Calculators

Semax calculators

Reconstitution, dose, mg ↔ units, and vial duration — pre-filled with a 5 mg / 2 mL Semax example. Switch tabs to run each one.

Concentration

2.50 mg/mL

Draw (units)

16.0

Draw (mL)

0.160

Doses / vial

12

How the Semax reconstitution calculator works

A 5 mg Semax vial mixed with 2 mL of bacteriostatic water gives 2.5 mg/mL. A 400 mcg dose pulls 0.16 mL or 16 units. The vial covers 12 doses — about 2 weeks at daily cadence, fitting a typical short cognitive cycle.

One Semax-specific failure mode worth knowing before you use the reconstitution math: Forgetting to log subjective effects, making it hard to evaluate the protocol's success. What does the 'NA' in some Semax products mean? You might see products labeled as 'N-Acetyl Semax' or 'N-Acetyl Semax Amidate.' These are modified versions of the original Semax peptide. The 'N-Acetyl' and 'Amidate' chemical groups are added to increase the peptide's stability and improve its ability to cross the blood-brain barrier. Many users report that these modified forms are more potent, meaning a smaller dose might be required to achieve similar effects.

Vial size, diluent volume, and dose are the three inputs that genuinely change the answer. Doses-per-vial is a derived output — it's the vial mg divided by the dose mg, rounded down. The most common edge case is a tiny dose: at very high concentration, a 0.1 mL draw is only a few units on the syringe, which is hard to read accurately. If your unit count drops below five, consider reconstituting the next vial with more BAC water so each dose covers a larger volume.

Reconstituting Semax is the first hands-on step in preparing it for a research protocol. The peptide arrives as a delicate, white lyophilized powder at the bottom of a sealed vial. The goal is to carefully mix this powder with a sterile liquid, usually bacteriostatic (BAC) water, to create a solution for injection. This process requires a clean environment and careful handling to maintain the sterility and integrity of the peptide. You will need your Semax vial, a vial of BAC water, alcohol prep pads, and a larger syringe for transferring the water. It’s important to let the water gently run down the side of the Semax vial rather than spraying it directly onto the powder, as this helps prevent potential damage to the delicate peptide molecules. Once the water is added, gently swirl or roll the vial between your hands; never shake it vigorously.

Let's walk through a specific example based on the common vial size and dose you’ll be tracking. Imagine you have a vial with 5 mg of Semax powder and you plan to add 2 mL of BAC water. First, you calculate the final concentration of your solution: 5 mg of peptide divided by 2 mL of liquid equals 2.5 mg per mL. Now, let's say your target dose for today's research log is 0.4 mg. To figure out how much liquid to draw, you divide your target dose by the concentration: 0.4 mg divided by 2.5 mg/mL gives you 0.16 mL. Since standard U-100 insulin syringes measure in units, where 100 units equal 1 mL, your injection volume is 16 Units. Knowing this conversion is key to accurate dosing and is exactly what the Peptide Pilot app helps you calculate seamlessly.

After you have carefully mixed your Semax, proper labeling and storage are your next critical steps. Use a piece of tape or a marker to label the vial with the peptide name, the concentration (e.g., "2.5 mg/mL"), and the date it was reconstituted. This simple step prevents mix-ups if you are working with multiple peptides and helps you track the solution's age. The mixed vial must then be stored in the refrigerator to preserve its potency. The process of reconstitution might seem intimidating at first, but after doing it once or twice, it becomes a straightforward and quick routine. Taking your time, staying organized, and double-checking your math are the keys to a successful and accurate preparation for your research.

Worked example

A worked Semax reconstitution, step by step

  1. Start with the vial: 5 mg of Semax sitting in dry powder.
  2. Inject 2 mL of bacteriostatic water down the inside wall — don't shoot it straight at the powder.
  3. Concentration locks in at 5 ÷ 2 = 2.50 mg/mL for the entire life of the vial.
  4. A 0.4 mg dose becomes 0.160 mL of liquid, which reads as 16 units on a U-100 syringe.
  5. That vial has 12 clean draws in it before a partial dose at the bottom forces a new vial.

Semax-specific note: Reconstituting Semax is the first hands-on step in preparing it for a research protocol.

Semax BAC water choices for this vial

The same 5 mg Semax vial mixed with three different bacteriostatic water volumes. Doses-per-vial stays constant; the syringe unit count changes.

BAC water (mL)Concentration (mg/mL)Units for 0.4 mg dose
15.008
22.5016
31.6724

Lower BAC water volume concentrates the Semax solution and shrinks the unit count per dose. Higher volume spreads the dose into a more readable unit range.

Scenarios people actually run into

Three things that come up logging Semax

  • Forgetting to log subjective effects, making it hard to evaluate the protocol's success.
  • Powder didn't fully dissolve after the swirl. Wait the full five minutes before assuming anything is wrong; Semax is slower to dissolve than the cleanest GLP-1s, and shaking the vial is the most common way to wreck a fresh reconstitution.
  • Fresh 5 mg vial, no time to look things up. 2 mL of bacteriostatic water down the inside wall, swirl for a minute, write the date on the cap, done — concentration is now 2.50 mg/mL for the next 2-ish weeks.

Same-category neighbor

Semax next to Selank

Both sit in the Cognitive bucket — here's the reconstitution math side by side on each one's example vial.

