Cortagen

Cortagen is a lab-made brain-cortex tetrapeptide — a small molecule built from four amino-acid building blocks — in the Khavinson bioregulator family of short regulatory peptides. It appears in neural and anti-aging research literature and is supplied lyophilized, so it must be reconstituted before any laboratory workflow.

This article is a reference overview, not a protocol. It covers what Cortagen is, where it sits in the research literature and how the compound is categorized, the general reconstitution math and diluent volumes you need, compound-specific handling notes for Cortagen, and the hardware you pair it with — reference pen, 3 ml cartridge, and screw-on pen needle.

Hardware fit (asked often): Our pens take standard 3 ml (300-unit) glass cartridges with the 11 mm long plunger (stopper), the cartridge we sell. 3 ml cartridges are also made with a shorter, about 8 mm plunger, and a pen is built for one height, so check that a cartridge from another source has the 11 mm long plunger before loading it; the glass looks identical from the outside. Pen-needle fit is universal across 28G–33G screw-on tips. We have not tested other manufacturers' cartridges, pens, or needles, so we cannot confirm cross-brand fit — questions about pen model differences and third-party compatibility are answered in the FAQ section.

What it is

Cortagen is a synthetic short-chain peptide supplied for laboratory study. A peptide is a short chain of amino acids — the same building blocks proteins are made from — linked in a defined sequence. Each peptide is named by listing its amino acids in order, so the same four amino acids written in a different order would describe a different molecule.

Where the "bioregulator" label comes from

Members of the Khavinson family were developed by studying peptide extracts prepared from specific body tissues, with each family member corresponding to one source tissue. Cortagen is the synthetic fragment researchers associate with the cortexin extract from the brain cortex, and that link to a named tissue extract is what places it in the bioregulator family. It is supplied as a research-only material — not for administration.

Key point: Cortagen is an unapproved, research-only synthetic tetrapeptide (AEDP) in the Khavinson bioregulator family.

All of our reusable peptide pens (V1, V2, V3 and Gansulin) are compared on one page.

Research context and categorization

Cortagen is a short synthetic peptide developed by Professor Vladimir Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology. It is generally categorized as a neural or cortex-related bioregulator and sits within the tissue-specific peptide literature, separate from the metabolic and incretin-mimetic classes that include compounds like tirzepatide and semaglutide.

Where it sits in peptide research

• Class: Short synthetic peptide studied as a tissue-specific bioregulator — a peptide believed to interact with a narrow tissue type.
• Origin: Developed by the Khavinson group at the St. Petersburg Institute of Bioregulation and Gerontology.
• Framing: Often discussed under the "bioregulator hypothesis" — the idea that very short peptides may influence gene expression (the process by which genes in a cell are switched on or off) in specific tissue types, like small keys fitting particular cellular locks.

Investigational areas

Published laboratory and animal-model work has explored topics such as:

• Peripheral nerve regeneration (regrowth of nerves outside the brain and spinal cord) after injury.
• Responses to reduced blood flow in neural tissue.
• Gene-activity patterns in cortical tissue and aging models, including a published microarray study (a lab test that checks many genes' activity at once).

Regulatory status

Cortagen is a research compound. PreppinPeppers sells research hardware (pens, cartridges and bacteriostatic water) and does not sell Cortagen. It has not been reviewed or authorized by the U.S. FDA, and the effects described above are research observations, not confirmed or approved outcomes in humans. They represent ongoing areas of study and should be read as research findings only.

Status

Cortagen is supplied strictly for in-vitro research. It is not approved, and is not sold, for human or animal use.

• Regulatory: Not approved by the U.S. Food and Drug Administration for any indication. Sold as a research compound only - not a drug, dietary supplement, or cosmetic.
• Sport (WADA): Cortagen is not specifically named on the WADA Prohibited List. WADA includes a catch-all category called S0 covering any substance not currently approved by a government health authority for human therapeutic use. Because Cortagen is an unapproved experimental peptide, that provision may apply. Anyone subject to anti-doping rules should confirm current status directly with WADA or their governing body.
• Scope of supply: For laboratory and in-vitro research by qualified research personnel. Not intended, labelled, or supplied for administration to humans or animals.

