Calculator

Selank reconstitution calculator

Pre-filled with an illustrative 5 mg vial and 2 mL of bacteriostatic water. Tweak any input — the math updates instantly.

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Concentration

2.50 mg/mL

Draw (units)

12.0

Draw (mL)

0.120

Doses / vial

16

Selank is a peptide that people explore for its potential effects on anxiety and brain function, often talked about in nootropic circles. It is a synthetic version of a natural peptide found in the spleen called tuftsin, but with a more stable structure that allows it to last longer in the body. Early-stage studies have reported its influence on the balance of certain brain chemicals and proteins involved in nerve growth, which may be linked to mood, learning, and stress resilience. This page covers what the research says about Selank, common ways people track it, and how to use the app’s calculators to stay organized. The calculator above is pre-filled so you can see how the math plays out for a typical Selank vial.

What Selank is

Selank first emerged from the Institute of Molecular Genetics of the Russian Academy of Sciences, where it was developed alongside a similar peptide, Semax. It is legally available in some countries as a nasal spray, but in North America and much of Europe, it exists in a research-only space. People who use it are often looking for support with anxiety, mood regulation, or a cognitive edge without the jittery feelings that can come from stimulants. Because it’s related to tuftsin, a substance that plays a role in the immune system, Selank is also studied for its potential immune-modulating effects. Unlike many other substances used for anxiety, studies report that it doesn’t typically cause drowsiness or interfere with coordination, which is a key reason for its popularity among those seeking mental clarity and calm simultaneously.

The peptide itself is a chain of seven amino acids with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. This structure is a modified version of the natural human peptide tuftsin. The modification helps protect it from being broken down quickly by enzymes in the body, which gives it a longer window of activity. This enhanced stability is crucial for its observed effects. Users in online communities discuss using Selank for a variety of purposes, from managing the stress of a demanding job to supporting focus during intense study sessions. The conversation often revolves around its subtle, non-dramatic action, with many reporting a gradual reduction in background anxiety rather than an immediate, overwhelming sense of calm. This makes its effects something that users often track carefully over time to notice the changes.

In the research market where individuals might acquire Selank for their own tracking, it most commonly appears as a lyophilized (freeze-dried) powder in vials. The most typical vial sizes are 5 mg and 10 mg. This powder form is stable for long-term storage but must be reconstituted with bacteriostatic water before it can be used. Once mixed, it has a much shorter shelf life and must be stored in the refrigerator. The most common method of administration discussed is intranasal, using a nasal spray bottle, though some users also track subcutaneous injections. The choice of method often depends on the desired speed of onset and the specific effects being targeted, with nasal administration thought to have a more direct path to the brain.

The dosing cadence for Selank is often discussed in terms of cycles. A common protocol involves using the peptide daily for a period of 10 to 14 days, followed by a break. This cyclical approach is thought to maintain its effectiveness and prevent the body from becoming too accustomed to it. Doses can vary widely, but many people start low, around 0.25 mg to 0.5 mg per day, to gauge their individual response. Because its effects are often described as cumulative, consistent tracking is key. Users typically log their dose, administration time, and subjective feelings about their mood, focus, and anxiety levels. This detailed logging, often done in an app like Peptide Pilot, helps people build a personal map of how Selank interacts with their system over the course of a cycle.

How Selank is studied

The way Selank works is complex and involves several different pathways in the brain. One of its primary proposed mechanisms is its ability to influence the balance of key neurotransmitters, which are the chemical messengers that brain cells use to communicate. Specifically, Selank is thought to modulate the GABAergic system. GABA (gamma-aminobutyric acid) is the main calming or "inhibitory" neurotransmitter in the brain. By positively influencing GABA receptors, Selank may help to reduce the "excitatory" chatter that contributes to feelings of anxiety and restlessness. This is different from many traditional anti-anxiety medications that directly bind to GABA receptors, which can lead to sedation and dependence. Selank’s action is thought to be more of a gentle nudge, helping the brain’s own calming systems work more effectively.

Another key part of Selank’s mechanism involves its interaction with powerful brain chemicals called monoamines, including dopamine and serotonin. Serotonin is famously linked to mood, happiness, and well-being, while dopamine is central to motivation, focus, and pleasure. Research suggests that Selank can help regulate the breakdown and reuptake of these neurotransmitters, particularly in brain regions associated with emotion and cognition. By helping to maintain a healthier balance of serotonin and dopamine, Selank may contribute to a more stable mood and improved cognitive function. This effect is not like a flood of chemicals; instead, it’s a modulatory effect that helps the brain’s natural rhythms function more optimally, especially under conditions of stress.

