IGF-1 LR3 vs Thymosin Alpha-1
Side-by-side comparison of key properties, dosing, and research.
Anabolic & IGF
IGF-1 LR3Immune SupportAnti-Aging & Longevity
Thymosin Alpha-1- Summary
- IGF-1 LR3 is a synthetic analog of Insulin-like Growth Factor-1 with an extended half-life. It is one of the most potent anabolic peptides available, directly stimulating muscle cell hyperplasia and hypertrophy, and is the downstream mediator of many of GH's anabolic effects.
- Thymosin Alpha-1 is a naturally occurring 28-amino acid peptide derived from the thymus gland. It is a powerful immune modulator approved in many countries for treating chronic hepatitis B, hepatitis C, and as an adjunct in cancer immunotherapy.
- Half-Life
- 20–30 hours
- 2–3 hours
- Admin Route
- SubQ, IM
- SubQ
- Research
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- Typical Dose
- 40–80 mcg
- 0.8–1.6 mg
- Frequency
- Once daily or split twice daily
- Twice weekly
- Key Benefits
- Direct muscle hypertrophy via IGF-1R stimulation
- Muscle hyperplasia (new fiber formation) — unique among peptides
- Rapid gains in lean muscle mass
- Accelerated recovery from training and injury
- Increased nutrient uptake by muscle cells
- Fat oxidation enhancement
- Bone density improvement
- Cartilage and connective tissue repair
- Enhances T-cell and NK cell activity
- Supports recovery from viral and bacterial infections
- May reduce inflammation systemically
- Supports healthy aging and immune resilience
- Improves vaccine response
- Supports liver health
- May help with chronic fatigue syndrome and post-viral conditions
- Approved in multiple countries for hepatitis B and C treatment
- Side Effects
- Hypoglycemia (significant risk — insulin-like activity)
- Acromegaly-like effects with excessive long-term use
- Jaw and hand swelling
- Organ hypertrophy with extreme doses
- +2 more
- Injection site irritation
- Mild flu-like symptoms initially (immune activation)
- Fatigue (rare)
- Stacks With
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