# Selank / Semax Blend

> Selank / Semax Blend combines two Russian-developed synthetic peptides that are each individually studied for effects on the central nervous system: Selank, a heptapeptide analog of tuftsin researched for anxiolytic and immunomodulatory activity, and Semax, a heptapeptide fragment of ACTH studied for neurotrophic and cognitive-supportive effects. The two are combined into one injectable product on the premise that Selank's influence on GABAergic and serotonergic signaling may complement Semax's support of BDNF and NGF expression, appealing to users interested in both calm and mental clarity. No dedicated clinical trials have evaluated this specific combination; available evidence comes entirely from research on each peptide individually. It is not approved for human medical use in most jurisdictions and is generally reserved for laboratory or self-directed research contexts.

- URL: https://www.lifeconverted.com/peptides/selank-semax-blend
- Also known as: Selank-Semax Stack, SS Cognitive Blend
- Primary category: Cognitive Blends
- Effectiveness rank: #14 in Cognitive & Neuro; #1 in Cognitive Blends
- Evidence level: Emerging research
- Route: Subcutaneous (Sold as a single combined subcutaneous injectable. Each parent peptide is also studied individually via intranasal administration, but that route is not typically used for this premixed blend.)
- Dose range: 150-600 mcg
- Dose tiers: low 150 mcg; moderate 300 mcg; high 600 mcg
- Half-life: Both parent peptides clear from circulation quickly, with reported half-lives under 30 minutes; subjective and neurotrophic effects are described as outlasting this window.
- Timing: Morning
- Cycle: 2-3 weeks on, 1-2 weeks off (Modeled on cycling patterns described for each parent peptide individually. Combination-specific cycling data do not exist.)
- Storage: Store lyophilized powder refrigerated (2-8°C) away from light. After reconstitution, keep refrigerated and use within the supplier's stated window, typically 2-4 weeks.

## Mechanism of action

Selank is proposed to modulate GABAergic and serotonergic neurotransmission and to slow the breakdown of endogenous enkephalins, alongside reported effects on brain-derived neurotrophic factor (BDNF) expression. Semax is studied for increasing expression of BDNF and nerve growth factor (NGF), supporting neuronal plasticity, and for modulating dopaminergic and serotonergic activity. Combining the two is intended to pair Selank's anxiolytic-leaning profile with Semax's neurotrophic and attention-related effects, though no study has directly examined whether the two act synergistically, additively, or independently when co-administered.

## Reported benefits

- Studied components are individually associated with reduced anxiety-like behavior (Selank) and support for memory and attention (Semax)
- Delivered as a single combined injection rather than two separate peptides
- May appeal to users interested in simultaneous calming and cognitive-support effects
- Both parent peptides remain under continued individual investigation for neurotrophic and immunomodulatory activity

## Reported side effects

- Injection site redness or irritation
- Headache
- Changes in appetite
- Irritability or overstimulation at higher combined doses
- Effects specific to the combination itself have not been formally studied

## Common protocols

- Once-daily morning subcutaneous dose for daytime use
- Split AM/PM dosing to extend perceived duration
- Short research cycles of 2-3 weeks with a rest period before repeating

## Stacking notes

Sometimes discussed alongside other nootropic peptides in informal protocols. No controlled data describe interaction effects, and the combination itself has not been formally studied.

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Educational information only, not medical advice. Full disclaimer: https://www.lifeconverted.com/disclaimer