Beyond neurotransmitters, Selank is also reported to influence the expression of important neurotrophic factors, specifically Brain-Derived Neurotrophic Factor (BDNF). BDNF is like a fertilizer for the brain; it plays a critical role in the survival of existing neurons and encourages the growth and differentiation of new neurons and synapses. Higher levels of BDNF are associated with improved learning, better memory, and a lower risk of neurodegenerative diseases. By increasing BDNF levels, particularly in the hippocampus (a brain area vital for memory), Selank may support the brain's ability to adapt, learn, and heal. This neuroplastic effect could be one of the reasons why users report not just reduced anxiety, but also enhanced mental clarity and memory recall over the course of a usage cycle.

Finally, Selank’s origin as a tuftsin analog hints at another layer of its mechanism: the immune system. Tuftsin is a natural peptide that helps activate specific immune cells. Selank retains some of these immunomodulatory properties. Its activity is thought to involve influencing the production of cytokines, which are signaling proteins that regulate inflammation and immune responses. In the brain, certain inflammatory cytokines can contribute to feelings of anxiety and depression. By promoting a more balanced, less inflammatory cytokine profile, Selank may exert some of its mood-stabilizing and anxiolytic effects through a pathway that bridges the central nervous system and the immune system.

How people log Selank

People who track Selank use often follow specific protocols to organize their usage and observe its effects systematically. A widely discussed approach is cyclical use. This typically involves a defined "on" period, where the peptide is administered daily, followed by an "off" period. A common starting cycle might be for 10 to 14 consecutive days of use, followed by a break of one to three weeks. This pattern is thought to maximize the peptide's observed effects while minimizing the body's potential to build a tolerance to it. During the "on" cycle, consistency is key, with users often taking their dose at around the same time each day to maintain stable levels in their system. The goal of this structured approach is to allow the peptide’s cumulative effects on neurotransmitters and neurotrophic factors to build up.

When starting a Selank protocol, many experienced users suggest a titration or "ramping up" phase. Instead of starting with a full target dose, they might begin with a smaller dose, such as 0.15 mg or 0.25 mg per day, for the first few days. This allows them to assess their personal response and sensitivity to the peptide. Based on their logged experience—tracking metrics like anxiety levels, mental focus, and any side effects—they might gradually increase the dose every few days until they reach their desired level, which commonly falls in the 0.3 mg to 1 mg per day range for many. This careful, methodical approach helps in finding the "sweet spot" where the desired effects are present without any unwanted reactions. Peptide Pilot is an ideal tool for this, as it allows for precise dose logging and note-taking on subjective responses.

The method of administration is a major component of any Selank protocol. The most common method is intranasal, using an atomizing spray bottle. This route is popular because it’s non-invasive and is thought to deliver the peptide more directly to the brain, bypassing the digestive system and first-pass metabolism in the liver. Users meticulously prepare a nasal spray by reconstituting the lyophilized Selank powder with bacteriostatic water and then transferring the solution to a spray bottle. They calculate the dose per spray based on the total volume and peptide concentration. Alternatively, some users opt for subcutaneous injection, which provides a different absorption profile. The choice between these methods often depends on personal preference and the specific outcomes being tracked, with some users reporting different nuances in the effects from each route.

Regardless of the specific dose or administration method, a successful protocol is heavily reliant on consistent tracking. Beyond just logging the dose amount and time, users often keep a detailed journal of subjective experiences. This can include rating anxiety on a 1-10 scale, noting changes in sleep quality, documenting shifts in mood, or recording how easily they can focus on complex tasks. By tagging entries with these qualitative data points in Peptide Pilot, users can look back at their cycle and see correlations between their Selank use and their mental state. This information becomes invaluable for adjusting future cycles, deciding on dose changes, or determining the optimal length for their "on" and "off" periods.

