Human Growth Hormone (HGH) vs Thymulin
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Human Growth Hormone (HGH)
Human Growth Hormone (somatropin) is a 191-amino acid protein identical to naturally produced GH. FDA-approved for growth hormone deficiency, Turner syndrome, and other conditions. Widely used off-label for anti-aging and performance.
Full details →Thymulin
Thymulin (Facteur Thymique Sérique) is a zinc-dependent nonapeptide hormone produced by thymic epithelial cells. It plays important roles in T-cell differentiation and immune system maturation.
Full details →Side-by-Side Comparison
| Aspect | Human Growth Hormone (HGH) | Thymulin |
|---|---|---|
| Dose Range | 200 mcg–2 mg | 100 mcg–400 mcg |
| Frequency | 1x daily | 1x daily |
| Cycle Length | 12–24 weeks | 4–8 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Binds to GH receptors throughout the body, stimulating IGF-1 production in the liver. Promotes protein synthesis, fat metabolism, and cellular regeneration across multiple tissues. | Requires zinc for biological activity. Promotes T-cell differentiation, modulates cytokine production, and influences neuroendocrine function. Levels decline significantly with age. |
| Typical Dosage | Medical: 0.1-0.3mg/kg/week divided into daily doses. Anti-aging: 1-2 IU daily. Performance: 2-6 IU daily, sometimes higher. | Research protocols vary. Often studied alongside zinc supplementation. Typical research doses in the microgram range. |
| Administration | Subcutaneous injection, preferably at night to mimic natural pulsatile release. Rotate injection sites. Store refrigerated. | Subcutaneous or intramuscular injection in research settings. Requires adequate zinc status for activity. |
| Side Effects | Joint pain, water retention, carpal tunnel syndrome, potential insulin resistance, and acromegaly features with long-term high doses. | Limited data on exogenous administration. Theoretical effects on immune function require monitoring. |
| Best For |
What They Have in Common
Human Growth Hormone (HGH), Thymulin are both commonly used for:
Key Differences
Unique to Human Growth Hormone (HGH):
Unique to Thymulin:
Which Has Stronger Evidence?
| Goal | Human Growth Hormone (HGH) | Thymulin |
|---|---|---|
| Anti-Aging & Longevity | medium | medium |
Key Studies
Human Growth Hormone (HGH)
- Transgenic Artifacts Caused by Passenger Human Growth Hormone.
Trends in endocrinology and metabolism: TEM, 2018
- [Human growth hormone and Turner syndrome].
Anales de pediatria (Barcelona, Spain : 2003), 2017
- Significance of the disulphide bonds of human growth hormone.
Endokrynologia Polska, 2013
Thymulin
- Thymulin restrains age-associated myeloid inflammation and enhances cancer immunotherapy.
Nature communications, 2026
- Thymulin and peroxiredoxin 6 have protective effects against streptozotocin-induced type 1 diabetes in mice.
International journal of immunopathology and pharmacology, 2021
- Nanoparticle-based thymulin gene therapy therapeutically reverses key pathology of experimental allergic asthma.
Science advances, 2020
Ready to Learn More?
Looking for trusted sources?