Semax Dosage Guide: Nasal and Injection Protocols
Semax is a short peptide developed in Russia and used there clinically, which means its dosing is better documented than most research nootropics but almost entirely outside the FDA framework. This guide covers the standard nootropic doses, the intranasal and subcutaneous routes, reconstitution math for a nasal sprayer, timing, cycling, and how it pairs with Selank. For the background pharmacology, start with the Semax peptide overview.
Semax Dosage Chart: Quick Reference
The doses below reflect the common nootropic range. Russian clinical protocols for stroke and other indications use higher amounts under supervision, but for cognitive use the 300 to 600 mcg daily band is where nearly everyone lands.
| Protocol | Dose | Route | Frequency | Best For |
|---|---|---|---|---|
| Beginner | 300 mcg | Intranasal | Once, morning | First-time users |
| Standard nootropic | 600 mcg | Intranasal | 300 mcg, twice daily | Focus, memory work |
| Subcutaneous | 200–400 mcg | Injection | Once or twice daily | Predictable delivery |
The Standard Nootropic Dose
For cognitive use, the reference point is 300 mcg per nostril taken in the morning, giving roughly 600 mcg on the day if you dose both sides, or 300 mcg if you do one application. A sensible way to begin is a single 300 mcg dose for the first week to see how you respond, then adding a second dose only if the first is well tolerated and you want more. Effects on alertness are usually noticeable within half an hour, which makes self-titration straightforward.
Intranasal Protocol and Reconstitution
Semax is sold as a lyophilized powder, and the nasal route is the most common. Reconstitute a 10 mg vial with about 2 mL of bacteriostatic water to get a 5 mg/mL solution. At that strength a 0.1 mL spray carries roughly 500 mcg, which is on the high side of a single dose, so many users either dilute further with more bacteriostatic water or use a metered dropper to hit closer to 300 mcg per application. Swirl to mix, do not shake, and refrigerate. The storage rules in our peptide storage guide apply.
Subcutaneous Dosing
Injection is the alternative to the nasal spray and gives more consistent delivery, since nasal absorption swings with congestion, spray technique, and how much solution drains. Subcutaneous doses sit in a similar 200 to 400 mcg range per administration. The injection mechanics are the same as any small-volume subcutaneous peptide; the technique in how to inject BPC-157 carries over. Most people stay nasal for convenience and only switch to injection when they want reproducible dosing.
Timing
Dose in the morning. Semax is stimulating for most users and taking it late can interfere with sleep. A single morning dose suits most cognitive goals because the downstream neurotrophic effects are thought to outlast the peptide in the blood. If you use a second dose, keep it before mid-afternoon.
Cycling
A common pattern is 10 to 14 days on followed by a break, which tracks much of the clinical dosing literature. Others run continuous 4 to 8 week stretches for a specific project or study period. Tolerance does not appear to be a strong issue, so cycling is used mostly to reassess whether the effect is still meaningful compared with baseline rather than to restore sensitivity.
Stacking with Selank
The Semax and Selank pairing is the classic nootropic stack. Semax pushes alertness and focus while Selank leans calming and anti-anxiety, so they offset each other well; people run them together in the morning or split Semax to the morning and Selank later. Our Semax vs Selank comparison breaks down where each one fits.
Side Effects and Safety
Semax is generally reported as well tolerated at nootropic doses. The usual complaints are mild nasal irritation from the spray, occasional headache, and overstimulation or disrupted sleep when dosed too late. It is not FDA-approved, and human safety data outside decades of Russian clinical use is limited, so keeping to the low end of the dose range is the reasonable default rather than pushing amounts up.
Frequently Asked Questions About Semax
The most common research dose is 300 mcg per nostril once in the morning, roughly 600 mcg total per day. Many users run a single 300 mcg dose to start and add a second dose later in the day only if needed. Doses in published Russian clinical use span a wide range depending on the indication, but 300 to 600 mcg daily is the typical nootropic range.
Reconstitute a 10 mg vial with about 2 mL of bacteriostatic water to make a 5 mg/mL solution, then load a fine-mist nasal sprayer. At that concentration a 0.1 mL spray delivers roughly 500 mcg, so many users dilute further or use a metered sprayer to land near 300 mcg per application. One spray per nostril in the morning is the standard pattern.
Once or twice daily. The downstream BDNF and NGF effects Semax is associated with are thought to persist well beyond the peptide clearing the blood, so once-daily morning dosing is enough for most people. A second dose is usually placed early afternoon rather than evening, because Semax tends to increase alertness.
Morning. Semax is stimulating for most users, with reported effects on alertness and focus appearing within 15 to 30 minutes. Taking it late in the day risks interfering with sleep. If you use a second dose, keep it before mid-afternoon.
Yes, subcutaneous dosing is used, typically in a similar 200 to 400 mcg range per dose. Injection gives more predictable delivery than the nasal route, where absorption varies with congestion and technique. Most casual users stay with the nasal spray for convenience and reserve injection for when consistency matters.
Common cycles run 10 to 14 days on, which mirrors much of the clinical dosing literature, followed by a break. Some users run longer continuous stretches of 4 to 8 weeks for cognitive goals. There is no strong evidence of tolerance, but cycling is used partly to reassess whether the effect is still present against baseline.
Yes, and it is one of the most common pairings. Semax leans stimulating and focus-oriented while Selank leans calming and anti-anxiety, so people run them together or on alternating schedules. See our Semax vs Selank comparison for how the two differ and how they are combined.
Semax is generally reported as well tolerated. The most common complaints are mild nasal irritation from the spray, occasional headache, and overstimulation or trouble sleeping if dosed late. Because it is not FDA-approved and long-term human safety data outside Russian use is thin, conservative dosing is sensible.