What Is HPLC Peptide Purity Testing?
HPLC purity is a chromatogram statistic, not a vial inventory. What 99% actually certifies, what it misses, and what to demand on a US batch COA.
COA and Purity Science
COA and Purity Science
HPLC vs Mass Spectrometry
HPLC measures purity, MS confirms mass — but both share a blind spot. What each method can and cannot certify on a research peptide COA.
COA and Purity Science
How to Read a Peptide COA
A purity percentage is a chromatogram statistic, not a statement of what is in the vial. How to read a peptide COA line by line, and what it omits.
Comparison Guides
CJC-1295 DAC vs No-DAC
CJC-1295 with DAC and CJC-1295 no-DAC are different research compounds, not two strengths of one. What the albumin conjugate changes, and why.
Industry News
Buy Research Peptides USA
A procurement guide for US labs buying research peptides: COA verification, net peptide content, domestic stock, and comparing suppliers honestly.
Industry News
Peptide Sciences Shutdown
Peptide Sciences closed March 6, 2026. What the shutdown signals about US research peptide supply, and how to qualify a domestic replacement supplier.
Comparison Guides
Semaglutide vs Retatrutide
How semaglutide and retatrutide differ at the receptor, what the 2026 rodent data actually show, and how to source either for US laboratory work.
Comparison Guides
Growth Hormone Secretagogues Compared
Ipamorelin, CJC-1295, tesamorelin and GHRP-6 act on two different receptors, not one. A preclinical comparison with US sourcing and COA notes.
Peptide Research
Melanotan 2 Melanocortin Research
Melanotan 2 (MT-II) melanocortin receptor pharmacology, preclinical pigmentation and MC4R data, and what US labs should verify on a COA before sourcing.
Comparison Guides
BPC-157 vs TB-500 Research Compared
BPC-157 vs TB-500 compared on mechanism, model systems and the 2026 head-to-head rat Achilles study — including what the combination arm actually showed.