Most researchers load a spray bottle and start spraying without ever testing what comes out of each pump. Every number they calculate after that is a guess. Here is how to do it so the math is accurate from the start.
Semax, Selank, and Oxytocin are all neuropeptides. Their target is the brain and central nervous system, not a muscle or fat tissue. They do not work like a GLP-1 or a GH secretagogue. The published research on all three overwhelmingly uses intranasal delivery because the nose has direct nerve pathways to the brain that bypass the bloodstream entirely.
This guide covers the math for transferring one vial of Semax, Selank, or Oxytocin into a nasal spray bottle. One compound, one bottle, step by step.
Researchers who have a vial of Semax, Selank, or Oxytocin and want to transfer it into a nasal spray bottle with accurate dosing per spray.
Anyone who has been using these compounds subcutaneously and wants to understand why intranasal is the primary research delivery route and how to set it up correctly.
Step one: test your spray bottle output
Before any math matters you need one number: how many microliters your specific spray bottle delivers per pump. Every spray bottle is different. The pump mechanism, tube length, and reservoir design all affect the output. Do not assume your bottle matches any other bottle. Test it.
Put 5 mL of saline or bacteriostatic water into the empty spray bottle using a syringe. If you are using a larger bottle like a 20 mL, still use 5 mL. Smaller amounts may not be enough liquid to prime the longer tube inside.
Prime the bottle by pumping until you get the first full even mist. Those priming pumps do not count because the tube inside is filling with liquid during that phase. Once you see a full spray, start counting. Spray and count until it stops producing full mist. When it starts sputtering or producing weak uneven output, stop.
Write down the number of full sprays you got. Divide 5,000 by that number. 5,000 because 5 mL equals 5,000 microliters. The result is your microliters per spray. Write it down. Every calculation below uses it.
This is the most important step in the entire process. If you skip this, every number you calculate after it is a guess. Test your bottle once. Write the number down. Use it for everything.
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Run the Protocol Intelligence ToolSemax: 10 mg vial at 450 micrograms per spray
One thing has to be clear before doing any math because this is where the most common mistake happens. Micrograms is the amount of compound. Microliters is the volume of liquid. They sound almost identical but they measure completely different things.
Your Semax vial says 10 mg on the label. 10 milligrams equals 10,000 micrograms because one milligram is one thousand micrograms. That 10,000 does not change no matter how much water you add. Water changes concentration, not the amount of compound in the vial.
Research reference ranges for Semax peptide nasal spray generally fall between 300 and 600 micrograms per administration. 450 micrograms sits in the middle of that range.
Step 1. Divide 10,000 by 450. That gives you 22 sprays from the vial.
Step 2. Multiply 22 by your microliters per spray from the bottle test. That gives you the total microliters of liquid you need.
Step 3. Divide that number by 1,000 to convert it to milliliters. That is how much bacteriostatic water to add to the vial.
Step 4. Add that amount of bacteriostatic water to the Semax vial using the slow drip technique. Tilt the vial at 45 degrees, aim the needle at the glass wall away from the powder, push slowly so the water drips down and absorbs naturally. Gently roll between palms until clear.
Step 5. Draw all of the reconstituted solution from the vial and transfer it into the spray bottle.
Each spray now delivers 450 mcg of Semax. You get 22 sprays from the vial. The bottle will not be full if you are using a larger bottle. That is correct. The bottle size does not matter. The concentration of the liquid inside and the output per pump is what determines your micrograms per spray.
If you want to dilute further, add the same amount of saline again directly to the bottle. Each spray now delivers 225 mcg instead of 450. You get 44 sprays instead of 22. Same total compound, spread across more liquid.
Selank: 10 mg vial at 450 micrograms per spray
The math for Selank is the same as Semax because the vial size is the same and the target per spray is the same. Research reference ranges for Selank nasal spray generally fall between 250 and 500 micrograms per administration. 450 micrograms falls within that range.
Step 1. Divide 10,000 by 450. That gives you 22 sprays from the vial.
Step 2. Multiply 22 by your microliters per spray from the bottle test.
Step 3. Divide that number by 1,000 to convert it to milliliters. That is how much bacteriostatic water to add to the vial.
Step 4. Add that amount of bacteriostatic water to the Selank vial using the slow drip technique.
Step 5. Draw all of the reconstituted solution from the vial and transfer it into the spray bottle.
Each spray delivers 450 mcg of Selank. You get 22 sprays from the vial.
