How to Reconstitute Selank: A Friendly Step-by-Step Guide

What Is Reconstitution — and Why Does It Matter?

Peptides like Selank are shipped as a delicate freeze-dried powder. That powder needs to be dissolved in a liquid before it can be used. That process is called reconstitution. Getting it right protects the peptide's structure and keeps your measurements accurate.

Selank is a synthetic analog of tuftsin, a naturally occurring peptide. Researchers have studied it for its effects on stress markers, cytokine levels, and brain chemistry.^[3] Its neuroactive properties have also drawn interest in broader peptide research contexts.^[2] Handling it carefully during reconstitution helps preserve those properties for research use.

What You'll Need

• Your Selank vial (freeze-dried powder)
• Bacteriostatic water (BAC water) — this contains a small amount of benzyl alcohol that keeps bacteria from growing
• An insulin syringe (1 mL)
• Alcohol swabs
• A clean, flat surface

Step 1: Warm the Vial

Take your Selank vial out of the fridge or freezer and let it sit at room temperature for 10–15 minutes. A cold vial can cause the liquid to clump or the peptide to degrade unevenly. Just set it on the counter — no heating required. Room temperature is perfect.

Step 2: Wipe Everything Down

Use a fresh alcohol swab to clean the rubber stopper on your Selank vial and the stopper on your BAC water vial. This simple step keeps contaminants out. Let the alcohol dry for about 30 seconds before you proceed.

Step 3: Draw Your BAC Water

Insert your insulin syringe into the BAC water vial and draw up the amount of liquid you need. How much? That depends on your target concentration — which is exactly where the calculator comes in handy (more on that in Step 5). A common starting point is 1–2 mL of BAC water per vial, but your needs may vary.

Step 4: Add the Water Slowly — This Is the Key Step

This is where most people go wrong. Do not squirt the water directly onto the powder. Instead, angle your needle so the BAC water runs slowly down the inside wall of the vial. Let it trickle down gently. This prevents foaming and protects the peptide from mechanical damage caused by a forceful stream.

Add the water in small increments if possible. Patience here pays off.

Step 5: Swirl — Never Shake

Once the water is in, you'll see the powder begin to dissolve. Swirl the vial slowly between your fingers in a gentle circular motion. The solution should turn clear within a minute or two. If it doesn't, give it another minute — don't rush it.

Never shake the vial. Shaking creates air bubbles and can break down the peptide chain. Gentle swirling is all you need.

Step 6: Use the Calculator to Measure Your Dose

Now that your Selank is reconstituted, you need to know how many units on your syringe equal a specific dose in micrograms. This math trips people up, but it doesn't have to. Head to our calculator, enter the amount of BAC water you used and the total peptide amount in your vial, and it will tell you exactly how many units to draw.

For example, if you dissolved a 5 mg vial in 2 mL of BAC water, your concentration is 2,500 mcg per mL — or 25 mcg per unit on a 100-unit insulin syringe. The calculator handles all of this for you automatically.

Research studies have used Selank in a range of doses to examine effects on stress-related cytokine levels^[3], liver morphology under chronic stress^[4], memory markers involving BDNF^[6], and functional brain connectivity.^[5] Dosing in animal models has varied considerably, which is another reason precise measurement matters in research settings.^[1]

Step 7: Store It Correctly

Once reconstituted, Selank should be stored in the refrigerator at 2–8°C (36–46°F). Keep it away from light. Most researchers use reconstituted peptides within 4 weeks. Always label your vial with the date you reconstituted it so you don't lose track.

Do not freeze a reconstituted vial — freezing can cause the solution to degrade. The original lyophilized (freeze-dried) powder, however, can be stored frozen until you're ready to use it.

You've Got This

Reconstituting Selank is a skill that feels unfamiliar the first time and second-nature by the third. Warm the vial, swirl don't shake, add water along the wall, and let the calculator do the math. That's really all there is to it.

Sources

1. Selank, a Peptide Analog of Tuftsin, Attenuates Aversive Signs of Morphine Withdrawal in Rats. — Bulletin of experimental biology and medicine, 2022. PMID 36322304.
2. Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions. — Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews, 2026. PMID 41490200.
3. The Influence of Selank on the Level of Cytokines Under the Conditions of "Social" Stress. — Current reviews in clinical and experimental pharmacology, 2021. PMID 32621722.
4. Effect of Selank on Morphological Parameters of Rat Liver in Chronic Foot-Shock Stress. — Bulletin of experimental biology and medicine, 2019. PMID 31243679.
5. Functional Connectomic Approach to Studying Selank and Semax Effects. — Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections, 2020. PMID 32342318.
6. Selank, Peptide Analogue of Tuftsin, Protects Against Ethanol-Induced Memory Impairment by Regulating of BDNF Content in the Hippocampus and Prefrontal Cortex in Rats. — Bulletin of experimental biology and medicine, 2019. PMID 31625062.