Livagen: Reference Overview and Reconstitution Notes

Livagen is a lab-made chain of just four protein building blocks, called a tetrapeptide (a very short protein fragment). Its chemical sequence is Lys-Glu-Asp-Ala, often shortened to KEDA. It belongs to the Khavinson class of peptide bioregulators (small molecules studied for their possible effects on tissue behavior). It is sold as a research-only compound and is not FDA-approved.

Livagen

What it is

Livagen is a synthetic short-peptide bioregulator of the Khavinson class. "Synthetic" means it is made in a lab. A "peptide bioregulator" is a short chain of amino acids (the building blocks that link together to form proteins) that researchers study for possible effects on how tissue functions.

Its chemical sequence is Lys-Glu-Asp-Ala (also written as KEDA). Those four letters are short names for four specific amino acids strung together in order.

Research on Khavinson-class compounds is linked to the Saint Petersburg Institute of Bioregulation and Gerontology in Russia. This article covers only what Livagen is, its current status, and how to handle it at the lab bench.

Research context and categorization

Livagen is grouped with the Khavinson bioregulators, a family of small peptides discussed in anti-aging and longevity research. Studies have focused mainly on the liver and on immune-related tissue.

Within that research area, Livagen has been studied in connection with liver tissue. Scientists have looked at whether it interacts with chromatin (the tightly coiled material inside a cell that holds DNA) and gene expression (the process of turning specific genes on or off). Think of chromatin like a very tightly wound ball of yarn. If the yarn is too tightly wound, you cannot pull out any thread to use. Loosening the coil lets the cell "read" more of its own genetic instructions.

Some lab studies reported a loosening of tightly packed DNA in lymphocytes (white blood cells that are part of the immune system) taken from older donors. Other studies reported a switch-on effect for genes that control how cells build proteins. Livagen has also been studied in preclinical (animal and cell-culture) models of liver injury and immune function. All of these uses are still investigational, meaning they are under study and not confirmed.

Key point: Livagen is not FDA-approved. Most of its described effects come from Russian preclinical work with limited independent replication, and none should be read as confirmed or approved benefits.

Status

• Regulatory status: Research-only. Livagen is not FDA-approved and has no approved human or veterinary use. It is characterized largely in preclinical work, with no established human clinical trials. It is supplied as a research chemical, not as a drug, food, cosmetic, or dietary supplement.
• Sport status: Livagen is not listed by name on the WADA Prohibited List (the global list of substances banned in competitive sport). However, WADA can still capture substances by general pharmacological class (the broad category a drug belongs to), and through a catch-all rule for compounds with a similar chemical structure or biological effect. The absence of a specific name on the list does not by itself mean a substance is permitted in competition.

Reconstitution notes (general)

Livagen typically arrives as a lyophilized (freeze-dried) powder. Before lab use, it is mixed with bacteriostatic water (a specially purified water that contains a small preservative to slow bacterial growth). This mixing step is called reconstitution.

The working concentration (how much peptide is in each milliliter of liquid) is simply the milligrams of peptide in the vial divided by the milliliters of water added. For example, a 20 mg vial mixed with 2 mL of water gives 10 mg per mL. The same vial mixed with 3 mL gives about 6.7 mg per mL. To plan your target concentration, use the peptide calculator.

Dilution and handling notes (compound-specific)

Livagen is a very small molecule, a tetrapeptide of only four amino acids. Short peptides of this type dissolve easily in water (they are highly water-soluble). In practice, Livagen goes into solution quickly and cleanly, producing a clear, colorless liquid. It does not gel, cloud, or become stringy the way larger or more water-repelling peptides sometimes do.

The reason it dissolves so easily is that the outer parts of the lysine, glutamic acid, and aspartic acid building blocks carry an electric charge and are attracted to water (a property called hydrophilic, meaning "water-loving"). No heating or vigorous mixing is needed.

Livagen is commonly sold in small vials, often in the 10 mg to 20 mg range. Typical reconstitution volumes are roughly 2 to 3 mL of bacteriostatic water per vial, giving working concentrations of about 6.7 to 10 mg per mL.

The volume you choose depends on the concentration you want, not on how much water is needed to dissolve the powder. A round number like 10 mg per mL is chosen mainly because it is easier to measure accurately, not because the compound requires it.

