This is a recurring theme in research-chemical quality: the label is not the molecule, and conclusions drawn from an uncharacterized preparation carry a large asterisk regardless of how careful the downstream experiment is
Science 284:309313 Dhitavat S, Ortiz D, Shea TB, Rivera ER (2002) Acetyl-L-carnitine protects against amyloid-beta neurotoxicity: roles of oxidative buffering and ATP levels
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In patients with type 2 diabetes, semaglutide prescription was associated with 0.13% risk of first-time suicidal ideations and 10% for recurrent ideation, compared to 0.36% and 18%, respectively, for other diabetes medications