Synthetic fragment of Thymosin Beta-4 active site. Studied for actin sequestration, cell migration, and tissue repair. Merit Verified tracks independent COA test results for TB-500 from multiple vendors.

Which vendors sell TB-500 with independent COA testing?

34 vendors in the Merit Verified directory have independent COA evidence on file for TB-500 — 218 COAs total. COA coverage and test dates are listed on the TB-500 page at https://meritverified.org/peptides/tb-500.

How do I verify the quality of TB-500 from a vendor?

To verify TB-500 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 TB-500 at https://meritverified.org/peptides/tb-500 so you can compare evidence across vendors before buying.

What is the regulatory status of TB-500?

TB-500 is classified as research-use only in the Merit Verified registry. In the United States, the FDA removed several peptides including BPC-157, TB-500, and GLP-1 analogues from the 503A compounding ingredient list in April 2026, restricting their use in compounded drugs for human administration. Vendors selling TB-500 for research purposes are not selling it as a drug or supplement; the legal status of purchasing for personal use varies by jurisdiction. Merit Verified does not provide legal or medical advice — confirm current regulatory status with a licensed professional.

Healing & Recovery

TB-500

Also known as: Thymosin Beta-4 fragment, TB4 fragment

Research use only · not FDA-approved

Synthetic fragment of Thymosin Beta-4 active site. Studied for actin sequestration, cell migration, and tissue repair.

Where to buy · live market data

Who's worth your money for TB-500

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

🇺🇸 Peptide Partners 99

Highest Merit Score (99) of 22 scored sellers

$4.90/mg

$490 · 100mg · 99.8% purity

16 COAs

Buy

Best value

Peptide Supply Co. 83

Lowest $/mg among scored sellers

$3.40/mg

$340 · 100mg · 99.2% purity

1 COA

Buy

Most tested

🇺🇸 Verified Peptides 86

57 independent COAs on file

$6.20/mg

$62.00 · 10mg · 99.0% purity

57 COAs

Buy

Average price

$8.38/mg

range $1.20–$58.49/mg

Sellers

from $29.00

45-day trend

-1.7%

vs 45-day avg $/mg

71 of 86 sellers have a current price· 19 stale hidden· 30 unverified hidden

	Vendor	Price	$/mg	vs avg	Purity	COAs	Merit
🇺🇸	Peptide Partners via Disclosed Labs · 23h ago	$490· 100mg	$4.90/mg	-41.5%	99.8%	16	99	Buy
🇺🇸	Glacier Aminos ✓ verified at source · 23h ago	$58.99· 10mg	$5.90/mg	-29.6%	99.9%	2	99	Buy code MERIT · 10% off
🇺🇸	Moglabs via Disclosed Labs · 23h ago	$38.00· 5mg	$7.60/mg	-9.3%	99.2%	3	96	Buy
🇺🇸	BioLongevity Labs ✓ verified at source · 23h ago	$165· 10mg	$16.50/mg	+96.9%	99.8%	9	96	Buy code MERIT · 15% off
🇺🇸	Orbitrex Peptides via Disclosed Labs · 23h ago	$59.99· 10mg	$6.00/mg	-28.4%	99.5%	4	95	Buy code Orbitrex10 · 10% off
🇺🇸	Profound Aminos via Disclosed Labs · 23h ago	$65.00· 10mg	$6.50/mg	-22.4%	99.2%	4	95	Buy
🇺🇸	Licensed Peptides ✓ verified at source · 23h ago	$585· 10mg	$58.49/mg	+598.2%	99.8%	2	95	Buy code MERIT · 5% off
🇺🇸	Forge Performance Co. ✓ verified at source · 23h ago	$60.00· 10mg	$6.00/mg	-28.4%	99.6%	3	94	Buy code MERIT · 10% off
🇺🇸	Ignite Peptides ✓ verified at source · 23h ago	$65.00· 10mg	$6.50/mg	-22.4%	99.7%	3	92	Buy code MERIT · 10% off
🇺🇸	Hydro Research Peptides ✓ verified at source · 23h ago	$65.00· 10mg	$6.50/mg	-22.4%	99.3%	4	91	Buy code MERIT · 15% off

Top Merit pick

🇺🇸 Peptide Partners
via Disclosed Labs · 23h ago
99

$4.90/mg -41.5% vs avg

$490

100mg

99.8% purity 16 COAs

Buy
🇺🇸 Glacier Aminos
✓ verified at source · 23h ago
99

$5.90/mg -29.6% vs avg

$58.99

10mg

99.9% purity 2 COAs

Buy code MERIT · 10% off
🇺🇸 Moglabs
via Disclosed Labs · 23h ago
96

$7.60/mg -9.3% vs avg

$38.00

5mg

99.2% purity 3 COAs

Buy
🇺🇸 BioLongevity Labs
✓ verified at source · 23h ago
96

$16.50/mg +96.9% vs avg

$165

10mg

99.8% purity 9 COAs

Buy code MERIT · 15% off
🇺🇸 Orbitrex Peptides
via Disclosed Labs · 23h ago
95

$6.00/mg -28.4% vs avg

$59.99

10mg

99.5% purity 4 COAs

Buy code Orbitrex10 · 10% off
🇺🇸 Profound Aminos
via Disclosed Labs · 23h ago
95

$6.50/mg -22.4% vs avg

$65.00

10mg

99.2% purity 4 COAs

Buy
🇺🇸 Licensed Peptides
✓ verified at source · 23h ago
95

$58.49/mg +598.2% vs avg

$585

10mg

99.8% purity 2 COAs

Buy code MERIT · 5% off
🇺🇸 Forge Performance Co.
✓ verified at source · 23h ago
94

$6.00/mg -28.4% vs avg

$60.00

10mg

99.6% purity 3 COAs

Buy code MERIT · 10% off
🇺🇸 Ignite Peptides
✓ verified at source · 23h ago
92

$6.50/mg -22.4% vs avg

$65.00

10mg

99.7% purity 3 COAs

Buy code MERIT · 10% off
🇺🇸 Hydro Research Peptides
✓ verified at source · 23h ago
91

$6.50/mg -22.4% vs avg

$65.00

10mg

99.3% purity 4 COAs

Buy code MERIT · 15% off

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.