophilized powder and administered subcutaneously, reaching systemic levels. These are different delivery routes with different applications. We compare them on our topical vs. vial peptides page.

Do I need a prescription for peptide therapy?

Research peptides labeled "for research use only" do not require a prescription. Physician-supervised peptide therapy through telehealth platforms such as DoctorDerm and Arc-1 does involve a prescription or consultation. These are separate access pathways with different levels of medical oversight.

For storage best practices, see our peptide storage and handling guide. For reconstitution math, use our peptide calculator.

Discuss any peptide product with a qualified physician before use. The products described on this site are sold for laboratory and research purposes and are not approved for human therapeutic use by any regulatory agency.