Thymosin Alpha-1
Also known as: Thymalfasin (trade name Zadaxin)
Thymosin Alpha-1 (Ta1) is a 28-amino-acid thymic peptide (Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN) approved as Zadaxin in 35+ countries for chronic hepatitis B/C and as an immune adjuvant. It is NOT FDA-approved in the US.
Pricing for Thymosin Alpha-1
Live vendor pricing, normalized to $/mg so sizes compare fairly — fused with each seller's Merit trust score and latest independent COA purity. Prices refresh daily.
Average price
$9.01/mg
range $0.07–$40.00/mg
Sellers
65
from $0.00
45-day trend
-5.2%
vs 45-day avg $/mg
59 of 65 sellers have a current price· 37 stale listings hidden (not seen in 7 days)
Top Merit pick
🇺🇸 Peptide Partners99via Disclosed Labs · just now
$3.70/mg -58.9% vs avg$370
100mg
- 🇺🇸 Glacier Aminos99
✓ verified at source · just now
$6.40/mg -29% vs avg$63.99
10mg
- 🇺🇸 BioLongevity Labs96
via Disclosed Labs · just now
$13.00/mg +44.3% vs avg$130
10mg
- 🇺🇸 Profound Aminos95
via Disclosed Labs · just now
$7.60/mg -15.6% vs avg$76.00
10mg
- 🇺🇸 Orbitrex Peptides95
via Disclosed Labs · just now
$8.00/mg -11.2% vs avg$79.99
10mg
98.2% purity 2 COAs - 🇺🇸 Licensed Peptides95
✓ verified at source · just now
$12.40/mg +37.6% vs avg$61.99
5mg
- 🇺🇸 Forge Performance Co.94
✓ verified at source · just now
$6.00/mg -33.4% vs avg$60.00
10mg
no purity - 🇺🇸 Riptide Wellness92
via Disclosed Labs · just now
$6.50/mg -27.9% vs avg$65.00
10mg
98.9% purity 1 COA - 🇺🇸 Hydro Research Peptides91
✓ verified at source · just now
$0.07/mg -99.3% vs avg$0.65
10mg
99.2% purity 2 COAs - 🇺🇸 Peptide Plugs89
✓ verified at source · just now
$6.00/mg -33.4% vs avg$60.00
10mg
no purity 1 COA - 🇺🇸 Peptidology89
✓ verified at source · just now
$7.00/mg -22.3% vs avg$69.99
10mg
- 🇺🇸 Verified Peptides86
via Disclosed Labs · just now
$8.00/mg -11.2% vs avg$80.00
10mg
- 🇺🇸 EZ Peptides85
✓ verified at source · just now
$5.80/mg -35.6% vs avg$58.00
10mg
99.7% purity 3 COAs - 🇺🇸 Simple Peptide85
via Disclosed Labs · just now
$8.60/mg -4.5% vs avg$86.00
10mg
- 🇺🇸 Ascension Peptides84
✓ verified at source · just now
$7.10/mg -21.2% vs avg$71.00
10mg
no purity - Peptide Supply Co.83
via Disclosed Labs · just now
$3.60/mg -60% vs avg$360
100mg
- 🇨🇳 Reta Peptide83
✓ verified at source · just now
$17.50/mg +94.2% vs avg$175
10mg
no purity - 🇺🇸 MedGe Peptides82
✓ verified at source · just now
$11.50/mg +27.6% vs avg$115
10mg
- 🇺🇸 OROS Research79
via Disclosed Labs · just now
$9.00/mg -0.1% vs avg$44.99
5mg
99.0% purity 2 COAs - 🇺🇸 Texpeptide65
✓ verified at source · just now
$10.00/mg +11% vs avg$50.00
5mg
no purity - 🇺🇸 Certified Peptides62
✓ verified at source · just now
$7.80/mg -13.4% vs avg$78.00
10mg
no purity 1 COA - peptidetech.isUnscored
via Disclosed Labs · just now
$6.00/mg -33.4% vs avg$29.99
5mg
no purity
Prices observed from public storefronts (last 24h), normalized to $/mg. "Evidence" is Merit's 0–100 Merit Score, derived only from observable verification evidence (methodology on /about); "Purity" is the latest independent COA. Some buy links are affiliate links — Merit may earn a commission at no extra cost to you, and where a vendor offers one, the code shown gets you a discount at their checkout. Affiliate status never affects price data, ranking, or the Merit Score (full policy on /disclosure). Research use only.
