By Chloe Nefdt, Registered Professional Nurse (SANC). Updated 22 April 2026.
Short answer: Semax and Selank are both Russian-developed nootropic nasal sprays that share a peaceful, clear-headed quality, but they pull in different directions. Semax is the "focus and drive" option, boosting cognitive performance, memory and mental energy. Selank is the "calm and steady" option, reducing anxiety and improving stress resilience without sedation. Neither is addictive. Many Cape Town clients start with Selank for anxiety, then layer in Semax for demanding workdays.
Semax vs Selank at a Glance
| Attribute | Semax | Selank |
|---|---|---|
| Primary effect | Focus, memory, mental energy | Anxiety relief, mood balance, calm focus |
| Mechanism | ACTH fragment analogue; modulates dopamine, serotonin and BDNF | Tuftsin analogue; modulates GABA and serotonin pathways |
| Feeling profile | Clear, driven, productive, stimulated without jitter | Grounded, unhurried, socially relaxed |
| Format (IVgo) | Nasal spray | Nasal spray |
| Price | R1,100 | R1,100 |
| Typical dose | 2 to 4 sprays morning, up to twice daily | 2 to 4 sprays morning and early afternoon |
| Onset | 15 to 30 minutes | 20 to 45 minutes |
| Duration per dose | 4 to 6 hours | 4 to 6 hours |
| Best day-to-day use case | Deep work, exam prep, presentations, creative sprints | High-stress weeks, social anxiety, sleep hygiene reset |
| Risk of tolerance | Low, but cycle 5 days on 2 off | Low, suitable for 2 to 4 week protocols |
| Sedating | No, slightly activating | No, calming without drowsiness |
| Stacks with caffeine | Yes, reduces jittery edge | Yes, takes the edge off caffeine anxiety |
How to Choose
Choose Semax if:
- You need sustained focus for knowledge work, coding or study
- You are recovering from burnout and need gentle cognitive support
- You want a morning nootropic without stimulant side effects
- You are running a memory-heavy project (exams, launches, public speaking prep)
Choose Selank if:
- You have situational or generalised anxiety that is blocking performance
- You want a calmer feeling without the cognitive dulling of benzodiazepines
- You are navigating a high-stress period and need better stress recovery
- You want to improve social ease without sedation
Can You Use Both?
Yes. A common IVgo protocol is Selank in the morning on high-anxiety weeks, with Semax added on days that require sustained focus. They do not compete for the same receptor systems, which is why the combination feels complementary rather than stacked. Start with one for 2 to 3 weeks so you can attribute effects accurately before layering.
What the Research Actually Says
Semax has been studied in Russian clinical protocols for post-stroke cognitive recovery and ischaemic conditions, with evidence for neuroprotective effects via BDNF upregulation (Skvortsova et al., 2007). Selank has demonstrated anxiolytic activity comparable to benzodiazepines in some trials, without the sedation or dependency profile (Zozulya et al., 2008). Both peptides remain investigational outside Russia, which is why IVgo dispenses them only through a registered South African compounding pharmacy under doctor consultation.
"Clients who benefit most from Selank are the ones who say they cannot switch off. They sleep badly because their head is racing. Semax is for the opposite, the client who sits down to work and cannot pull focus together. We often end up with both on the protocol within a month," says Chloe Nefdt, IVgo founder and SANC-registered Professional Nurse.
Side Effects and Safety
Both peptides are generally well tolerated via nasal administration. Occasional reports include:
- Semax: Mild headache on initial dosing, transient nasal tingling, vivid dreams
- Selank: Mild fatigue at higher doses, rare dizziness, nasal irritation
Neither peptide is associated with addiction, withdrawal or cognitive blunting. Always disclose current medications at consultation, especially SSRIs, SNRIs or benzodiazepines.
Who Should Not Use Semax or Selank
- Pregnant or breastfeeding clients
- Active mania or unstable bipolar disorder
- Known hypersensitivity to peptide compounds
- Undisclosed psychiatric medication stacks without doctor coordination
Frequently Asked Questions
Are Semax and Selank legal in South Africa?
Yes. Both are legally dispensed through registered South African compounding pharmacies with doctor consultation. IVgo does not sell them outside this workflow.
Can I take Selank instead of anti-anxiety medication?
Selank is not a replacement for prescribed psychiatric medication. Never stop or swap psychiatric meds without coordinating with your prescribing doctor. Selank can complement a broader anxiety plan under medical supervision.
Will Semax keep me awake at night?
Rarely. Semax has a 4 to 6 hour window. A morning dose typically clears well before bedtime. Avoid late-afternoon dosing if you are sleep sensitive.
How long until I feel a difference?
Single doses produce a noticeable shift within 30 minutes. Full protocol effects (mood, sleep, stress tolerance) usually become clear at 2 to 4 weeks of consistent use.
Do I need a prescription?
Yes. IVgo requires doctor consultation before dispensing either peptide.
How do prices compare?
Both Semax and Selank are priced at R1,100 per nasal spray at IVgo. See the full pricing page.
Book a Nootropic Consultation
Not sure which nasal spray fits your week? Start with a consultation. Browse Semax Nasal Spray, Selank Nasal Spray, or view the full peptide collection.