Frequently Asked Questions
Welcome to the Spartan Peptides FAQ. Below you’ll find answers to our most common research questions. If you don’t see what you’re looking for, contact our research team directly.
General Questions
What are peptides?
Peptides are short chains of amino acids — the same building blocks that make up proteins — typically consisting of 2 to 50 amino acid residues linked by peptide bonds. They occur naturally throughout the body and play critical roles in cellular signaling, hormone regulation, immune function, tissue repair, and much more. Because of their targeted biological activity and relatively small molecular size, peptides have become a major focus of scientific research across many fields, including endocrinology, immunology, and regenerative medicine.
At Spartan Peptides, all products are sold as research-grade compounds for laboratory and in-vitro use only. Browse our full peptide catalog to explore available compounds.
How do I reconstitute peptides?
Most lyophilized (freeze-dried) research peptides are reconstituted using bacteriostatic water (BAC water), sterile water, or a dilute acetic acid solution (0.1–1%), depending on the specific peptide’s solubility profile. General steps for reconstitution in a laboratory setting:
- Allow the vial to reach room temperature before opening to prevent condensation.
- Use a sterile syringe to add the reconstitution solvent slowly down the side of the vial — do not inject directly onto the lyophilized powder.
- Gently swirl (do not shake vigorously) until fully dissolved. Peptides should produce a clear solution in most cases.
- Label with the date of reconstitution and store reconstituted peptides refrigerated (2–8°C) unless your protocol specifies otherwise.
Always consult the specific product’s COA and relevant published literature for compound-specific reconstitution guidance. Bacteriostatic water is recommended for most applications as it extends the usable shelf life of the reconstituted solution.
How should peptides be stored?
Proper storage is critical to maintaining peptide integrity. As a general guideline:
- Lyophilized (dry) peptides: Store at −20°C (freezer) in a sealed container away from moisture and light. Properly stored lyophilized peptides can remain stable for 12–24 months.
- Reconstituted peptides: Store refrigerated at 2–8°C. Consume within 30 days for optimal potency, or freeze aliquots at −20°C for longer-term storage.
- Avoid repeated freeze-thaw cycles, which can degrade peptide structure and reduce purity.
- Keep vials sealed when not in use and away from direct light and humidity.
Specific storage requirements may vary by compound — always consult the product COA or contact our research team for compound-specific guidance.
Quality & Testing
What purity testing does Spartan Peptides perform?
Every batch of peptides sold by Spartan Peptides is tested using two independent analytical methods:
- High-Performance Liquid Chromatography (HPLC): Confirms peptide purity percentage and detects impurities. All Spartan Peptides products meet a minimum ≥98% purity threshold.
- Mass Spectrometry (MS): Verifies the molecular weight and identity of the compound, ensuring the peptide sequence matches its intended structure.
A Certificate of Analysis (COA) documenting these results is available for every product. You can find COA download links on individual product pages, or request a batch-specific COA from our quality team. We maintain in-house QC review processes before any batch is approved for sale.
How do I read a Certificate of Analysis?
A Certificate of Analysis (COA) is a document issued by an analytical laboratory confirming that a product meets specified quality standards. Key elements to review:
- Peptide name and sequence: Confirms the compound identity matches what you ordered.
- Molecular formula and molecular weight: Cross-reference with published literature to verify identity.
- HPLC purity (%): Should read ≥98% for Spartan Peptides products. This represents the percentage of the sample that is the target compound.
- Mass Spectrometry result: The measured mass should match the theoretical molecular weight (within instrument tolerance, typically ±1 Da).
- Batch/Lot number: Links the COA to the specific production batch of your vial.
- Test date: Indicates when analysis was performed. More recent dates are preferable.
If you have questions interpreting a COA for a specific compound, our research team is happy to assist. Reach out via our contact page.
Legal & Regulatory
Are peptides legal to purchase for research?
In the United States, many research peptides are legal to purchase, possess, and use in a legitimate laboratory or research context. They are sold as research chemicals — not as drugs, supplements, or products intended for human or animal consumption. The regulatory status of specific peptides varies and can change over time as agencies like the FDA reassess compounds.
Spartan Peptides sells all compounds strictly for in-vitro laboratory research use only. By purchasing, buyers affirm that products will be used solely in a controlled research environment in compliance with all applicable federal, state, and local laws. It is the buyer’s responsibility to understand the legal status of any compound in their jurisdiction before purchasing.
What is the difference between research peptides and pharmaceutical drugs?
Research peptides and pharmaceutical drugs differ in several important ways:
- Approval status: Pharmaceutical drugs have been through FDA clinical trials, reviewed for safety and efficacy, and approved for specific medical indications. Research peptides have not necessarily completed this regulatory pathway.
- Intended use: Pharmaceutical drugs are prescribed for diagnosis, treatment, or prevention of disease in humans. Research peptides are intended for laboratory study — not for human consumption.
- Quality and manufacturing standards: FDA-approved drugs are manufactured under strict GMP (Good Manufacturing Practice) standards with pharmaceutical-grade QC. Research peptides are tested for purity but not manufactured to pharmaceutical GMP standards.
- Labeling: Research peptides are explicitly labeled “Not for Human Consumption” and “For Research Use Only.”
Researchers interested in the therapeutic potential of peptides should consult peer-reviewed literature and, where applicable, seek appropriately approved clinical compounds through licensed medical channels.
Ordering & Shipping
How long does shipping take?
Most orders ship within 1–2 business days of payment confirmation. Domestic US shipping typically takes 2–5 business days via our standard carrier partners, depending on your location. Expedited shipping options may be available at checkout. Orders are packaged with appropriate cold-chain handling (cold packs as needed) to maintain peptide integrity during transit.
You will receive tracking information via email once your order ships. For questions about order status, please contact our support team.
Do you ship internationally?
At this time, Spartan Peptides primarily serves customers within the United States. International shipping availability may vary depending on the destination country’s import regulations, customs requirements, and the legal status of specific compounds in that jurisdiction. Please contact us before placing an international order to confirm availability and discuss any restrictions that may apply.
It is the buyer’s sole responsibility to ensure that the importation of research compounds is lawful in their country. Spartan Peptides does not assume liability for shipments held or seized by customs.
What is your return policy?
Given the nature of research compounds, Spartan Peptides has a strict quality guarantee policy. If you receive a product that is damaged, incorrectly shipped, or fails to meet the purity specifications on the COA, please contact us within 7 days of receipt with your order number and a description of the issue. We will work to resolve the matter promptly, which may include a replacement or store credit.
We are unable to accept returns of opened or used products. For questions about our policy or to report an issue, contact our customer service team.