Thymulin vs HGH Fragment 176-191
Side-by-side comparison of key properties, dosing, and research.
Immune Support
ThymulinFat Loss & Metabolic
HGH Fragment 176-191- Summary
- Thymulin is a nonapeptide hormone produced exclusively by the thymic epithelium. It requires zinc for biological activity and plays a critical role in T-lymphocyte maturation, differentiation, and immune regulation. Thymulin levels decline dramatically with age, contributing to immunosenescence.
- HGH Fragment 176-191 (also known as AOD-9604) is a stabilized, modified fragment of the human growth hormone molecule corresponding to amino acids 176–191 with an addition of a tyrosine residue at the N-terminus. It retains HGH's fat-burning properties without the anabolic, diabetogenic, or IGF-1-stimulating effects.
- Half-Life
- ~30 minutes active half-life
- ~30 minutes
- Admin Route
- SubQ
- SubQ
- Research
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- Typical Dose
- 20-30 mcg
- 250–500 mcg
- Frequency
- 10 days per month (Khavinson protocol)
- 1–3 times daily
- Key Benefits
- Enhances T-cell maturation and differentiation
- Boosts NK cell cytotoxic activity
- Reduces inflammatory cytokine production (TNF-α, IL-1)
- Anti-nociceptive (pain-reducing) properties
- Restores age-related immune decline
- Anti-inflammatory via serotonin pathway modulation
- Selective fat burning without anabolic side effects
- Reduces visceral and subcutaneous fat
- No insulin resistance or blood glucose disruption
- Does not stimulate IGF-1
- May support cartilage and bone repair (at higher doses)
- No effect on growth or organ size
- Side Effects
- Injection site reactions
- Mild fatigue initially as immune system activates
- Injection site irritation
- Temporary lethargy
- Headache (rare)
- Nausea (rare)
- Stacks With
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