Reconstitution notes for Selank

Reconstituting Selank powder correctly is the first and most critical step to ensuring accurate tracking. You will need your vial of lyophilized Selank, a vial of bacteriostatic water (often called "bac water"), and sterile syringes for mixing. Before you begin, carefully clean the tops of both vials with an alcohol swab. Let’s walk through a common example. If you have a 5 mg vial of Selank, you might choose to add 2 mL of bac water. After cleaning the vial tops, you would use a syringe to draw exactly 2 mL of bac water. Slowly and gently inject the water into the Selank vial, aiming the stream of water against the side of the glass rather than directly onto the powder to avoid damaging the peptide molecules. Don’t shake the vial; instead, gently swirl it or roll it between your hands until the powder is fully dissolved and the solution is clear.

Once your Selank is reconstituted, the next step is to understand its concentration so you can draw the correct dose. Using our example of a 5 mg vial mixed with 2 mL of diluent, the final concentration of your solution is 2.5 mg per mL (5 mg of peptide ÷ 2 mL of water). This is the key number you’ll use for all your dosing calculations. So, if your target dose is 0.3 mg, you need to figure out what volume of the liquid contains that amount of peptide. You can do this with some simple math: divide your desired dose by the concentration. In this case, 0.3 mg ÷ 2.5 mg/mL = 0.12 mL. This means you would need to draw 0.12 mL of the solution to get a 0.3 mg dose. For subcutaneous use, you’d use an insulin syringe. For nasal use, you would transfer this to a calibrated spray bottle.

It is also very common for peptide users to measure their doses in "units" as marked on an insulin syringe, which can be easier than trying to eyeball fractions of a milliliter. A standard 1 mL insulin syringe is marked with 100 units. If you’ve added 2 mL of water to your vial, that’s equivalent to 200 units of total volume. With 5 mg of Selank in that 200-unit volume, each unit on the syringe contains 0.025 mg of Selank (5 mg ÷ 200 units). To calculate your 0.3 mg dose in units, you would divide the desired dose by the amount of peptide per unit: 0.3 mg ÷ 0.025 mg/unit = 12 units. So, you would draw the solution to the 12-unit mark on the syringe. Using units can feel more precise and is the standard way most people log their doses in apps like Peptide Pilot.

Storage and shelf life

Proper storage of Selank is essential to maintain its potency and integrity. Before reconstitution, the lyophilized (freeze-dried) powder is relatively stable. For long-term storage, it should be kept in a freezer, ideally below -20°C (-4°F). This can preserve its quality for a year or longer. For shorter-term storage, keeping the unopened vial in a refrigerator (between 2°C and 8°C or 36°F and 46°F) is also acceptable, where it should remain stable for several months. It

s crucial to protect the powder from light and heat, so always keep the vial in its box or a dark container. Exposure to room temperature for brief periods, such as during shipping, is generally not a major issue, but prolonged exposure should be avoided. The key is to keep it cold and dark until you are ready to mix it.

Tracking Selank in an app

Tracking your Selank journey in Peptide Pilot helps you stay organized and see the patterns in how you respond. Start by creating a new entry for your 5 mg vial of Selank in the "My Peptides" section. When you reconstitute it with 2 mL of diluent, you can input these numbers into the app. Peptide Pilot will automatically calculate the concentration for you, so you don’t have to do the math manually every time. This becomes the foundation for all your tracking. Each day, when you take your dose, you simply log it. For instance, if you’re taking 0.3 mg, the app can help you measure that as 12 units on your syringe. You can record the time, the amount, and even the administration method—whether it was a nasal spray or a subcutaneous injection. This creates a clean, simple record of your usage over time.

The real power of tracking comes from adding subjective notes to each dose entry. Selank’s effects are often subtle and cumulative, making a journal feature invaluable. After you log your 0.3 mg dose, use the app’s tagging or notes feature to record how you feel. Are you feeling calmer than usual? Is your focus sharper at work? Is your mood more stable? You could create tags like #focus, #calm, or #anxietydown. You can also rate your anxiety or mood on a numerical scale each day. Over a 14-day cycle, you can then scroll back through your log and see a clear story. You might notice, for example, that your self-reported anxiety scores started consistently dropping around day four or that your focus was best in the hours immediately following your dose. This data is purely for your personal insight.

Peptide Pilot also helps manage your protocol schedule. You can set up reminders for your daily dose so you don’t forget, which is crucial for maintaining the consistent levels needed for Selank’s effects to build. The app can also help you track your cycle length. If you’re following a "14 days on, 21 days off" protocol, you can easily see when you started and when it’s time to take a break. It also keeps track of how much peptide is left in your vial, so you know when you’re running low. By offloading all the calculations and record-keeping to the app, you can focus more on observing your personal experience and less on managing the logistics of your peptide tracking.

