Which vendors sell Thymosin Alpha-1 with independent COA testing?

33 vendors in the Merit Verified directory have independent COA evidence on file for Thymosin Alpha-1 — 124 COAs total. COA coverage and test dates are listed on the Thymosin Alpha-1 page at https://meritverified.org/peptides/thymosin-alpha-1.

How do I verify the quality of Thymosin Alpha-1 from a vendor?

To verify Thymosin Alpha-1 quality, look for an independent certificate of analysis (COA) from a third-party lab — not a lab the vendor owns or pays directly. The COA should state the tested compound, lot number, purity percentage (identity and concentration), and the lab's name. Cross-reference the lot number against the vendor's current stock. Merit Verified indexes COAs for Thymosin Alpha-1 at https://meritverified.org/peptides/thymosin-alpha-1 so you can compare evidence across vendors before buying.

What is the regulatory status of Thymosin Alpha-1?

Thymosin Alpha-1 is tracked in the Merit Verified registry. Regulatory status for research peptides in the US has been evolving — the FDA has reclassified a number of peptides out of the 503A compounding ingredient list since 2025. Merit Verified does not provide legal or regulatory advice; check official FDA sources or consult a licensed professional for the current status of Thymosin Alpha-1 in your jurisdiction.

Immune Modulator

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.

Where to buy · live market data

Who's worth your money for Thymosin Alpha-1

Every current seller, ranked by independent evidence — Merit Score, latest COA purity, and live $/mg (size-normalized). Prices refresh daily. Rankings are never paid.

Top Merit pick

🇺🇸 Glacier Aminos 99

Highest Merit Score (99) of 31 scored sellers

$6.40/mg

$63.99 · 10mg · 99.7% purity

6 COAs

Buy code MERIT · 10% off

Best value after code

🇺🇸 Hydro Research Peptides 97

$0.06/mg effective with 15% code

$0.07/mg

$0.65 · 10mg · 99.2% purity

2 COAs

Buy code MERIT · 15% off

Most tested

🇺🇸 Verified Peptides 87

21 independent COAs on file

$4.80/mg

$48.00 · 10mg · 99.6% purity

21 COAs

Buy

Average price

$8.83/mg

range $0.07–$40.00/mg

Sellers

from $0.65

45-day trend

-10.7%

vs 45-day avg $/mg

59 of 71 sellers have a current price· 20 stale hidden· 8 unverified hidden

	Vendor	Price	$/mg	vs avg	Purity	COAs	Merit
🇺🇸	Glacier Aminos ✓ verified at source · just now	$63.99· 10mg	$6.40/mg	-27.6%	99.7%	6	99	Buy code MERIT · 10% off
🇺🇸	Hydro Research Peptides ✓ verified at source · just now	$0.65· 10mg	$0.07/mg	-99.3%	99.2%	2	97	Buy code MERIT · 15% off
🇺🇸	Moglabs ✓ verified at source · just now	$36.00· 5mg	$7.20/mg	-18.5%	—	—	96	Buy
🇺🇸	BioLongevity Labs ✓ verified at source · just now	$130· 10mg	$13.00/mg	+47.1%	99.8%	6	96	Buy code MERIT · 15% off
🇺🇸	Licensed Peptides ✓ verified at source · just now	$61.99· 5mg	$12.40/mg	+40.3%	99.1%	2	95	Buy code MERIT · 5% off
🇺🇸	Peptide Crafters ✓ verified at source · just now	$55.25· 10mg	$5.53/mg	-37.5%	99.8%	2	94	Buy code CRAFTERS10 · 10% off
🇺🇸	Forge Performance Co. ✓ verified at source · just now	$60.00· 10mg	$6.00/mg	-32.1%	—	—	94	Buy code MERIT · 10% off
🇺🇸	Riptide Wellness ✓ verified at source · just now	$65.00· 10mg	$6.50/mg	-26.4%	98.9%	1	92	Buy
🇺🇸	Polaris Peptides ✓ verified at source · just now	$65.00· 10mg	$6.50/mg	-26.4%	—	—	90	Buy
🇺🇸	Peptidology ✓ verified at source · just now	$69.99· 68mg	$1.03/mg	-88.3%	99.8%	3	89	Buy

