THY-moh-sin alpha one
An immune-modulating peptide that fine-tunes your immune system — helps it fight infections and cancer without overreacting.
Also known as: Tα1, Zadaxin
Last reviewed: April 2026
Thymosin Alpha-1 is a peptide your thymus gland naturally produces to train and regulate immune cells. It doesn't just 'boost' your immune system — it modulates it, helping it respond appropriately. It enhances T-cell function, natural killer cell activity, and dendritic cell maturation while keeping inflammation in check.
Small injection into belly fat
Frequency
2–3 times per week
Pain Level
●○○ Minimal
Self-Administered
Yes — at home
Typical Range
1.6mg per injection
Week 1–2
Immune cell activation begins (not always noticeable).
Month 1
Improved resilience. May notice fewer or shorter illnesses.
Month 3+
Sustained immune optimization.
Overall: Mild
Injection site reaction
Redness or mild soreness.
Fatigue
Brief tiredness as immune system adjusts.
• Organ transplant recipients on immunosuppressants
• Autoimmune conditions in acute flare
• Immunosuppressants — may counteract their effects
Pregnancy: Limited data. Avoid during pregnancy.
Both modulate the immune system. Tα1 works directly on immune cells. LDN works through opioid receptor modulation. Different mechanisms, similar goals.
Open Full Comparison Tool →We don't currently offer this peptide — but we have protocols for similar goals.
Coming Soon →This is a compounded medication prescribed off-label. It has not been FDA-approved for the uses described. All prescribing decisions are made by your independent licensed provider.