Semax and Selank are almost always paired together in research protocols. Semax handles cognitive drive and BDNF. Selank handles anxiety and cortisol. If you are using both, one spray from each bottle twice daily during daytime hours is the standard research approach.
The free protocol check maps your current compounds to the bottleneck they were built to solve. If the bottleneck has already been addressed, it flags it. Before adding a second compound, knowing which variable is actually limiting the result is the more useful starting point than assuming more is better.
Run the Free Protocol CheckOxytocin: 2 mg vial at 150 micrograms per spray
Oxytocin is a smaller vial than Semax or Selank. It comes as 2 mg which is 2,000 micrograms. Research reference ranges for oxytocin nasal spray generally fall between 100 and 300 micrograms per administration. 150 mcg is the reference dose from the reconstitution guide.
Step 1. Divide 2,000 by 150. That gives you 13 sprays from the vial.
Step 2. Multiply 13 by your microliters per spray from the bottle test.
Step 3. Divide that number by 1,000 to convert it to milliliters. That is how much bacteriostatic water to add to the vial.
Step 4. Add that amount of bacteriostatic water to the Oxytocin vial using the slow drip technique.
Step 5. Draw all of the reconstituted solution from the vial and transfer it into the spray bottle.
Each spray delivers approximately 150 mcg of Oxytocin. You get 13 sprays from the vial. Fewer sprays than Semax or Selank because the vial is smaller.
Storage
Reconstituted peptides should be stored refrigerated at 2 to 8 degrees Celsius. Use within 14 to 28 days of reconstitution. Do not freeze reconstituted peptides. Once the solution is in the spray bottle, keep the bottle refrigerated between uses.
What does Selank do?
Selank is a synthetic analog of tuftsin, a naturally occurring peptide involved in immune signaling. Research suggests it modulates GABA and serotonin pathways to reduce anxiety and stress related cortisol without producing sedation or dependency. In plain terms it calms the mental noise without making you tired. It is studied as a daytime compound, usually twice daily intranasally, and is almost always paired with Semax in cognitive and mood focused research protocols.
Which is better, Semax or Selank?
They are not competing options. They solve different problems. Semax targets BDNF, dopamine, and cognitive drive. If the issue is flat motivation, poor focus, and mental fatigue, that is the Semax side. Selank targets anxiety, racing thoughts, and elevated cortisol. If the issue is stress, mental noise, and feeling wired but unproductive, that is the Selank side. In research protocols they are paired together because both problems often coexist, especially during extended caloric restriction or when a GLP-1 protocol has been running long enough to affect mood and cognition.
Is Selank similar to Xanax?
Both reduce anxiety but through completely different mechanisms. Xanax is a benzodiazepine that suppresses central nervous system activity broadly, producing sedation, dependency risk, and cognitive impairment at higher doses. Selank modulates GABA and serotonin signaling without that broad suppression. Research suggests it produces anxiolytic effects without the sedation, cognitive fog, or dependency profile associated with benzodiazepines. They are not pharmacologically comparable beyond the shared outcome of reduced anxiety.
How long does Selank take to kick in?
Research suggests most users notice reduced anxiety and cortisol driven mental noise within 1 to 3 days of consistent intranasal use. Cognitive and mood improvements from the Semax and Selank combination together typically become noticeable within 3 to 5 days. Selank is not an acute anxiolytic like a benzodiazepine that works within minutes. It modulates signaling pathways over days and the effect builds with consistent use.
Why intranasal instead of subcutaneous?
All three are neuropeptides. Their target is the brain and central nervous system. The inside of the nose has two nerve pathways, the olfactory nerve and the trigeminal nerve, that connect directly to the brain without going through the bloodstream first. When you inject subcutaneously the compound enters the bloodstream and then has to cross the blood brain barrier to reach its target. Research suggests the percentage that makes it across is significantly lower for neuropeptides. Intranasal delivery uses the nose to brain pathways and reduces that bottleneck.
Can I combine two of these compounds in one spray bottle?
Semax and Selank are commonly combined in one nasal spray. Premade combination sprays are already sold by compounding pharmacies. Oxytocin can also be combined with either compound. All three are intranasal neuropeptides with no known stability conflicts when mixed in solution. The math for combining requires adjusting reconstitution volumes so both compounds hit their target concentration in the same total liquid. If you are comfortable with the single vial math in this guide, the combination math follows the same logic with one extra step.
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