Top Merit pick

🇺🇸 Glacier Aminos
✓ verified at source · just now
99

$6.40/mg -27.6% vs avg

$63.99

10mg

99.7% purity 6 COAs

Buy code MERIT · 10% off
🇺🇸 Hydro Research Peptides
✓ verified at source · just now
97

$0.07/mg -99.3% vs avg

$0.65

10mg

99.2% purity 2 COAs

Buy code MERIT · 15% off
🇺🇸 Moglabs
✓ verified at source · just now
96

$7.20/mg -18.5% vs avg

$36.00

5mg

no purity

Buy
🇺🇸 BioLongevity Labs
✓ verified at source · just now
96

$13.00/mg +47.1% vs avg

$130

10mg

99.8% purity 6 COAs

Buy code MERIT · 15% off
🇺🇸 Licensed Peptides
✓ verified at source · just now
95

$12.40/mg +40.3% vs avg

$61.99

5mg

99.1% purity 2 COAs

Buy code MERIT · 5% off
🇺🇸 Peptide Crafters
✓ verified at source · just now
94

$5.53/mg -37.5% vs avg

$55.25

10mg

99.8% purity 2 COAs

Buy code CRAFTERS10 · 10% off
🇺🇸 Forge Performance Co.
✓ verified at source · just now
94

$6.00/mg -32.1% vs avg

$60.00

10mg

no purity

Buy code MERIT · 10% off
🇺🇸 Riptide Wellness
✓ verified at source · just now
92

$6.50/mg -26.4% vs avg

$65.00

10mg

98.9% purity 1 COA

Buy
🇺🇸 Polaris Peptides
✓ verified at source · just now
90

$6.50/mg -26.4% vs avg

$65.00

10mg

no purity

Buy
🇺🇸 Peptidology
✓ verified at source · just now
89

$1.03/mg -88.3% vs avg

$69.99

68mg

99.8% purity 3 COAs

Buy

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.

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Compound reference

About Thymosin Alpha-1

CAS

62304-98-7

Molecular formula

C129H215N33O55

Sequence

SDAAVDTSSEITTKDLKEKKEVVEEAEN

Typical dose range

1.6 mg subcutaneous 2–3x/week (clinical standard); research protocols range 1.6–6.4 mg per dose

Half-life

~2–3 hours (subcutaneous; elimination t½ <3 h confirmed by PK study)

Independent evidence

COAs for Thymosin Alpha-1

124 third-party tests across 33 vendors. Each card links to the full report.

All 124 COAs for Thymosin Alpha-1 →

Measured purity over time

Thymosin Alpha-1

Who's worth your money for Thymosin Alpha-1

Watch Thymosin Alpha-1

About Thymosin Alpha-1

COAs for Thymosin Alpha-1

20 citations indexed for Thymosin Alpha-1

Thymosin Alpha-1 Restores Chemotherapy-Induced Antitumor Immunity by Chaperoning a MicroRNA Ligand of TLR7 in Dendritic Cells

A Case Report of a Multisystemic Immune-Related Adverse Event Caused by Sintilimab in Combination With Thymosin Alpha-1

A Study Evaluating Neoadjuvant Chemotherapy, Concurrent Chemoradiotherapy Combined With Dual Immune Checkpoint Blockade in Patients With Locally Advanced Non-Small Cell Lung Cancer

Aging and Thymosin Alpha-1

The Immunomodulatory Activity of Thymosin Alpha 1 on Tumor Cell Lines and Distinct Immune Cell Subsets

Thymosin alpha 1 alleviates inflammation and prevents infection in patients with severe acute pancreatitis through immune regulation: a systematic review and meta-analysis