Ask VialBase
immune

Thymalin

FDA: not-FDA-approved

Thymalin is a thymus bioregulator peptide complex that restores thymus function, supports immune cell education, and modulates immune overactivation. One of the oldest peptide bioregulators with a strong safety record, it is commonly prescribed to elderly patients for immune revitalization and appears in nearly all cancer support and immune stacks. Clinical data on thymic and pineal peptide bioregulators report increased survival in elderly patients (PMID: 14523363). Restores thymus function and supports immune cell education. Targets thymus output and lymphocyte maturation. Modulates immune overactivation and neuroinflammatory markers. Rebuilds immune-endocrine stability and circadian rhythm. Supports T3/T4 conversion and immune-circadian coordination. Improves epigenetic

This content is for educational and research purposes only. VialBase does not provide medical advice. Consult a healthcare professional before using any peptide.

Molecular weight —
Half-life —
CAS number 63958-90-7
Route —

28-day resets featuring Thymalin

02

Sourcing

Current prices

Updated today

20mg

Only vendor stocking this size on the VialBase roster.

25mg

Only vendor stocking this size on the VialBase roster.

Stocks this compound Third-party tested Public COAs Positive rep
Stocks this compound Third-party tested Public COAs

Save 15% with code vialbase15 at checkout

Stocks this compound Third-party tested Public COAs

VialBase may earn a commission on purchases through partner links — never at additional cost to you. Full disclosure.

Also vetted at
What bloodwork do I need?

Reference ranges are general guidelines. Consult your physician for interpretation.

PRE-CYCLE
  • CMP
  • CBC with differential
  • CRP
DURING CYCLE
  • CBC with differential
POST-CYCLE
  • CMP
  • CBC with differential
Safety & Regulatory Status
FDA STATUS not-FDA-approved

Regulatory status for Thymalin may change. Verify current status with your jurisdiction before use. This is not legal or medical advice.

Frequently Asked Questions

What is Thymalin?
Thymalin is a thymus bioregulator peptide complex that restores thymus function, supports immune cell education, and modulates immune overactivation.
How does Thymalin work?
Restores thymus function and supports immune cell education. Targets thymus output and lymphocyte maturation. Modulates immune overactivation and neuroinflammatory markers.
How is Thymalin dosed?
Standard: 10 mg/day for 5-10 days (most common cycle); Maintenance: 10 mg/day for 5 days/month; monthly pulse dosing; Low-dose: 1 mg 2-3x/week; Route: SubQ injection; Cycling: Short 10-20 day cycles; repeat quarterly or seasonally. These figures reflect commonly cited research protocols, not medical advice — consult a clinician.
Is Thymalin FDA-approved?
Thymalin is not FDA-approved. Not FDA-approved in the United States; Widely used in Russia and Eastern Europe with decades of clinical history; Available through international pharmacies and research suppliers; Part of the Khavinson peptide bioregulator family.