Learn how to make semax nasal spray with sterile technique, correct dilutions, and safe storage tips — plus dosage math and a few safety notes.
Making semax nasal spray at home means dissolving lyophilized semax peptide in a sterile diluent and moving that solution into a metered nasal spray bottle. The two numbers that decide everything are the final concentration of the liquid and the volume each pump delivers, because those two figures set the dose in every spray. Semax is a research peptide and is not FDA-approved for human use in the United States, so the information below is educational and not medical advice.
What You Need Before You Start
Clean technique matters more than any brand name. Work on a wiped-down surface, wash your hands, and wear gloves if you have them.
- Lyophilized semax powder in a sealed vial, often sold as 5 mg or 10 mg
- Bacteriostatic water or sterile 0.9% saline as the diluent
- Sterile syringes: 1 mL and 5 mL with needles for drawing and mixing
- Alcohol swabs
- An empty sterile nasal spray bottle with a metered pump, 5–10 mL
- A sharps container and a marker for labeling
If you would rather mix your own diluent than buy it, you can learn how to make bac water — sterile 0.9% sodium chloride with 0.9% benzyl alcohol — although pre-made vials are inexpensive and reliably sterile.
Choosing and Checking the Spray Bottle
Most metered nasal pumps deliver 0.08 to 0.12 mL per press, and 0.1 mL is the most common figure. Do not trust the label: fill the bottle with exactly 2 mL of plain saline, count the sprays until it runs dry, then divide. If you get 20 sprays from 2 mL, your pump delivers 0.1 mL per spray.
Step-by-Step: How to Reconstitute Semax
- Sanitize. Swab the vial stoppers and your work surface with alcohol and let them air dry.
- Draw the diluent. Using a sterile syringe, pull up the volume of bacteriostatic water or saline that matches your target concentration.
- Add it slowly. Insert the needle into the semax vial at an angle and let the liquid run down the inside glass wall instead of blasting onto the powder.
- Swirl, never shake. Roll the vial gently between your fingers until the powder dissolves completely, because shaking can shear the peptide.
- Inspect. The solution should be clear and colorless. If particles remain, keep swirling; if they persist, discard the vial.
- Label. Write the peptide name, the concentration, and the date on the vial.
Once you know how to reconstitute semax, the hardest half of the job is done. Everything after this point is dilution math.
| Vial size | Diluent added | Concentration |
|---|---|---|
| 5 mg | 1 mL | 5 mg/mL |
| 5 mg | 2 mL | 2.5 mg/mL |
| 10 mg | 2 mL | 5 mg/mL |
| 10 mg | 5 mL | 2 mg/mL |
Diluting to Nasal Strength and Dose Per Spray
Nasal research solutions are usually far weaker than the stock you just mixed. A common approach is to dilute a 5 mg/mL stock down to 0.5–2 mg/mL with sterile saline.
Example: mix 1 mL of a 5 mg/mL stock with 4 mL of sterile saline. You now have 5 mL of a 1 mg/mL solution, which equals 1,000 mcg per mL. At 0.1 mL per spray, that is 100 mcg per spray.
| Final concentration | Dose per 0.1 mL spray | How to get there from a 5 mg/mL stock |
|---|---|---|
| 2 mg/mL | 200 mcg | 1 mL stock + 1.5 mL saline |
| 1 mg/mL | 100 mcg | 1 mL stock + 4 mL saline |
| 0.5 mg/mL | 50 mcg | 1 mL stock + 9 mL saline |
Double-check your numbers with one simple rule: concentration in mcg/mL multiplied by spray volume in mL equals the dose per spray. A 1,000 mcg/mL solution times 0.1 mL equals 100 mcg.
Bacteriostatic Water vs. Sterile Saline for Nasal Use
| Factor | Bacteriostatic water | Sterile 0.9% saline |
|---|---|---|
| Preservative | 0.9% benzyl alcohol | None |
| Shelf life after mixing | Up to about 28 days refrigerated | About 1–2 weeks refrigerated |
| Nasal tolerability | Can sting or dry the nasal lining | Gentler on nasal tissue |
| Best used for | Longer storage of the stock vial | The final diluted spray |
Many people reconstitute with bacteriostatic water for stability, then dilute the finished nasal spray with preservative-free saline to reduce irritation.
Safety and Reported Side Effects
Nasal stinging, dryness, and a runny nose are the semax nasal spray side effects most often described, and they usually fade within minutes.
- Nasal burning or a brief runny nose right after spraying
- Headache, lightheadedness, or a short-lived drop in blood pressure
- Irritability or trouble sleeping when doses are high or taken late in the day
- Risk of sinus or skin infection if the bottle, hands, or needle are not sterile
Semax has limited human safety data and is not an FDA-approved drug, so the purity, actual peptide content, and sterility of gray-market vials cannot be verified. Anyone who is pregnant, breastfeeding, taking blood pressure medication, or managing a heart condition should talk to a healthcare professional before using any research peptide. Never share a nasal bottle or a syringe.
How to Store Semax Powder and Mixed Spray
Knowing how to store semax properly is what keeps a batch usable, because degradation is the main reason a homemade spray quietly loses potency.
- Unopened powder: keep it in the freezer at -20°C, protected from light, where it can last for years.
- Reconstituted stock: refrigerate at 2–8°C and use within 2–4 weeks.
- Diluted nasal spray: refrigerate in an amber bottle and use within 1–2 weeks if it contains no preservative.
- Never freeze a mixed solution, and never leave it in a hot car or on a sunny windowsill.
Discard any solution that turns cloudy, changes color, or shows floating particles. Write the mix date on the bottle so you are not guessing later.
The same sterile technique, dilution math, and storage rules carry over across this peptide family, and people researching how to make pt-141 nasal spray follow nearly the identical process.
Common Mistakes to Avoid
- Shaking the vial instead of swirling it, which can damage the peptide.
- Reusing needles or drawing from a stopper that was never swabbed.
- Assuming the pump delivers exactly 0.1 mL without measuring it first.
- Mixing a large batch of diluted spray that will expire before you finish it.
Frequently Asked Questions
Is semax nasal spray FDA-approved in the United States?
No. Semax is a synthetic peptide that is not FDA-approved for human use in the United States, and it is generally sold as a research chemical. That means purity, potency, and sterility are not verified by any regulator, so human use carries unknown risks.
How much semax is in one spray of a homemade nasal spray?
It depends on your final concentration and on how much your pump actually delivers. If you dilute to 1 mg/mL and the pump puts out 0.1 mL per spray, each spray contains roughly 100 mcg of semax. Measure your bottle's real spray volume with saline before you rely on any number.
What is the best liquid to dilute semax nasal spray with?
Sterile 0.9% saline is the gentlest choice for the final nasal solution because it contains no preservatives that can irritate the nasal lining. Bacteriostatic water is helpful for the stock vial since it slows bacterial growth, but its benzyl alcohol can sting. Many people reconstitute with bacteriostatic water and then dilute the spray with sterile saline.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.