The number that showed up in almost every story this week: roughly 30% of peptide products fail quality testing. Vanity Fair cited it. Science News referenced it. It's become the go to statistic Figure 4 from Study of pH dependent solubility of organic bases. Revisit of Henderson Hasselbalch relationship. Semantic Scholar What is pH and why is it important? Priva Help Center Polypropylene Imine .Dendrimer Mediated Solubility Enhancement: Effect of pH and Functional Groups of Hydrophobes How to add measured pH dependent solubility profiles to PK Sim? Issue #88 Open Systems Pharmacology Forum The pH Dependence of Niclosamide Solubility, Dissolution, and Morphology Motivates Potentially Universal Mucin Penetrating Nasal and Throat Sprays for COVID19, its Contagious Variants, and Other Respiratory Viral Infections bioRxiv