Background

How peptide reconstitution works in general

The math above is specific to Selank, but the underlying formulas apply to every lyophilized peptide. The reference below covers the units, the trade-offs, and the sanity checks that keep the calculator honest.

What peptide reconstitution actually is

Most research peptides ship as a freeze-dried — also called lyophilized — powder sealed inside a small glass vial. The powder itself cannot be drawn into a syringe and cannot be measured by volume. Before any of that is possible, the powder has to be rehydrated by adding a precise amount of liquid. That step is reconstitution, and it is the foundation of every other calculation that follows.

The liquid added during reconstitution is almost always bacteriostatic water, often shortened to BAC water. It is sterile water that contains a very small amount of benzyl alcohol — usually 0.9 percent. The benzyl alcohol limits microbial growth inside a multi-use vial after the rubber stopper has been pierced for the first time, which is what makes BAC water different from plain sterile water for injection.

Once the powder dissolves into the BAC water, the contents of the vial become a solution with a measurable concentration. That concentration is what links the original mass on the vial label to the volume your syringe will eventually pull. Without a known concentration, every other number on a peptide page is just a guess.

The math behind every reconstitution calculator

Every reconstitution calculator on the internet — including this one — runs the same two-line equation. The first line solves for concentration. The second line solves for the volume you need to draw to hit a specific dose. The third number, units on a U-100 insulin syringe, is just that volume rescaled.

Concentration in milligrams per millilitre equals the milligrams of peptide originally in the vial divided by the millilitres of bacteriostatic water that you added. If you put 5 mg of peptide into 2 mL of BAC water, the concentration is 2.5 mg per mL. That single number now determines how every dose will be measured for the entire life of the vial.

Volume to draw in millilitres equals your desired dose in milligrams divided by that concentration. If your dose is 0.25 mg and the concentration is 2.5 mg per mL, you draw 0.1 mL. On a U-100 insulin syringe, 1 mL is 100 units, so 0.1 mL is 10 units. The calculator shows all three numbers — concentration, volume, units — at the same time so you do not have to convert manually.

There is also a fourth output: doses per vial. That is just the total milligrams in the vial divided by the milligrams in a single dose, rounded down to a whole number because a partial final dose at the bottom of a vial is rarely usable. Tracking doses per vial is what lets a logging app warn you when a vial is running low and a refill needs to be ordered.

Why bacteriostatic water volume is a real choice, not a constant

A vial label only ever tells you how much peptide is inside. It almost never tells you how much BAC water to add — because that part is up to you. Two people can take the same 5 mg vial and reconstitute it with completely different volumes of water, ending up with completely different concentrations, and both can be entirely consistent with how peptides are typically prepared.

Adding more BAC water makes each draw a larger volume in millilitres, which translates to more units on an insulin syringe. That can be useful when typical doses are very small — drawing 4 units is much easier to read accurately on a syringe than drawing 0.4 units, especially when the syringe markings are densely spaced. People often add more diluent on purpose for low-dose peptides for exactly this reason.

Adding less BAC water concentrates the solution. The same dose now occupies a smaller volume, which means fewer units on the syringe and more total doses per vial before refilling. The tradeoff is precision: at very small unit counts, a one-unit error becomes a much larger percentage error in the actual dose delivered. Picking a sensible diluent volume is a real decision that the calculator helps you simulate quickly without committing to a vial.

How insulin syringes turn millilitres into units

Almost every peptide draw is measured on an insulin syringe rather than a tuberculin syringe, because the unit markings make small volumes much easier to read. A standard U-100 insulin syringe is calibrated so that 100 units of fluid fills exactly 1 millilitre. That single relationship — 100 units equals 1 mL — is the only conversion you ever need to memorize.

From there, the math is just multiplication. A 0.5 mL draw is 50 units. A 0.1 mL draw is 10 units. A 0.05 mL draw is 5 units. The reconstitution calculator outputs both volume and units side by side so you can pick whichever number is easier to read on the syringe in your hand.

U-40 insulin syringes also exist, mostly in veterinary contexts, and use a different calibration: 40 units equals 1 mL. Mixing up a U-40 and a U-100 syringe will lead to a dose that is off by a factor of 2.5. The calculator on this page assumes U-100, which is what nearly every peptide user is actually using.

