Do not use if seal or package is broken
Surgery 137 : 4855 Wischmeyer PE, Jayakar D, Williams U, Singleton KD, Riehm J, Bacha EA, Jeevanandam V, Christians U, Serkova N 2003 Single dose of glutamine enhances myocardial tissue metabolism, glutathione content, and improves myocardial function after ischemia-reperfusion injury
It also matters for dosing, since the weight-management brands are sometimes available at higher maximum doses than their diabetes-focused counterparts, which is part of why a provider familiar with both formulations matters more than picking a brand name on your own
That stability hints at a maturing market for the most established research peptides: there are enough vendors in each category that no single vendor's promotion swings the median, and demand patterns are predictable enough that vendors don't need aggressive price-cutting to clear inventory