Peptide Lyophilized Vial (251mg - 500mg)

Peptides are short sequences of amino acids found naturally in the body, where they contribute to a range of biological functions. All products we offer are intended exclusively for laboratory research use.

Here is the link to your account page where you can manage all of your subscriptions. Click on "Subscriptions" on the left-hand menu, about halfway down. You can cancel any subscription at any time, but you can also resubscribe, or subscribe to new products, at any time. Just find the subscription you wish to discontinue and click "cancel."

All products sold by Peptide Scientific Labs are intended for laboratory research use only and are considered final sale.

Due to the sensitive and perishable nature of these materials, we do not accept returns, exchanges, or refunds once an order has been shipped.

If your order arrives damaged, incorrect, or incomplete, you may be eligible for a replacement shipment or store credit under our 48-Hour Delivery Guarantee. To qualify, you must contact us within 48 hours of delivery and provide your order number along with clear photos of the issue.

On any qualifying product, click Subscribe & Save 10%, then choose frequency: every 1 month, every 2 months, or every 3 months.

The following credit cards are currently accepted on our website: Visa, Mastercard, and Discover.

Whenever you wish to cancel an order, please contact us at (561) 652-9166 as soon as possible. Once your order has been shipped, we cannot accept cancellations. Once your order has been shipped, you can begin the refund process by logging into your account. Most unopened products are eligible for a 30 day refund or exchange. Our refund policy lasts 30 days after the delivery date has passed. For more information on our refund policy, click here. 

Peptides sit at a useful intersection between chemistry and biology. They are large enough to carry highly specific biological information, yet small enough to be synthesized precisely in a laboratory. That combination makes them powerful tools across a wide range of research areas — including receptor binding studies, mapping of signaling pathways, development of analytical reference standards, and investigation of cellular processes such as metabolism, immune regulation, tissue maintenance, and cell communication. Their specificity and structural tunability are exactly what make peptides a central subject of modern biochemistry, pharmacology, and molecular biology research.

A polypeptide is a single, unbranched chain of amino acids joined together by peptide bonds. It is essentially a longer peptide. Shorter chains — typically between 2 and 50 amino acids — are usually called peptides, while longer chains are called polypeptides. When one or more polypeptide chains fold into a stable, functional three-dimensional structure, the result is what we call a protein. So the progression goes: amino acid → peptide → polypeptide → protein. The exact length cutoffs between these terms are not strictly defined and can vary between sources.

No. Peptides and steroids are two entirely different classes of molecules with different chemistry, structure, and mechanism of action. Peptides are short chains of amino acids linked by peptide bonds — they are typically water-soluble and interact with receptors on the surface of the cell. Steroids, by contrast, are lipid-based compounds built around a four-ring carbon skeleton derived from cholesterol; they usually cross the cell membrane and bind to receptors inside the cell. Their regulatory classification also differs significantly. In short, a peptide is not a steroid, and calling one a version of the other is scientifically inaccurate.

Throughout the entire life cycle of our cannabinoids and supplements, Peptide Scientific Labs carefully supervises everything from seed to sale, ensuring quality. That's our guarantee of safety and transparency.

Our lab reports are available here.