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
$9.92/mg
range $0.07–$71.99/mg
Sellers
68
from $0.00
45-day trend
-1.7%
vs 45-day avg $/mg
56 of 68 sellers have a current price· 15 stale listings hidden (not seen in 7 days)
Top Merit pick
🇺🇸 Glacier Aminos99✓ verified at source · 4h ago
$6.40/mg -35.5% vs avg$63.99
10mg
- 🇺🇸 Peptide Partners99
✓ verified at source · 3h ago
$9.80/mg -1.2% vs avg$98.00
10mg
- 🇺🇸 BioLongevity Labs96
✓ verified at source · 3h ago
$13.00/mg +31% vs avg$130
10mg
- 🇺🇸 Profound Aminos95
via Disclosed Labs · 4h ago
$7.60/mg -23.4% vs avg$76.00
10mg
- 🇺🇸 Orbitrex Peptides95
via Disclosed Labs · 4h ago
$8.00/mg -19.3% vs avg$79.99
10mg
98.2% purity 2 COAs - 🇺🇸 Licensed Peptides95
✓ verified at source · 3h ago
$71.99/mg +625.9% vs avg$360
5mg
- 🇺🇸 Forge Performance Co.94
✓ verified at source · 4h ago
$6.00/mg -39.5% vs avg$60.00
10mg
no purity - 🇺🇸 Riptide Wellness92
via Disclosed Labs · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
98.9% purity 1 COA - 🇺🇸 Hydro Research Peptides91
✓ verified at source · 4h ago
$0.07/mg -99.3% vs avg$0.65
10mg
99.2% purity 2 COAs - 🇺🇸 Peptide Plugs89
✓ verified at source · 4h ago
$6.00/mg -39.5% vs avg$60.00
10mg
no purity 1 COA - 🇺🇸 Peptidology89
✓ verified at source · 4h ago
$7.00/mg -29.4% vs avg$69.99
10mg
- 🇺🇸 Verified Peptides86
via Disclosed Labs · 4h ago
$8.00/mg -19.3% vs avg$80.00
10mg
- 🇺🇸 EZ Peptides85
✓ verified at source · 4h ago
$5.80/mg -41.5% vs avg$58.00
10mg
99.7% purity 3 COAs - Peptide Supply Co.83
via Disclosed Labs · 4h ago
$3.60/mg -63.7% vs avg$360
100mg
- 🇺🇸 Ascension Peptides83
✓ verified at source · 4h ago
$7.10/mg -28.4% vs avg$71.00
10mg
no purity - 🇨🇳 Reta Peptide83
✓ verified at source · 4d ago · stale
$17.50/mg +76.5% vs avg$175
10mg
no purity - 🇺🇸 MedGe Peptides82
✓ verified at source · 3h ago
$11.50/mg +16% vs avg$115
10mg
- 🇺🇸 OROS Research79
via Disclosed Labs · 4h ago
$9.00/mg -9.3% vs avg$44.99
5mg
99.0% purity 2 COAs - 🇺🇸 Texpeptide70
✓ verified at source · 3h ago
$10.00/mg +0.8% vs avg$50.00
5mg
no purity - 🇺🇸 Certified Peptides61
✓ verified at source · 4h ago
$7.80/mg -21.4% vs avg$78.00
10mg
no purity 1 COA - 🇺🇸 Puratek Peptides44
✓ verified at source · 4h ago
$6.00/mg -39.6% vs avg$59.95
10mg
no purity - 🇺🇸 Genetic PeptideUnscored
✓ verified at source · 4h ago
$4.33/mg -56.3% vs avg$65.00
15mg
no purity - S1 ResearchUnscored
✓ verified at source · 4h ago
$4.40/mg -55.6% vs avg$44.00
10mg
no purity - Wellness PeptidesUnscored
✓ verified at source · 4h ago
$4.50/mg -54.6% vs avg$45.00
10mg
no purity - 🇺🇸 Oneday CompoundsUnscored
✓ verified at source · 4h ago
$4.55/mg -54.1% vs avg$45.49
10mg
no purity - 🇺🇸 Southern AminosUnscored
✓ verified at source · 4h ago
$4.55/mg -54.1% vs avg$45.50
10mg
no purity - peptidetech.isUnscored
via Disclosed Labs · 4h ago
$6.00/mg -39.5% vs avg$29.99
5mg
no purity - Platinum LionUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$64.99
10mg
no purity - 🇺🇸 Atomik LabzUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - 🇺🇸 Oasis LabsUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - 🇺🇸 Peptide CraftersUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - 🇺🇸 Polaris PeptidesUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - Solution PeptidesUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - True PeptideUnscored
✓ verified at source · 4h ago
$6.50/mg -34.5% vs avg$65.00
10mg
no purity - synthesispeptides.ioUnscored
✓ verified at source · 4h ago
$7.50/mg -24.4% vs avg$74.99
10mg
no purity - 🇺🇸 Soma PeptidesUnscored
✓ verified at source · 4h ago
$7.75/mg -21.9% vs avg$124
16mg
no purity - 🇺🇸 Pepvida LabsUnscored
✓ verified at source · 4h ago
$8.40/mg -15.3% vs avg$42.00
5mg
no purity - 🇺🇸 Paramount PeptidesUnscored
✓ verified at source · 4h ago
$9.78/mg -1.4% vs avg$97.75
10mg
no purity - 🇺🇸 Biotech PeptidesUnscored
✓ verified at source · 4h ago
$13.00/mg +31.1% vs avg$130
10mg
no purity - 🇺🇸 Core PeptidesUnscored
✓ verified at source · 4h ago
$16.20/mg +63.3% vs avg$81.00
5mg
no purity - 🇺🇸 Bulk PeptidesUnscored
✓ verified at source · 4h ago
$40.00/mg +303.3% vs avg$200
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
107 third-party tests across 24 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.