Step-by-Step Handling Guidelines

When preparing the peptide, keep these handling guidelines in mind:

• Add water slowly: Let the water run gently down the inside wall of the vial instead of squirting it directly onto the powder cake. Forcing the water in hard can cause foaming. Short peptides like this dissolve without any agitation.
• Do not shake: Swirl the vial gently, or simply let it sit for a minute or two. The powder should clear on its own. Shaking creates foam at the air-liquid surface, which makes accurate measurement harder and can stress the peptide.
• Manage temporary cloudiness: If a faint haze appears right after adding water, let the vial rest at room temperature for a short while. The remaining powder should finish dissolving and the liquid should clear. If the solution stays cloudy or turns cloudy later, discard it rather than trying to force it back into solution.
• Protect the solution: Keep the vial away from direct light during handling. Avoid repeated freeze-thaw cycles of the mixed solution, and return it to the refrigerator promptly after use.

Handling and storage

Good storage keeps the compound stable and ready for lab use. Follow these guidelines:

• Store the freeze-dried powder cold, and keep the reconstituted vial refrigerated at 2 to 8 degrees Celsius (roughly 36 to 46 degrees Fahrenheit).
• Keep the vial out of light.
• Wipe the rubber stopper with an alcohol swab before each puncture, and write the mixing date on the vial label.
• Use the reconstituted vial within about four weeks of mixing when stored under refrigeration.
• Discard any vial that becomes cloudy, changes color, or shows floating particles.

Related reading

• LL-37
• Matrixyl
• Melanotan II
• How Reconstitution Works
• How Long Does a Reconstituted Vial Last?

Tools and supplies

• peptide calculator
• Bacteriostatic Water 30 ml
• Gansulin Metal Reusable Pen
• 3 ml Glass Cartridges (10-pack)
• Complete Starter Kit

Reminder: research and educational reference only. Preppin Peppers sells hardware and materials, not peptides. Not medical, dosing, or health advice, not evaluated by the FDA, and not intended for human or animal use.

Frequently asked questions

What is Livagen and what is its chemical sequence?

Livagen is a synthetic tetrapeptide in the Khavinson bioregulator class. Its amino-acid sequence is Lys-Glu-Asp-Ala (KEDA). It is a research-only compound with no FDA approval or established human use.

Is Livagen FDA-approved or permitted for human use?

No. Livagen is a research chemical with no FDA approval and no approved human or veterinary use. Its described effects derive mainly from Russian preclinical studies with limited independent replication.

How is lyophilized Livagen reconstituted for lab use?

Lyophilized Livagen powder is reconstituted by slowly adding bacteriostatic water along the vial wall via a reconstitution pen, then gently swirling until dissolved. Apply sterile technique and follow supplier storage guidelines.

What the research community gets wrong about Livagen handling

Livagen is a short, water-loving tetrapeptide, and that simplicity leads to a few handling habits worth rethinking at the bench.

• Assuming it needs heat or hard mixing. Because it is a four-amino-acid peptide with charged side groups from lysine, glutamic acid, and aspartic acid, Livagen usually goes into water on its own. A gentle swirl or a short rest is enough. Warming the vial or running it on a vortex adds stress it does not need.
• Treating high solubility as if it means high stability. Dissolving fast and staying intact are two different things. A peptide that carries glutamic acid and aspartic acid can still break down slowly once it is in water, so a clear vial is not proof the material is unchanged. Keep the mixed solution cold and dated, and plan short working windows.
• Squirting water straight onto the powder cake. Aiming the stream at the powder can whip up foam at the air and liquid surface, which can strain the peptide and make the volume harder to read. Let the water run down the inside wall of the vial instead.
• Leaving the mixed vial out because it is a small molecule. Being small does not make it immune to light and warmth. Store the reconstituted vial in the refrigerator, keep it out of direct light, and avoid repeated freeze and thaw cycles.

On our bench, Livagen has been one of the easier powders to reconstitute. When we run water slowly down the vial wall and let it sit for a minute, the cake clears to a colorless solution without any swirling or coaxing, and we have not seen it gel or turn stringy the way some larger, water-repelling peptides do. The one thing we stay strict about is keeping the mixed vial cold and out of light, since a peptide this soluble still deserves careful storage rather than being left on the bench between uses.

Sources

1. Bacteriostatic Water for Injection, USP , FDA/DailyMed label (0.9% benzyl alcohol)
2. Duerkop et al., Biotechnol J 2018 , Impact of Cavitation, High Shear Stress and Air/Liquid Interfaces on Protein Aggregation
3. Sigma-Aldrich (Merck) , Handling and Storage Guidelines for Peptides and Proteins
4. PubChem CID 87919683 , Livagen (H-Lys-Glu-Asp-Ala-OH), molecular formula C18H31N5O9 (NIH / National Library of Medicine)
5. Khavinson VKh et al. Effects of Livagen peptide on chromatin activation in lymphocytes from old people. Bull Exp Biol Med. 2002. PMID 12533768
6. Khavinson VKh, Lezhava TA, Malinin VV. Effects of short peptides on lymphocyte chromatin in senile subjects. Bull Exp Biol Med. 2004. PMID 15085253