Overview
Thymalin is classified as a healing peptide in Milligram's compound library. Dipeptide (Lys-Glu) derived from thymic extract.
With a half-life of ~24 minutes, Thymalin requires daily administration in most observed protocols. Administered via IM and SubQ injection, it has a bioavailability of approximately 80% via its primary route.
Half-life approximately 15–30 minutes. Low molecular weight enables rapid absorption from injection site. One-compartment model.
Mechanism of Action
Thymalin's pharmacological activity involves the following key pathways:
Tissue Repair Signaling
Thymalin interacts with cellular repair pathways. Its mechanism involves modulation of growth factors and signaling cascades relevant to tissue recovery.
Systemic Distribution
After subcutaneous administration, Thymalin enters systemic circulation and distributes to target tissues where it exerts its pharmacological effects.
Dosing Protocols
The following protocols represent commonly observed dosing patterns. These are observational summaries, not recommendations.
Dose
5 mg/day
Route
Intramuscular
Frequency
2-3 times daily
Duration
4-12 weeks
Dose
10 mg/day
Route
Intramuscular
Frequency
2-3 times daily
Duration
4-12 weeks
Reconstitution Steps
Thymalin is supplied as a lyophilized (freeze-dried) powder and requires reconstitution before use. Common vial sizes: 10 mg, 20 mg.
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1
Gather Supplies
Collect the Thymalin lyophilized vial, bacteriostatic water or sterile saline, alcohol swabs, a mixing syringe, and injection syringes for dosing.
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2
Swab Vial Tops
Clean the rubber stoppers on both the Thymalin vial and diluent vial with alcohol swabs. Allow to air dry for 10 seconds.
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3
Add Diluent
For a 10 mg vial, slowly inject 1 mL of bacteriostatic water along the inner wall. This yields 10 mg/mL. For a 20 mg vial, use 2 mL for the same 10 mg/mL concentration.
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4
Gently Mix
Swirl the vial gently until the powder is completely dissolved. Thymalin typically dissolves readily. Do not shake vigorously.
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5
Withdraw Your Dose
For a 10 mg dose from a 10 mg/mL solution, draw the full 1 mL (100 units on an insulin syringe). A standard insulin syringe may be used for SubQ, while a 25–27 gauge needle is typical for IM administration.
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6
Store Properly
Refrigerate the reconstituted vial at 2–8°C. Given the short 5–10 day course duration, a single reconstituted vial is typically used within the treatment period.
Quick Reconstitution Math
10 mg vial + 1 mL bac water = 10 mg/mL. For a 10 mg dose, draw 100 units (1 mL). For a 5 mg dose, draw 50 units (0.5 mL) on a 100-unit insulin syringe. Use the Milligram reconstitution calculator for custom vial sizes.
Stable for up to 2 weeks refrigerated at 2–8°C after reconstitution. Lyophilized powder is stable at room temperature for up to 3 years sealed, or 5+ years refrigerated. Protect from light and moisture.
Frequently Asked Questions
What is Thymalin and how does it work?
Thymalin is a polypeptide bioregulator derived from the thymus gland, originally developed at the St. Petersburg Institute of Bioregulation and Gerontology in Russia by Professor Vladimir Khavinson. It contains short peptides (including KE, EW, and EDP sequences) that modulate gene expression associated with T-cell differentiation, immune protein synthesis, and cellular repair. Thymalin works by restoring thymic function that naturally declines with age due to thymic involution.
What is the half-life of Thymalin?
Thymalin has an estimated circulating half-life of approximately 30 minutes, consistent with its low-molecular-weight polypeptide composition. Despite this short plasma half-life, its bioregulatory effects on gene expression and immune cell differentiation persist well beyond clearance. This is why Thymalin is typically administered in short, concentrated courses rather than continuous daily use.
How is Thymalin typically dosed and cycled?
The standard Khavinson clinical protocol involves 10 mg daily via intramuscular or subcutaneous injection for 5–10 consecutive days, totaling 50–100 mg per course. This short course is typically repeated every 6 months. The cyclical dosing pattern is based on the bioregulatory model – the short peptide sequences are believed to initiate gene expression changes that persist for months after the administration period.
How long does Thymalin take to show effects?
Immune function improvements have been observed within 1–2 weeks of completing a course in clinical studies. Measurable changes in T-cell counts and immune markers are typically documented within 2–4 weeks after the treatment course. The full extent of immune restoration and longevity-related effects are generally assessed over multiple courses spanning 6–12 months.
What does the clinical research on Thymalin show?
A landmark study by Khavinson and Morozov observed a 2.0–2.1-fold decrease in mortality among Thymalin-treated patients over a multi-year follow-up period. When combined with Epithalon (a pineal peptide bioregulator), the mortality reduction reached approximately 4.1-fold. Thymalin has also been studied in the context of respiratory infections, where a single 10-day course administered before cold and flu season was associated with a 2.0–2.4-fold reduction in infection rates.
What are the common side effects of Thymalin?
Thymalin is known for an excellent tolerability profile across decades of clinical use, including in elderly populations. Side effects are rarely reported and are generally limited to mild injection site discomfort. No significant adverse effects have been documented in the published Russian clinical literature, even with repeated courses over extended periods.