Which vendors sell Retatrutide with independent COA testing?

54 vendors in the Merit Verified directory have independent COA evidence on file for Retatrutide — 494 COAs total. COA coverage and test dates are listed on the Retatrutide page at https://meritverified.org/peptides/retatrutide.

How do I verify the quality of Retatrutide from a vendor?

To verify Retatrutide 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 Retatrutide at https://meritverified.org/peptides/retatrutide so you can compare evidence across vendors before buying.

What is the regulatory status of Retatrutide?

Retatrutide 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 Retatrutide in your jurisdiction.

GLP-1 / Metabolic

Retatrutide

Also known as: Retatrutide (LY3437943 — GLP-1/GIP/Glucagon triple agonist)

Retatrutide (Eli Lilly code LY3437943) is an investigational triple-receptor agonist simultaneously targeting GLP-1, GIP, and glucagon receptors. It is research-only and NOT FDA-approved as of April 2026; the Phase 3 TRIUMPH program is ongoing with anticipated NDA filing in 2026. Published Phase 2 data showed roughly 24% mean body weight loss at 48 weeks on 12 mg weekly (Jastreboff, NEJM 2023).

Where to buy · live market data

Who's worth your money for Retatrutide

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

🇺🇸 Prime Peptides 95

Highest Merit Score (95) of 7 scored sellers

$1.83/mg

$110 · 60mg · 99.5% purity

7 COAs

Buy

Best value

🇭🇰 Hkuppeptide 49

Lowest $/mg among scored sellers

$1.00/mg

$10.00 · 10mg · 99.8% purity

1 COA

Buy

Most tested

🇺🇸 Polaris Peptides 90

14 independent COAs on file

$8.67/mg

$130 · 15mg · 99.9% purity

14 COAs

Buy

Average price

$7.06/mg

range $0.97–$36.00/mg

Sellers

from $10.00

45-day trend

+3.5%

vs 45-day avg $/mg

72 of 82 sellers have a current price· 65 stale hidden

	Vendor	Price	$/mg	vs avg	Purity	COAs	Merit
🇺🇸	Prime Peptides ✓ verified at source · just now	$110· 60mg	$1.83/mg	-74%	99.5%	7	95	Buy
🇺🇸	Polaris Peptides ✓ verified at source · just now	$130· 15mg	$8.67/mg	+22.7%	99.9%	14	90	Buy
🇨🇳	Reta Peptide ✓ verified at source · just now	$135· 10mg	$13.50/mg	+91.2%	99.5%	14	83	Buy
🇺🇸	Blank Peptides ✓ verified at source · just now	$105· 30mg	$3.50/mg	-50.4%	99.5%	5	81	Buy affiliate
🇺🇸	Bulk Peptides ✓ verified at source · just now	$360· 10mg	$36.00/mg	+409.9%	99.8%	1	50	Buy
🇭🇰	Hkuppeptide ✓ verified at source · just now	$10.00· 10mg	$1.00/mg	-85.8%	99.8%	1	49	Buy
🇭🇰	zztai Peptide Ltd ✓ verified at source · just now	$280· 30mg	$9.33/mg	+32.2%	99.9%	1	42	Buy

Top Merit pick

🇺🇸 Prime Peptides
✓ verified at source · just now
95

$1.83/mg -74% vs avg

$110

60mg

99.5% purity 7 COAs

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

$8.67/mg +22.7% vs avg

$130

15mg

99.9% purity 14 COAs

Buy
🇨🇳 Reta Peptide
✓ verified at source · just now
83

$13.50/mg +91.2% vs avg

$135

10mg

99.5% purity 14 COAs

Buy
🇺🇸 Blank Peptides
✓ verified at source · just now
81

$3.50/mg -50.4% vs avg

$105

30mg

99.5% purity 5 COAs

Buy affiliate
🇺🇸 Bulk Peptides
✓ verified at source · just now
50

$36.00/mg +409.9% vs avg

$360

10mg

99.8% purity 1 COA

Buy
🇭🇰 Hkuppeptide
✓ verified at source · just now
49

$1.00/mg -85.8% vs avg

$10.00

10mg

99.8% purity 1 COA

Buy
🇭🇰 zztai Peptide Ltd
✓ verified at source · just now
42

$9.33/mg +32.2% vs avg

$280

30mg

99.9% purity 1 COA

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.