SemaxvsThymosin Alpha-1
Semax vs Thymosin Alpha-1 — independent comparison of uses, administration, pricing across providers, and key differences. Last reviewed April 21, 2026.
Quick Verdict
Based on clinical evidence and real patient data
A synthetic peptide derived from adrenocorticotropic hormone (ACTH) fragment 4-10. Developed in Russia for cognitive enhancement and neuroprotection, it modulates BDNF and serotonin levels.
A naturally occurring peptide first isolated from the thymus gland. FDA-orphan-drug designated, it enhances immune function by stimulating T-cell maturation and modulating cytokine production.
Best choice depends on your insurance, budget, and treatment history.Take the quiz to get a personalized recommendation.
Semax vs Thymosin Alpha-1: At a Glance
Full comparison across all key factors.
| Factor | SemaxALLY PICK | Thymosin Alpha-1 |
|---|---|---|
| Category | cognitive | anti-aging |
| Also Known As | ACTH 4-10 Analog | Ta1, Zadaxin |
| Administration | Intranasal spray | Subcutaneous injection |
| Prescription | Required | Required |
| Providers | 4 providers✓ Better | 3 providers |
| Common Uses |
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Data sourced from FDA prescribing information and peer-reviewed clinical trials. Prices reflect telehealth platform costs as of April 21, 2026. See our methodology.
Pricing by Provider
3 providers offer both Semax and Thymosin Alpha-1.
| Provider | Semax | Thymosin Alpha-1 | Consultation | Lab Testing |
|---|---|---|---|---|
 | $120/monthly | $220/monthly | Video Telehealth | Yes |
 | $140/monthly | $240/monthly | Video Telehealth | Yes |
 | $160/monthly | $280/monthly | Video Telehealth | Yes |
 | $45/one-time | Not offered | Async Telehealth | No |
Key Differences
Semax
More ProvidersA synthetic peptide derived from adrenocorticotropic hormone (ACTH) fragment 4-10. Developed in Russia for cognitive enhancement and neuroprotection, it modulates BDNF and serotonin levels.
Thymosin Alpha-1
A naturally occurring peptide first isolated from the thymus gland. FDA-orphan-drug designated, it enhances immune function by stimulating T-cell maturation and modulating cytokine production.
Which Is Right for You?
Choose Semaxif…
- You want a cognitive medication
- You prefer intranasal spray administration
- You want more provider options (4 available)
- Your primary goal is cognitive enhancement
- Your primary goal is neuroprotection
Choose Thymosin Alpha-1if…
- You want a anti-aging medication
- You prefer subcutaneous injection administration
- 3 providers available on our platform
- Your primary goal is immune system support
- Your primary goal is chronic infection management
Frequently Asked Questions
What is the difference between Semax and Thymosin Alpha-1?
Which is cheaper, Semax or Thymosin Alpha-1?
Can I switch from Semax to Thymosin Alpha-1?
Medical Disclaimer
This comparison is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting, stopping, or changing any medication. Individual results may vary. The information presented reflects publicly available data and may not account for your specific health situation.