SemaxSelank
Vial5 mg5 mg
BAC water2 mL2 mL
Concentration2.50 mg/mL2.50 mg/mL

Want the full breakdown? Selank reference →

Reconstitution notes for Semax

Reconstituting Semax is the first hands-on step in preparing it for a research protocol. The peptide arrives as a delicate, white lyophilized powder at the bottom of a sealed vial. The goal is to carefully mix this powder with a sterile liquid, usually bacteriostatic (BAC) water, to create a solution for injection. This process requires a clean environment and careful handling to maintain the sterility and integrity of the peptide. You will need your Semax vial, a vial of BAC water, alcohol prep pads, and a larger syringe for transferring the water. It’s important to let the water gently run down the side of the Semax vial rather than spraying it directly onto the powder, as this helps prevent potential damage to the delicate peptide molecules. Once the water is added, gently swirl or roll the vial between your hands; never shake it vigorously.

Let's walk through a specific example based on the common vial size and dose you’ll be tracking. Imagine you have a vial with 5 mg of Semax powder and you plan to add 2 mL of BAC water. First, you calculate the final concentration of your solution: 5 mg of peptide divided by 2 mL of liquid equals 2.5 mg per mL. Now, let's say your target dose for today's research log is 0.4 mg. To figure out how much liquid to draw, you divide your target dose by the concentration: 0.4 mg divided by 2.5 mg/mL gives you 0.16 mL. Since standard U-100 insulin syringes measure in units, where 100 units equal 1 mL, your injection volume is 16 Units. Knowing this conversion is key to accurate dosing and is exactly what the Peptide Pilot app helps you calculate seamlessly.

After you have carefully mixed your Semax, proper labeling and storage are your next critical steps. Use a piece of tape or a marker to label the vial with the peptide name, the concentration (e.g., "2.5 mg/mL"), and the date it was reconstituted. This simple step prevents mix-ups if you are working with multiple peptides and helps you track the solution's age. The mixed vial must then be stored in the refrigerator to preserve its potency. The process of reconstitution might seem intimidating at first, but after doing it once or twice, it becomes a straightforward and quick routine. Taking your time, staying organized, and double-checking your math are the keys to a successful and accurate preparation for your research.

Common Semax reconstitution mistakes

  • Storing the reconstituted vial at room temperature instead of in the refrigerator.
  • Shaking the vial vigorously during reconstitution, which can damage the peptide.
  • Inaccurate reconstitution math, leading to consistently incorrect doses.

Frequently asked questions about Semax reconstitution

How much bacteriostatic water should I use for a Semax vial?
There's no single right answer — the diluent volume is the variable you control. With this 5 mg Semax vial, 2 mL is a common starting point because it produces 2.50 mg/mL, which usually puts a typical dose in a comfortable 10–30 unit range on a U-100 syringe. More water = cleaner unit counts but slightly fewer doses per vial. Less water = more doses per vial but harder-to-read syringe markings. Semax intranasal use is common — sub-Q dose tables don't directly translate to spray-bottle volumes.
What's the difference between bacteriostatic water and sterile water?
Bacteriostatic (BAC) water contains 0.9 % benzyl alcohol as a preservative, which keeps the reconstituted vial usable for several weeks. Sterile water has no preservative — it's intended for single use, after which the vial should be discarded. For Semax vials that get drawn from multiple times, BAC water is the standard choice. Semax intranasal use is common — sub-Q dose tables don't directly translate to spray-bottle volumes.
Can I shake the Semax vial after adding water?
Don't shake it — peptides are protein-like molecules and aggressive agitation can break them. After injecting BAC water down the inner wall of the vial, swirl gently or invert the vial a few times. It should clear within a minute or two. Cloudy solution after 5 minutes of gentle swirling is a sign the powder is degraded. Semax intranasal use is common — sub-Q dose tables don't directly translate to spray-bottle volumes.
How long does a reconstituted Semax vial stay usable?
Most lyophilized peptides reconstituted with BAC water are typically used within 4–6 weeks of refrigerated storage. The peptide itself starts to lose potency over time, and the BAC water's preservative window has limits. Writing the reconstitution date on the vial is the easiest guard against using one past that window. Semax intranasal use is common — sub-Q dose tables don't directly translate to spray-bottle volumes.

Semax reference numbers

Derived from the example vial used to pre-fill the calculators below.

Vial
5 mg
mixed with 2 mL BAC water
Concentration
2.5 mg/mL
2500 mcg/mL
Example dose
0.4 mg
≈ 16 units on U-100
Doses per vial
12
at 0.4 mg
Weeks per vial
1.7
at 7× / week

These are calculators, not a Semax explainer — the reference page at /peptides/semax covers what Semax is, how it's studied, and how people log it. Use the tabs above to run the math: reconstitution converts a vial into a concentration, dose tells you how many U-100 units a target mg dose draws, mg ↔ units flips between the two readings, and vial duration projects how long the 5 mg Semax vial lasts at 7 doses per week. Change any input and every tab recomputes.

Related on Peptide Pilot

Track Semax doses in the app

Peptide Pilot stores your vial once and derives every subsequent dose, draw, and refill reminder from those numbers automatically.

Download on the App StoreiPhone · Free · No credit card