Semax / Selank

Overview

Semax / Selank is a two-neuropeptide stack built around focus, cognitive stress response, and anxiety-oriented support. Semax supplies the ACTH-fragment cognitive and neuroprotective rationale, while Selank supplies the tuftsin-analog anxiolytic and stress-resilience rationale. [1][3][4]

The pairing is common in nootropic peptide discussions, but the exact Semax plus Selank combination does not have controlled human outcome evidence. Treat the stack as component logic, not a validated cognitive protocol. [2][5][6]

Peptides in this stack

Why They're Combined

Semax is usually positioned as the focus, stress-response, and neurotrophic side of the stack. Selank is usually positioned as the anxiety, stress-resilience, and anxiolytic side. [1][2][3][4]

The stack is used because cognitive drive and anxiety control often pull in opposite directions. The practical idea is to support alertness and task focus while keeping stress reactivity in view, rather than turning the plan into a stimulant-heavy routine. [2][5]

How They Work Together

The proposed complement is neurotrophic and stress-response signaling from Semax plus anxiolytic and immune-neuropeptide signaling from Selank. Both are neuroactive peptides, but they are not interchangeable and should not be treated as two versions of the same effect. [1][4]

In practical terms, the stack is discussed for days when the goal is focus without excess overstimulation. That use case remains extrapolated from separate component literature and user practice rather than combination trials. [2][3][6]

What the Evidence Shows

Selank has older human clinical literature in anxiety-related conditions and review-level molecular discussion. Semax has a larger animal and mechanistic literature for neuroactive and stress-response effects, with weaker accessible human outcome support. [3][4][1][2]

No controlled human trial establishes the Semax / Selank stack for ADHD, anxiety, depression, productivity, memory, or brain injury recovery. Combination confidence should stay below the individual component claims, especially for productivity-style outcomes. [5][6]

Typical Protocol

Common intranasal Semax schedules use 300-600 mcg per day, often split across one or two daytime sprays. Common intranasal Selank schedules use 250-400 mcg per day, often split across one or two sessions. [1][3][4]

The cleanest stack schedule keeps Semax earlier in the day for focus-oriented use and places Selank later or around stress-heavy windows. Many practical plans use 2-4 week blocks, then reassess sleep, anxiety, focus, irritability, headache patterns, and stimulant intake. [2][5][6]

Important Considerations

Semax and Selank have separate neuroactive rationales, but the combination is not established by Western-style randomized trials. Product form, spray strength, and source quality also matter because intranasal peptides are easy to mis-dose. [2][4]

Neuroactive stacks are easy to over-adjust. Caffeine, stimulants, racetams, sleep debt, anxiety medications, dopaminergic or serotonergic drugs, and GABAergic medications can all blur the signal. Track sleep, irritability, headache, anxiety, and focus together; a stack that improves drive while worsening sleep can still fail as a sustainable protocol. [3][6]

Published research 6 sources