peptide

PT-141

Libidoalso known as Bremelanotide, Vyleesi

A cyclic synthetic peptide derived from Melanotan II, acting on melanocortin receptors (MC3R and MC4R).

FDA-approved as Vyleesi for hypoactive sexual desire disorder in premenopausal women. Mechanism is centrally mediated through the central nervous system rather than vascular, distinguishing it from PDE5 inhibitors.

27 vendors with finnrick test grades. Higher grade = higher confirmed purity. Pricing data is pending for this peptide — grades below reflect independent purity testing.

#	Vendor	Grade	Score	Tests	Reputation
1	Bulk Peptide Supply Great	A	9.9	2	75
2	Peptidology Great	A	9.8	4	76
3	Bulk Peptide Wholesale Great	A	9.5	2	91
4	Peptide Sciences Great	A	9.1	6	66
5	Peptide Technologies Great	A	8.9	2	83
6	Qing Li Peptide Great	A	8.3	6	71
7	Polaris Peptideslogin required Great	A	7.4	6	73
8	Planet Peptide Great	A	7.4	3	72
9	Utherflag Good	B	8.3	4	74
10	Verified Peptides Good	B	6.5	4	70
11	Paramount Peptides Okay	C	8.0	3	67
12	Reta-Peptideflag Okay	C	6.9	5	74
13	Atomik Labzflag Okay	C	6.5	4	77
14	Pure Tested Peptides Okay	C	5.8	2	81
15	Biolabshop Limited Okay	C	5.8	2	33
16	Nuscience Peptides Okay	C	5.7	2	71
17	Science Okay	C	5.7	2	66
18	Biolongevity Labs Okay	C	5.7	3	60
19	HK Peptides Poor	D	7.5	7	69
20	Deuschem Poor	D	5.9	4	41
21	Pharma Grade Peptides Poor	D	5.2	2	54
22	Shanghai Sigma Audley SSA Fraud	F	8.6	5	70
23	Oupeptide Unrated	X	4.7	1	67
24	Amino Asylum Unrated	X	2.5	1	57
25	LiliPeptide Bad	E	5.9	8	74
26	Peptide Gurus Bad	E	3.0	3	36
27	SRY Labs Bad	E	2.2	2	64

Grades sourced from finnrick.com. Grade A = highest confidence in purity based on independent lab testing. Score is averaged across 95 individual tests.