What is Cortexin?
Cortexin is a complex of water-soluble polypeptide fractions extracted from the cerebral cortex of young farm animals; the name comes from “cortex.” It was developed in Russia, where it is marketed as a medicine, and it is supplied as a freeze-dried (lyophilized) powder. Like Cerebrolysin, it is a mixture rather than one defined sequence. This Cortexin page exists for one reason: to turn the label on a vial into concentration and syringe-unit arithmetic.
Research interest in Cortexin has been concentrated in Russian-language neurological literature. Noting where it has been studied is not a claim that it does anything, and this site makes no claims about benefits or safety. You can compare it with other neuro-research compounds, such as Cerebrolysin, in the peptide library.
How much BAC water for a Cortexin vial?
Cortexin is usually sold in 5 mg and 10 mg vials. Whatever volume of liquid is added, the vial still contains the same milligrams; the volume only changes how concentrated each unit is. The chart below lists micrograms per unit on a U-100 syringe for common combinations.
A Cortexin 10mg vial holds twice the material of a 5 mg vial, so at the same volume every unit carries twice as many micrograms. Doubling the liquid in the larger vial brings it back to the concentration of the smaller vial at the original volume. That symmetry makes a handy sanity check: if two combinations should match and your results differ, recheck the inputs.
| BAC water | 5 mg vial | 10 mg vial |
|---|---|---|
| 1 mL | 50 mcg/unit 5 mg/mL | 100 mcg/unit 10 mg/mL |
| 2 mL | 25 mcg/unit 2.5 mg/mL | 50 mcg/unit 5 mg/mL |
| 3 mL | 16.67 mcg/unit 1.667 mg/mL | 33.33 mcg/unit 3.333 mg/mL |
Each cell shows mcg per unit on a U-100 syringe (100 units = 1 mL) and the resulting concentration.
These volumes are examples, not recommendations. If you want to understand why each row changes the way it does, the BAC water to peptide ratio guide walks through the same logic for other vial sizes.
Worked example: Cortexin 10mg in syringe units
The calculator follows three steps. First, vial mg divided by water mL gives concentration in mg per mL. Second, the amount you enter divided by that concentration gives the volume in mL. Third, mL multiplied by 100 gives units on a U-100 syringe. For example, if the amount you already have is the figure in this sentence and the vial is Cortexin 10mg:
The math: 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL), which is 50 mcg per unit. 1 mg ÷ 5,000 mcg/mL = 0.2 mL = 20 units on a U-100 syringe.
That amount is arbitrary and was chosen because it produces clean numbers. Before you enter your own figure, confirm whether it is written in mg or mcg; 1 mg = 1,000 mcg, and mixing them up shifts the answer a thousandfold. The mg to mcg conversion guide has a quick reference.
Is this a Cortexin dosage calculator?
People sometimes arrive here searching for a Cortexin dosage. This page does not provide one. The calculator is a unit converter: it takes an amount you already have and expresses it as a volume and a mark on a U-100 syringe. It does not choose an amount, a schedule, or a route, and it has no way to judge whether any use is appropriate.
What it does reliably is check arithmetic. If the syringe result is larger than the total volume of liquid in the vial, an input is wrong. If adding more water made the micrograms per unit go up, the vial and water fields are probably swapped. For a full walkthrough of those checks, see how to check peptide calculator math.
Cortexin reconstitution notes from labeling
The Russian pharmaceutical product is a lyophilized powder meant to be dissolved before use, and its own instructions name specific diluents rather than leaving the choice open. Research-labeled vials sold online are a separate product, and some suppliers specify their own diluent and volume. Where a label or supplier sheet names a liquid or a volume, that instruction takes priority over any general page, including this one.
Because Cortexin is a mixture of polypeptides, it is also worth reading the product’s storage conditions carefully before and after mixing. Handling, sterility, and storage should follow the product labeling and a qualified professional. For the difference between common diluents, see bacteriostatic water vs sterile water.
Regulatory status of Cortexin
Cortexin is not approved by the FDA in the United States. Its registration in Russia does not extend to research-labeled vials sold online, which are not the pharmaceutical product. A research label does not establish identity, purity, sterility, or suitability for use in people, and an accurate calculation cannot establish them either.
Because Cortexin is an animal-derived extract rather than a synthetic sequence, two products sold under the same name may differ in source, processing, and content. Read each label on its own terms.
Cortexin FAQ
What is Cortexin made from?
It is a complex of polypeptide fractions extracted from the brain cortex of young farm animals. It is a mixture, not a single peptide sequence.
How much liquid goes in a Cortexin 10mg vial?
There is no single correct volume. The chart shows how different volumes change mcg per unit. If the product label names a diluent or volume, follow the label.
Does this page recommend a Cortexin dosage?
No. It converts an amount you already have into mL and U-100 syringe units and does not suggest an amount, schedule, or use.
Is Cortexin FDA-approved?
No. It is not approved by the FDA in the United States, and research-labeled vials are not the pharmaceutical product marketed in Russia.
Does the calculator work for a 5 mg Cortexin vial?
Yes. Enter 5 mg as the vial size and the volume of liquid you actually added; the same formula applies to any vial size.