Selank and Semax are both synthetic peptides with documented effects on cognitive function and mental health. While they share some similarities, they also have distinct differences in their mechanisms of action, benefits, and administration protocols. This article provides a detailed comparison of these two peptides to help understand their unique characteristics and potential applications [1][18].
| Selank | Semax | |
|---|---|---|
| Drug class | Selank is a synthetic peptide derived from tuftsin and another sequence for stability. | Semax is a fragment of the adrenocorticotropic hormone (ACTH4-10). |
| Mechanism | Selank modulates immune response, enhances memory, and improves cognitive function by elevating BDNF and influencing monoamine neurotransmitters. | Semax works by elevating BDNF and TrkB receptor expression, activating dopaminergic and serotonergic stems, and attenuating chronic stress effects. |
| Primary use | Selank is used to treat anxiety disorders, improve memory, and support cognitive function in conditions like Alzheimer's and MCI. | Semax is used to treat memory and cognitive disorders, support the immune system, and improve neuronal survival under stress. |
| Administration | Adult human dose: 215 mg (1cc) IM/Sub Q daily, 7 days a week, for a 4-week cycle. | Adult human dose: 750–1000 mcg intranasally, 100–300 mcg Sub Q daily. |
| Evidence strength | Selank has research-documented benefits such as enhancing memory, exhibiting antianxiety properties, and modulating cytokines. | Semax has research-documented benefits including counteracting inhibition of learning and memory, inhibiting neurodegeneration, and promoting neuron survival during hypoxia and glutamate neurotoxicity. |
Mechanism of Action
Selank and Semax differ in their mechanisms of action. Selank, derived from tuftsin, is known to modulate immune response, enhance memory, and improve cognitive function by elevating brain-derived neurotrophic factor (BDNF) in the hippocampus and influencing monoamine neurotransmitters [1]. In contrast, Semax, a fragment of adrenocorticotropic hormone (ACTH4-10), exhibits nootropic, psycho-stimulating, antioxidant, and antihypoxic effects. It works by elevating BDNF and the TrkB receptor expression, activating dopaminergic and serotonergic stems, and attenuating chronic stress effects [18].
Primary Uses
Both peptides have applications in cognitive enhancement and mental health. Selank is primarily used to treat anxiety disorders, improve memory, and support cognitive function in conditions like Alzheimer's and mild cognitive impairment (MCI) [1]. Semax, on the other hand, is used to treat memory and cognitive disorders, support the immune system, and improve neuronal survival under stress [18].
Administration Protocols
The administration protocols for Selank and Semax also differ. Selank is typically administered as an adult human dose of 215 mg (1cc) intramuscularly (IM) or subcutaneously (Sub Q) daily, 7 days a week, for a 4-week cycle. It can also be administered as a 215 mg/ml solution for intravenous drip, two times a week for 2 weeks [1]. Semax is administered as an adult human dose of 750–1000 mcg intranasally and 100–300 mcg subcutaneously daily, with a caution against exceeding these maximum dosages to avoid desensitization [18].
Evidence Strength
The evidence supporting the benefits of Selank and Semax varies. Selank has research-documented benefits such as enhancing memory and cognitive function, exhibiting antianxiety, antidepressant, and antiasthenic properties, and modulating Interleukin-6 and T cell cytokines [1]. Semax has research-documented benefits including counteracting inhibition of learning and memory induced by heavy metals, inhibiting neurodegeneration caused by dopamine oxidation, promoting neuron survival during hypoxia and glutamate neurotoxicity, increasing the amount and mobility of immune cells, and enhancing the expression of chemokine and immunoglobulin genes [18].
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