Reconstitution notes (general)

Reconstitution dissolves a lyophilized powder into a diluent to form a liquid. The resulting concentration equals milligrams of peptide divided by millilitres of diluent; a 20 mg vial brought up in 3 mL yields roughly 6.67 mg/mL. For other vial sizes, use the peptide calculator.

Hardware fit. Our pens take standard 3 ml (300-unit) glass cartridges with the 11 mm long plunger (stopper), the cartridge we sell. 3 ml cartridges are also made with a shorter, about 8 mm plunger, and a pen is built for one height, so check that a cartridge from another source has the 11 mm long plunger before loading it; the glass looks identical from the outside. Cartridge and pen fit have only been verified on our own hardware, so compatibility with third-party cartridge or pen designs has not been tested.

Diluent and stability. Bacteriostatic water contains benzyl alcohol, and peptide stability in solution varies with the specific peptide, concentration, and storage temperature. Colour shifts after reconstitution — for example, GHK-Cu fading from blue toward a paler tone — reflect normal reduction chemistry and are typically expected.

Dilution and handling notes (compound-specific)

Solubility and Appearance

Cortagen is supplied as a lyophilized powder in research vials such as 10 mg, 20 mg, or 50 mg, intended for reconstitution with bacteriostatic water for laboratory workflows. Because Cortagen is a small tetrapeptide with no cysteine residues or disulfide bonds, it dissolves readily into a clear, colorless liquid; cloudiness or particulates are not expected at typical working concentrations.

Researchers sometimes ask why reconstituted peptides change color. A GHK-Cu vial shifting from blue toward clear usually reflects a pH-driven chromophore shift rather than immediate degradation. Cortagen itself is colorless, so any persistent tint or haze is worth checking against the certificate of analysis.

Typical reconstitution volumes fall in the low single-digit millilitre range (for example, 2–3 mL per 20 mg vial, yielding roughly 6.67–10 mg/mL). Diluent volume sets concentration.

Handling Workflow

1. Add diluent slowly down the inner glass wall, not directly onto the powder bed.
2. Let the vial stand briefly, then swirl gently.
3. Swirl gently until clear; avoid vigorous shaking, which introduces foam.
4. If particulates persist after gentle swirling, set the vial aside rather than continuing agitation.
5. Avoid repeated freeze-thaw cycles; aliquot before storage.

Bacteriostatic Water and Stability

Bacteriostatic water (0.9% benzyl alcohol) is a standard diluent for multi-use research vials. A common question is whether benzyl alcohol degrades peptides in solution; at typical use concentrations it does not meaningfully degrade small tetrapeptides such as Cortagen over short-term storage. Sterile water for injection is a preservative-free option.

Hardware Compatibility

Our pens take standard 3 ml (300-unit) glass cartridges with the 11 mm long plunger (stopper), the cartridge we sell. 3 ml cartridges are also made with a shorter, about 8 mm plunger, and a pen is built for one height, so check that a cartridge from another source has the 11 mm long plunger before loading it; the glass looks identical from the outside. The matching needle format is 28G-33G screw-on pen needles.

Two recurring hardware questions — which cartridges fit, and whether the same cartridges work with other manufacturers' pens — both reduce to the fit spec above. We have not tested third-party hardware, so cross-brand cartridge fit is not something we can verify. Verify cartridge dimensions before loading.

Handling and storage

After reconstitution, store the vial upright in a refrigerator at 2 to 8 °C, shielded from direct light. Discard any remaining solution after roughly four weeks under refrigeration, regardless of volume left in the vial.

Cartridge fit

Our pens take standard 3 ml (300-unit) glass cartridges with the 11 mm long plunger (stopper), the cartridge we sell. 3 ml cartridges are also made with a shorter, about 8 mm plunger, and a pen is built for one height, so check that a cartridge from another source has the 11 mm long plunger before loading it; the glass looks identical from the outside. We have not tested third-party cartridges or third-party pens, so those pairings cannot be confirmed.

Needle fit

Our pens accept any universal 28G–33G screw-on pen needle; attach a fresh needle before each session.

Handling workflow

• Wipe the rubber stopper with an isopropyl alcohol swab before every puncture.
• Mark the reconstitution date on the vial at the time of mixing.
• Return the vial to refrigeration promptly after each withdrawal; avoid freezing the reconstituted solution.
• Discard any vial that becomes cloudy, discolored, or develops visible particles.

Frequently asked questions