Semax

Semax is a synthetic heptapeptide: a laboratory-made chain of exactly seven amino acids, modeled on a short fragment of adrenocorticotropic hormone (ACTH), a naturally occurring hormone. It is manufactured for research use only and, in the United States, is not approved by the FDA for any use.

• Structure: seven amino acids joined in a fixed sequence, which is why it is classified as a heptapeptide.
• Origin: synthesized in a lab to replicate a fragment of ACTH rather than extracted from animal or human tissue.
• Research category: grouped with other ACTH-derived peptide fragments studied in laboratory settings.
• Regulatory status: labeled research use only; the FDA has not approved it as a drug, supplement, or consumer product.

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

This section covers the hardware side of working with Semax research vials and cartridges - not dosing, titration or administration, which this article does not address.

Which cartridges fit the pens?

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.

Do the cartridges work with other pens too?

Our cartridges are engineered and verified against our own pen bodies only. We have not tested them in third-party pens, so we can't confirm fit or function outside our own hardware - check the stopper length above before assuming compatibility. Needles are a separate consideration: our pens accept universal 28G-33G screw-on pen needles.

What it is

Semax is a synthetic heptapeptide, a laboratory-made chain of exactly seven amino acids, the basic building blocks researchers use to construct protein-like molecules. Its sequence is derived from a short fragment of adrenocorticotropic hormone (ACTH), a naturally occurring hormone, modified with an added terminal sequence designed to resist rapid breakdown by peptidases, enzymes that cleave amino acid chains.

This structural change is reported to extend the molecule's stability during in vitro handling and storage relative to the unmodified ACTH fragment. Semax was first synthesized at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is classified within a broader family of ACTH-derived peptide fragments that laboratories study for their activity on the nervous system, distinct from full-length ACTH itself.

Research context and categorization

Semax is classified in the cognitive and neuroprotective (nootropic) research category. "Cognitive" refers to laboratory measures of thinking and memory. "Neuroprotective" refers to research into whether a compound may help shield nerve cells from damage. Studies in this category generally examine signaling activity within the nervous system.

Published research on Semax has looked at:

• Its possible influence on brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF), two proteins associated with the growth and survival of brain cells
• Animal models of cerebral ischemia (reduced blood flow to the brain)
• Cell survival markers in laboratory models
• Attention- and memory-related outcome measures

All of these research areas are investigational: the findings are still being studied and are not established outcomes. Semax has not received approval from the U.S. Food and Drug Administration for any use, and it is not in our catalog: PreppinPeppers sells research hardware (pens, cartridges and bacteriostatic water), not Semax.

Russia and some neighboring countries have separately registered Semax as a prescription drug for conditions including ischemic stroke and cognitive decline. That foreign registration is a regulatory status in those countries only - it does not establish approval or safety anywhere else, including the United States.

Key point: Semax has not been approved by the FDA and remains restricted to research use only in our catalog, even though it holds prescription-drug registration in Russia.

Status

• Regulatory status: In the United States, Semax is sold and studied strictly for research use. It carries no U.S. drug approval and does not appear on any official U.S. drug standards listing. In Russia, it is registered and prescribed as a medication for certain conditions, which does not change its research-only status elsewhere.
• Sport status: Semax is not named on the WADA Prohibited List. As a substance without approval from any government health authority for human therapeutic use, it may still fall under the S0 catch-all category, which covers substances not addressed elsewhere on the list and bans them at all times. Because these lists and interpretations are updated periodically, athletes should confirm the current classification directly with their governing body before making any assumptions.

Reconstitution notes (general)

Semax is typically supplied as a lyophilized (freeze-dried) powder. Reconstitution is the process of dissolving that powder in a liquid diluent immediately before lab use. The most common diluent is bacteriostatic water: sterile water containing a small amount of benzyl alcohol as a preservative to slow microbial growth. We do not sell bacteriostatic water; it is sourced separately from a lab-supply provider.

Once dissolved, concentration is a simple ratio: milligrams of peptide divided by milliliters of diluent added. For example, 5 mg mixed into 5 mL yields 1 mg/mL. Benzyl alcohol can affect a peptide's long-term stability in solution, which is one reason reconstituted material is generally kept refrigerated and used within a limited storage window rather than held indefinitely. Work out any milligram-to-milliliter combination with the peptide calculator.

Dilution and handling notes (compound-specific)

Solubility and Ratios

Semax is a short, highly water-soluble peptide that dissolves readily in aqueous diluents, forming a clear, colorless solution rather than the gelling or cloudiness sometimes seen with larger, more hydrophobic peptides. A commonly referenced range is 1 mL to 5 mL of bacteriostatic water per 5 mg of lyophilized material, giving concentrations from roughly 5 mg/mL down to 1 mg/mL.

A smaller diluent volume gives a more concentrated solution and a smaller total volume to measure; a larger volume spreads the same material across more room on a syringe scale, making small graduations easier to read. The diluent amount is chosen for measuring convenience, not because dissolving is difficult.

Bacteriostatic water is preserved with a small percentage of benzyl alcohol, which inhibits microbial growth in a multi-use vial. Benzyl alcohol is generally well tolerated by short peptides like Semax at bench-preparation concentrations, but it is one more reason to log preparation dates and keep reconstituted vials refrigerated and shielded from light.

Reconstitution Best Practices

Follow these steps when working with short peptides like Semax at the bench:

• Add the diluent slowly down the inside wall of the vial rather than directly onto the powder.
• Swirl gently instead of shaking; a forceful stream or vigorous agitation can cause foaming and clumping.
• If the powder does not dissolve right away, let the vial sit and swirl again gently rather than forcing it.
• Discard any solution that turns cloudy or shows floating particles after proper mixing - this signals a problem, not normal behavior.

Semax is also available as a ready-to-use liquid for laboratory use; this form is already in solution and requires no diluent.

Handling and storage

Store the reconstituted solution in a refrigerator at 2 to 8 degrees Celsius (standard fridge temperature) and keep it away from light. Wipe the rubber stopper with an alcohol swab before drawing from the vial, and label the vial with the date you mixed it.

A reconstituted, refrigerated solution is commonly referenced with an approximate 4-week window. Visible change is the main signal to watch for: discard the vial if the contents turn cloudy, change color, or show floating particles, as these are typical signs a peptide solution has degraded in storage.

Diluent choice can also affect that window - preservative content (for example, benzyl alcohol) and buffer composition may influence how a reconstituted solution holds up over time, so follow your diluent manufacturer's documentation for storage and handling guidance.

Frequently asked questions