COAs for Thymosin Alpha-1
106 third-party tests across 23 vendors. Each card links to the full report.
For
Thymosin Alpha-1
by NG Peptide· batch TA1-05
For
Thymosin Alpha-1
by EZ Peptides· batch EZP-TA11006052026-04
For
Thymosin Alpha-1
by Verified Peptides· batch TA05260910H
For
Thymosin Alpha-1
by Skye Peptides· batch TA126-10-001
For
Thymosin Alpha-1
by Real Peptides· batch Black Cap
For
Thymosin Alpha-1
by Pepsgpt· batch P-1947064-P
For
Thymosin Alpha-1
by Riptide Wellness· batch RWTA1-10-1003
For
Thymosin alpha-1
by Ion Peptide· batch TA110-04202026
For
Thymosin Alpha-1
by Peptide Supply Co.· batch TA1004132026
For
Thymosin Alpha-1
by OROS Research· batch OR-LPTA5-326-B1
For
Thymosin
by Verified Peptides· batch cmojb57q300trkirxximley58
For
Thymosin Alpha-1
by Amino Club· batch THA0001
For
Thymosin alpha-1
by Ion Peptide· batch TA110-03232026
For
Thymosin alpha-1
by Ion Peptide· batch TA110-03232026
For
Thymosin Alpha-1
by Profound Aminos· batch cmojb89io01hzkirx1zv5axqw
For
Thymosin Alpha-1
by Verified Peptides· batch TA032608106
For
Thymosin Alpha-1
by Peptide Partners· batch TA202602
For
Thymosin alpha-1
by Peptide Partners· batch TA202602
For
Thymosin Alpha-1
by Ion Peptide· batch TA110-02122026
For
Thymosin Alpha-1
by Glacier Aminos· batch TA10GA-03
For
Thymosin Alpha-1
by Crush Research· batch CR-TAT10-0212-1
For
Thymosin Alpha-1
by Ion Peptide· batch TA110-02122026
For
Thymosin Alpha-1
by Peptide Supply Co.· batch PSCTA110001
For
Thymoген
by BioLongevity Labs· batch 44-3-46035
20 citations indexed for Thymosin Alpha-1
Study · 2026
Thymosin Alpha-1 Restores Chemotherapy-Induced Antitumor Immunity by Chaperoning a MicroRNA Ligand of TLR7 in Dendritic Cells
Chemotherapy induces cancer cell apoptosis and the release of apoptotic bodies (ABs) that are poorly immunogenic or immunosuppressive, creating a major barrier to the success of co-administered or second-line immunotherapies.
Study · 2026
A Case Report of a Multisystemic Immune-Related Adverse Event Caused by Sintilimab in Combination With Thymosin Alpha-1
To report a case of a nasopharyngeal carcinoma patient who developed multisystem immune-related adverse events (irAEs) after treatment with sintilimab (PD-1 inhibitor) in combination with thymosin alpha-1 (Tα1). The patient presents with high fever, rash, interstitial pulmonary edema, and multiple organ failure.
review · 2025
Aging and Thymosin Alpha-1
Aging is characterized by immune decline, mainly due to thymic involution-the age-related shrinkage of the thymus gland. This leads to reduced T-cell production, chronic inflammation, and increased susceptibility to age-related diseases.
Study · 2025
The Immunomodulatory Activity of Thymosin Alpha 1 on Tumor Cell Lines and Distinct Immune Cell Subsets
Background The immune-balancing role of thymosin alpha 1 (Tα1) is well-recognized in contexts of immune dysregulation. Within the anti-tumor context, Tα1 demonstrated to act as an immune-enhancer, with potential roles in immunotherapy-based treatments.
meta-analysis · 2025
Thymosin alpha 1 alleviates inflammation and prevents infection in patients with severe acute pancreatitis through immune regulation: a systematic review and meta-analysis
Background Immune and inflammatory disorders are part of the complex pathophysiological processes that exacerbate severe acute pancreatitis (SAP) and subsequent infection.
Study · 2025
The efficacy and safety of thymosin alpha-1 combined with lenvatinib plus sintilimab in unresectable hepatocellular carcinoma: a retrospective study
To validate the efficacy and safety of thymosin α-1 combined with lenvatinib plus sintilimab in the treatment of unresectable hepatocellular carcinoma.