Thymosin Alpha-1 vs Selank
Side-by-side comparison of key properties, dosing, and research.
Immune SupportAnti-Aging & Longevity
Thymosin Alpha-1Cognitive Enhancement
Selank- Summary
- Thymosin Alpha-1 is a naturally occurring 28-amino acid peptide derived from the thymus gland. It is a powerful immune modulator approved in many countries for treating chronic hepatitis B, hepatitis C, and as an adjunct in cancer immunotherapy.
- Selank is a synthetic heptapeptide analog of tuftsin developed in Russia. It is a potent anxiolytic that reduces anxiety and enhances cognitive function without sedation or addiction. It is approved for clinical use in Russia for anxiety disorders.
- Half-Life
- 2–3 hours
- Minutes (but effects persist for hours)
- Admin Route
- SubQ
- SubQ, Intranasal
- Research
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- Typical Dose
- 0.8–1.6 mg
- 250–500 mcg
- Frequency
- Twice weekly
- 1–3 times daily
- Key Benefits
- Enhances T-cell and NK cell activity
- Supports recovery from viral and bacterial infections
- May reduce inflammation systemically
- Supports healthy aging and immune resilience
- Improves vaccine response
- Supports liver health
- May help with chronic fatigue syndrome and post-viral conditions
- Approved in multiple countries for hepatitis B and C treatment
- Reduces anxiety without sedation
- Enhances memory and learning
- Improves focus and concentration
- Stabilizes mood
- Reduces physiological stress response
- May enhance motivation
- No addiction potential or withdrawal
- Fast-acting — effects within 20–30 minutes
- Approved clinically in Russia for anxiety disorders
- Side Effects
- Injection site irritation
- Mild flu-like symptoms initially (immune activation)
- Fatigue (rare)
- Mild sedation at higher doses (paradoxical)
- Fatigue (rare)
- Irritability during discontinuation (uncommon)
- Stacks With
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