What the calculator does not do

The calculator solves the math. It does not pick a dose for you, it does not pick a frequency, it does not adjust for body weight or sensitivity, and it does not know anything about your specific situation. Those decisions belong to you and a licensed healthcare professional who can look at your bloodwork, your history, and your goals together.

It also does not validate the peptide itself. The calculator assumes the vial actually contains the milligrams printed on the label and that the peptide is properly reconstituted into a clear, fully dissolved solution. If a vial arrives clumped, cloudy, or visibly off, no amount of math fixes that. Reconstitution math only works on a vial that is in good condition to begin with.

Finally, the calculator does not log anything. Every input you type lives only on this page until you reload. The reason Peptide Pilot exists is to stop you from running these numbers from scratch every single dose: enter a vial once, and every subsequent draw, dose, and refill reminder is calculated and logged automatically.

Common Selank mistakes to avoid

  • Using tap water or sterile water instead of bacteriostatic water for reconstitution.
  • Shaking the vial vigorously after adding water, which can damage the peptide.
  • Assuming its effects will be as immediate or intense as a stimulant.
  • Inconsistent dosing, such as skipping days during an "on" cycle.
  • Storing the mixed solution at room temperature instead of in the refrigerator.
  • Eyeballing doses instead of using a properly marked syringe for measurement.
  • Not tracking subjective effects and expecting to remember subtle changes in mood or focus.
  • Starting with too high a dose instead of titrating up from a smaller amount.
  • Forgetting to take a planned break or cycle off after a period of use.

Frequently asked questions about Selank

What is the difference between Selank and Semax?
Selank and Semax were developed by the same Russian institution and are both peptide-based nasal sprays, but they are used for different primary purposes. Selank is generally explored for its anti-anxiety (anxiolytic) effects, while Semax is more known for its cognitive-enhancing (nootropic) and neuroprotective qualities. While there's some overlap, people typically turn to Selank for calm and mood support, and to Semax for focus, memory, and stimulation.
Why is Selank usually administered as a nasal spray?
The intranasal route is common for Selank because it allows the peptide to be absorbed through the nasal mucosa and gain rapid access to the brain. This method bypasses the digestive system, where the peptide would be broken down, and avoids the first-pass metabolism in the liver. This is thought to lead to higher bioavailability in the brain compared to oral ingestion.
Are there different versions of Selank?
Yes, you might see terms like 'N-Acetyl Selank' or 'N-Acetyl Selank Amidate'. These are modified versions of the original Selank peptide. The 'N-Acetyl' and 'Amidate' chemical groups are added to the peptide structure to increase its stability and may alter its absorption and how it works in thebody. Users exploring these versions often report differences in potency and effect duration.
How long does a vial of Selank last?
This depends entirely on the vial size and your daily dose. For example, a 5 mg vial, if used at a dose of 0.3 mg per day, would provide approximately 16 doses (5 mg / 0.3 mg). If you are on a 14-day cycle, one vial would be more than enough for the full cycle. You can use the Vial Duration Calculator in the app to get a precise estimate based on your specific numbers.
Do people use Selank with other nootropics?
In online forums and communities, some people discuss combining Selank with other substances that are used for cognitive or mood support, a practice known as 'stacking'. Because Selank's mechanism is not sedative, it is sometimes paired with other nootropics. However, the interactions between different peptides and substances are not well-studied, and individuals track their progress carefully when using any combination.
What do studies report about Selank for anxiety?
Several early-stage human studies, primarily conducted in Russia, have explored Selank's role in anxiety. These studies have reported that Selank may help reduce symptoms of Generalized Anxiety Disorder (GAD) and other stress-related conditions. The reported effects are often described as stabilizing mood without causing sedation or cognitive impairment, which is a common side effect of many traditional anxiolytics. However, large-scale, international clinical trials are limited.
Is Selank stimulating or sedating?
Most user reports and clinical studies describe Selank as non-sedating. Its primary use is to reduce anxiety and stabilize mood without causing drowsiness, which is one of its distinguishing characteristics. It is also not typically described as a stimulant; instead of providing an energy boost, it is reported to enhance mental clarity and focus by reducing the distraction of anxiety.
How quickly are the effects of Selank noticed?
The observed effects of Selank can vary among individuals. Some people report feeling a subtle sense of calm and improved focus within the first few days of use. For others, the effects are more cumulative and are only noticed after a week or more of consistent daily administration as levels build up in the system. Tracking mood and anxiety levels daily is a good way to observe these gradual changes.

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