Thymosin Alpha-1
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
What It Does
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.
Why People Take It
How It's Administered
Subcutaneous Injection
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
What To Expect
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.
Side Effects
Overall: Mild
Common (1–10%)
Injection site reaction
Redness or mild soreness.
Uncommon (0.1–1%)
Fatigue
Brief tiredness as immune system adjusts.
Who Should NOT Take This
• Organ transplant recipients on immunosuppressants
• Autoimmune conditions in acute flare
Drug Interactions
• Immunosuppressants — may counteract their effects
Pregnancy: Limited data. Avoid during pregnancy.
Clinical Details
Compare With Similar Peptides
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 →Frequently Asked Questions
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.