Most Improved, Rankings | The Peptide Institute

Rank	Company	Tier	Index Score™	Trend
1 · rank 1	BioRegen Research San Diego, CA Among the strongest purity results of the 2026 cycle.	Excellent	87/100 BioRegen Research: Index Score 87 out of 100, Excellent	no change
2 · rank 2	Helix Research Supply Miami, FL	Good	79/100 Helix Research Supply: Index Score 79 out of 100, Good	no change
3 · rank 3	Vector Peptide Supply Salt Lake City, UT	Good	70/100 Vector Peptide Supply: Index Score 70 out of 100, Good	no change
4	Atlas Peptide Labs Raleigh, NC	Excellent	85/100 Atlas Peptide Labs: Index Score 85 out of 100, Excellent	no change
5	Research Peptides Co. Denver, CO	Exceptional	90/100 Research Peptides Co.: Index Score 90 out of 100, Exceptional	no change
6	Apex Peptides Austin, TX	Exceptional	91/100 Apex Peptides: Index Score 91 out of 100, Exceptional	no change
7	PureSci Labs Raleigh, NC Most complete manufacturing disclosure we track.	Excellent	89/100 PureSci Labs: Index Score 89 out of 100, Excellent	no change
8	Sterling Compound Co. Nashville, TN	Good	74/100 Sterling Compound Co.: Index Score 74 out of 100, Good	no change
9	Cardinal Metabolic Clinic Columbus, OH	Excellent	87/100 Cardinal Metabolic Clinic: Index Score 87 out of 100, Excellent	no change
10	Halcyon Biosciences Boulder, CO	Excellent	89/100 Halcyon Biosciences: Index Score 89 out of 100, Excellent	no change