Do I need to take zinc with thymulin?

Thymulin requires zinc to be biologically active. If you are zinc-deficient, thymulin supplementation may be less effective. Ensure adequate zinc intake (15–30 mg daily) alongside thymulin use.

Is thymulin the same as thymosin alpha-1?

No. Both are thymus-derived peptides but are different molecules with distinct mechanisms. Thymosin alpha-1 is better characterised and more widely available. Thymulin is the zinc-dependent nonapeptide that declines with thymic involution.

Immune Support

Thymulin

Thymulin (Facteur Thymique Sérique)

The thymus peptide that declines with immune aging

Thymulin is a nonapeptide hormone produced by the thymus gland, essential for T-cell maturation and immune regulation. Levels decline dramatically with thymic involution.

💉

Admin routes

Subcutaneous

🔬

Popularity

Niche

✅

Side effects

Generally mild

🏪

AU vendors

0 rated

✓Key benefits

1Promotes T-cell maturation and immune competence

2Addresses age-related immune decline (immunosenescence)

3Enhances NK cell activity

4Modulates inflammatory cytokine balance

5Zinc-dependent - highlights zinc's immune importance

6Studied for autoimmune disease modulation

📈What to expect

Week 1–2

Immune system activation begins

Week 2–4

Enhanced T-cell maturation and NK cell activity

Week 4–8

Improved immune markers; reduced infection susceptibility

Week 8–12

Full immune restoration benefits; consider cycling

Based on community reports and published research. Individual results vary significantly.

💊Dosing protocols

Immune support

Dose

50–100 mcg

Frequency

Once daily

Duration

4–8 week cycles

Immune restoration

Dose

100 mcg

Frequency

Once daily

Duration

8–12 weeks

Dosing information is sourced from published research and community protocols. This is not a recommendation. Consult a healthcare professional.

Research status|Clinical data available - studied since the 1970s

Overview

Thymulin (also known as FTS - Facteur Thymique Sérique) is a nine-amino-acid peptide hormone produced by thymic epithelial cells. It requires zinc as a cofactor and is essential for T-cell differentiation, maturation, and immune regulation. Thymulin levels decline sharply after puberty as the thymus involutes (shrinks), contributing to the age-related decline in immune function known as immunosenescence.

⚙️How it works

Binds to specific receptors on T-cell precursors, promoting their maturation into functional T-cells (CD4+ and CD8+). Modulates cytokine production, enhances NK cell activity, and regulates the balance between pro- and anti-inflammatory immune responses. Requires zinc to adopt its biologically active conformation - without zinc, thymulin is inactive.

⚡Side effects

Injection site irritation

mildCommon

Mild immune activation symptoms

mildUncommon

Theoretical autoimmune risk with excessive use

moderateRare

📅Research history

1977

Thymulin (FTS) characterised by Jean-François Bach in Paris

1983

Zinc dependence of thymulin established

1990s

Role in immunosenescence and thymic involution clarified

2014

Gene therapy approaches to restore thymulin levels explored

2020s

Interest renewed alongside growing focus on immune aging

Thymic involution and aging

The thymus is most active during childhood and adolescence, when it trains the immune system by producing mature T-cells. After puberty, it progressively shrinks (involutes) and is largely replaced by fatty tissue. By age 50, thymulin production has declined by 90%+. This contributes to increased infection susceptibility, reduced vaccine response, and higher cancer risk in older adults. Thymulin replacement aims to partially restore this lost immune education function.

References

[1]Bach JF. 'Thymulin (FTS-Zn).' Clinics in Immunology and Allergy, 1983.
[2]Reggiani PC, et al. 'Thymulin gene therapy and anti-aging.' Biogerontology, 2014.

Frequently asked questions

Related peptides

Thymosin Alpha-1

Immune Support

The immune-modulating peptide approved in 30+ countries

3 rated vendors

LL-37

Immune Support

Your body's frontline antimicrobial peptide

0 rated vendors

Need to calculate your dose?

Use our free reconstitution calculator to work out syringe units for Thymulin.

Open Calculator

Disclaimer: This guide is for educational and informational purposes only. It is not medical advice. The dosing protocols listed are sourced from published research and community reports and do not constitute a recommendation. Always consult a qualified healthcare professional before using any peptide. Australian regulations classify many peptides as Schedule 4 (prescription-only) substances. Check current TGA guidelines before purchasing.