GHRP-6 vs Thymalin
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
GHRP-6
Growth Hormone Releasing Peptide 6 (GHRP-6) is one of the first synthetic growth hormone secretagogues discovered. It stimulates significant GH release but is known for causing intense hunger.
Full details →Thymalin
Thymalin is a polypeptide preparation derived from calf thymus. Developed in Russia, it has been used for decades to support immune function and has shown potential anti-aging effects in long-term studies.
Full details →Side-by-Side Comparison
| Aspect | GHRP-6 | Thymalin |
|---|---|---|
| Dose Range | 100 mcg–300 mcg | 5 mg–10 mg |
| Frequency | 3x daily | 1x daily |
| Cycle Length | 8–12 weeks | 1–2 weeks |
| Route | subcutaneous | intramuscular |
| Mechanism | Acts as a ghrelin mimetic, binding to the GHS-R receptor in the pituitary and hypothalamus. Stimulates GH release and also significantly increases appetite by mimicking ghrelin's hunger-signaling effects. | Regulates the ratio of T-cell subpopulations, stimulates cellular immunity, and enhances phagocytosis. Also affects neuroendocrine regulation and may influence melatonin production. |
| Typical Dosage | Typical dosing: 100-300mcg administered 2-3 times daily. Often combined with GHRH peptides like CJC-1295 for synergistic effects. | Clinical protocols: 5-20mg daily intramuscularly for 3-10 days. Often cycled 1-2 times per year for maintenance. |
| Administration | Subcutaneous injection. Best administered on an empty stomach. The strong hunger response can be beneficial for those trying to gain weight but challenging for cutting. | Intramuscular injection. Usually administered in short courses rather than continuously. Often combined with Epithalamin for anti-aging protocols. |
| Side Effects | Intense hunger (most notable effect), water retention, increased cortisol and prolactin, tingling/numbness, and potential blood pressure changes. | Generally well-tolerated. May cause injection site reactions or temporary flu-like symptoms as immune function is modulated. |
| Best For |
Key Differences
Unique to GHRP-6:
Unique to Thymalin:
Key Studies
GHRP-6
- Growth hormone-releasing peptide 6 (GHRP-6) hydrogel for acute kidney injury therapy via metabolic regulation.
Journal of nanobiotechnology, 2025
- Growth hormone releasing peptide-6 (GHRP-6) prevents doxorubicin-induced myocardial and extra-myocardial damages by activating prosurvival mechanisms.
Frontiers in pharmacology, 2024
- [D-Lys3]-GHRP-6 exhibits pro-autophagic effects on skeletal muscle.
Molecular and cellular endocrinology, 2015
Thymalin
- Reparative osteogenesis in mandible in cases of filling a bone defect with hydroxyapatite-containing osteotropic material and injecting the surrounding soft tissues with thymalin: experimental and morphological study.
Wiadomosci lekarskie (Warsaw, Poland : 1960), 2024
- Expression features of T-lymphocytes, B-lymphocytes and macrophages in the post-traumatic regenerate of the mandible rats under conditions of filling a bone defect with hydroxyapatite-containing osteotropic material and thymalin injecting the surrounding soft tissues.
Polski merkuriusz lekarski : organ Polskiego Towarzystwa Lekarskiego, 2024
- The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19.
International journal of molecular sciences, 2023
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