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Someone tried a nasal spray that mixes two research peptides, Semax and Selank, and posted that they’ve been feeling mild itching or prickling on their face and sometimes elsewhere. There’s no visible rash, redness, or hives — just a weird tingling sensation, described as mild and similar to the harmless tingling people sometimes get from beta-alanine (a supplement), but without warmth or strong intensity. Semax and Selank are short lab-made chains of amino acids called peptides. They were developed in Russia as experimental treatments for things like brain function, anxiety, and recovery after injury. They’re not the same as weight-loss drugs like semaglutide/Ozempic. Semax is thought to influence brain signaling related to attention and memory. Selank is thought to have anxiety-reducing effects. Most people who talk about them use them as nasal sprays because that’s a convenient way to get them into the bloodstream and brain, but they’re not widely approved medicines in many countries and are mainly studied in small trials or animal experiments. What this post describes is an anecdote — one person’s experience — not a controlled study. There’s no data here about how often this happens, whether it’s caused by the peptides, the spray’s preservatives, or something else like an allergic reaction. Mild tingling or paresthesia (that “pins and needles” feeling) can happen with a lot of substances, and nasal sprays can also irritate mucous membranes or trigger small nerve responses. Without systematic reporting or a larger group of users, you can’t know if Semax or Selank reliably cause this symptom, or whether this person is unusually sensitive. Why this matters: if you’re curious about trying Semax or Selank, or are already using them, this is the sort of side effect to keep an eye on. Mild tingling without other symptoms isn’t necessarily dangerous, but it’s a signal your body is reacting and worth noting. People prone to allergies, skin sensations, or nerve sensitivities might care the most. Also, if you experience escalating symptoms like swelling, widespread rash, breathing trouble, or persistent discomfort, that changes the situation and needs prompt medical attention. Caveats and risks: this is a single anecdote and doesn’t establish cause-and-effect. Semax and Selank are research peptides with limited testing in large human trials outside of Russia. Quality control of off-label products can vary, so an impurity or preservative in a spray could be the real culprit. People who are pregnant, breastfeeding, on blood thinners, or with significant medical conditions should be cautious and talk to a healthcare provider before using such products. If you get any signs of a true allergic reaction (swelling of face or throat, difficulty breathing) seek emergency care. For minor persistent itching, stop use and consult a clinician. Bottom line: a mild tingling after Semax/Selank nasal use is being reported by at least one user, but it’s anecdotal and unexplained — worth monitoring, but not proven to be a common or dangerous effect.
Source: r/Peptides