Disclosure: We earn a commission from vendors on this page. Rankings are based on objective criteria including price, COA availability, and reputation.

Best Semax Vendors of 2026

Ranked by Price, Purity, and Reputation

Quick Comparison

Rank	Vendor	Price	Amount	$/mg	COA	Score	Action
1	Limitless Biotech	$36.59	20mg	$1.83/mg	Yes	9.6/10	View
2	Penguin Peptides	$55.00	5mg	$11.00/mg	Yes	8.8/10	View
3	Limitless Biotech	$36.59	10mg	$3.66/mg	Yes	8.8/10	View
4	Ascension Peptides	$44.00	10mg	$4.40/mg	Yes	8.8/10	View
5	Certified Pep	$52.00	10mg	$5.20/mg	Yes	8.8/10	View

How We Score Vendors

Our scoring is based on three weighted factors:

Price Competitiveness (40%)

Normalized to cost per milligram for fair comparisons across vial sizes.

COA Availability (30%)

Third-party lab testing confirming purity, identity, and absence of contaminants.

Vendor Reputation (30%)

Community feedback, shipping reliability, customer service, and business track record.

Related Resources

Complete Semax Guide

Dosing protocols, research findings, and safety information

Semax Dosing Guide

Research protocols and administration methods

Peptides A–Z

Tools

Reconstitution Calculator Storage Guide Peptide Matcher