Don't miss our holiday offer - up to 50% OFF!
Product Quality
Purity, testing, and verification.
How we verify what's in every vial, what the numbers mean, and how to confirm them yourself.
What purity standards do your peptides meet?
+
Our specification requires minimum 98% purity verified by third-party HPLC analysis. Most batches test between 98.5–99.9%. Every batch is independently tested before release. We reject any batch below 98% purity and it never enters our inventory.
All purity results are published in our COA Vault, accessible using the batch number printed on your vial label.
How are your peptides tested?
+
Every batch runs through a seven-method analytical panel at Krause Analytical: HPLC, mass spectrometry, endotoxin (LAL), heavy metals (ICP-MS), microbial bioburden, pH stability, and visual inspection.
How do I read and interpret a Certificate of Analysis?
+
Every COA lists the batch number, test date, HPLC purity result, molecular weight confirmation, and the full contamination panel. See our "Reading a COA" guide for a field-by-field walkthrough.
What is the difference between research-grade and pharmaceutical-grade peptides?
+
Pharmaceutical-grade peptides undergo FDA drug-approval review for human use. Research-grade peptides are manufactured for laboratory investigation only and are not subject to that review process.
Why do some peptide vials appear almost empty?
+
Lyophilized peptide is a very small mass relative to the vial size. A visually "empty-looking" vial commonly still contains the full labeled quantity — this is normal for freeze-dried research compounds.
What does "net peptide content" mean?
+
Net peptide content refers to the actual peptide mass excluding salts, moisture, and counter-ions that are part of the raw synthesized material. It's a more precise measure than gross vial weight.
Can I verify your COAs are authentic?
+
Yes — every COA lists Krause Analytical's direct contact information. You can call the lab and confirm any batch result independently.
Handling & Storage
Maintaining batch integrity.
Storage conditions, stability windows, and the indicators that suggest a batch may have degraded.
How should I store lyophilized peptides?
+
Store unopened, lyophilized peptides at −20°C or colder in a sealed container with desiccant, protected from light and humidity. Under these conditions, most peptides remain stable for 24+ months. Keep vials in airtight, opaque containers away from direct sunlight.
Temperature fluctuations degrade peptides. Freezer storage in a standard −20°C laboratory freezer is ideal. Avoid freeze-thaw cycles. If −20°C storage isn't available, refrigeration at 2–8°C will keep peptides stable for 3–6 months.
How long does a reconstituted peptide solution remain stable?
+
Reconstituted solutions should be refrigerated at 2–8°C and used within 1–2 weeks. Stability varies by peptide — check the specific guidance on each product's COA.
How can I tell if my peptides have degraded?
+
Signs of degradation include cloudiness or discoloration in reconstituted solution, an off odor, or a change in the lyophilized cake's appearance. If in doubt, our testing service can verify a sample independently.
Legal & Compliance
Regulatory framework.
The legal status of research peptides, FDA classification, and what "research use only" means in practice.
Are research peptides legal to purchase?
+
Yes. Research peptides are legal to purchase within the United States for legitimate in-vitro laboratory research purposes. They are not classified as controlled substances under federal law. OPTMZ Peptides operates in compliance with all applicable federal, state, and local regulations governing research chemical sales.
All products are clearly labeled "For Research Use Only — Not for Human or Animal Consumption." Legality may depend on state regulations and intended use. If you have specific regulatory questions about your jurisdiction, consult your local regulatory authority.
Are your products FDA-approved?
+
No. Research peptides are not FDA-approved for human or animal use, and are not subject to FDA drug-approval review. They are intended strictly for laboratory research applications.
What does "for research use only" mean?
+
It means the product is intended exclusively for in-vitro laboratory research and is not to be used, administered, or consumed by humans or animals in any capacity.
Do you ship internationally?
+
Shipping availability varies by destination and local regulations. Check available shipping options at checkout for your location.
Are there age restrictions on purchasing?
+
Yes, purchasers must be of legal adult age in their jurisdiction to place an order for research use products.
Orders & Shipping
Payment, shipping, and returns.
How we process orders, package shipments, and handle returns or quality issues.
What payment methods do you accept?
+
We accept major credit and debit cards (Visa, Mastercard, American Express) through our secure payment processor. Additional payment methods may be available during checkout depending on your location and processor availability.
All payments are processed securely with SSL encryption and PCI compliance. Your card information is never stored on our servers.
Is your checkout secure?
+
Yes — checkout is fully encrypted with SSL and processed through a PCI-compliant payment gateway.
How long does shipping take?
+
Standard processing and shipping typically takes a few business days from order confirmation. Exact timing depends on your location and selected shipping method.
How much is shipping?
+
Shipping cost is calculated at checkout based on destination, package weight, and selected shipping speed.
How are peptides packaged for shipment?
+
Peptides are shipped in temperature-appropriate, discreet packaging with tamper-evident seals to protect product integrity in transit.
What is your return and refund policy?
+
Due to the nature of research compounds, returns are handled on a case-by-case basis. Contact research support if you have a quality concern with a received order.
Can I track my order?
+
Yes — a tracking number is provided by email once your order ships.
Peptide Science
Background and terminology.
What research peptides are, how they're synthesized, and where to find peer-reviewed literature.
What are research peptides?
+
Peptides are short chains of amino acids — the building blocks of proteins. Research peptides are synthetic peptides manufactured for laboratory investigation. Unlike pharmaceutical peptides (which undergo FDA drug approval), research peptides are studied in controlled laboratory settings to understand their properties, mechanisms, and potential applications.
Research peptides are essential tools in biochemistry, molecular biology, and biomedical research. They allow scientists to study protein interactions, signal pathways, and cellular mechanisms in isolation.
What is the difference between peptides and SARMs?
+
Peptides are short amino acid chains, while SARMs (Selective Androgen Receptor Modulators) are a distinct class of synthetic compounds that target androgen receptors. They differ in chemical structure, mechanism, and research application.
What peptides do you currently offer?
+
Our full, current catalog is available on the Shop page, with each product's Certificate of Analysis linked directly on its product page.
How are peptides synthesized?
+
Most research peptides are produced via solid-phase peptide synthesis (SPPS), a method that builds the amino acid chain step-by-step on a solid resin support before purification.
Where can I find research about specific peptides?
+
Peer-reviewed literature is available through databases such as PubMed and Google Scholar. Search by the peptide's chemical name or CAS number for the most relevant published studies.