Visible particles, cloudiness, or sediment at the bottom of the bottle
Barnes BJ and Hollands JM Drug-induced arrhythmias. Crit Care Med 38 (2010): S188-197
That's marketing, not science
This metabolite has been shown to deplete glutathione, induce oxidative stress, and cause mitochondrial injury, even in the absence of hepatic toxicity
This concept eventually led to drugs like sitagliptin (approved 2006), but those would generally have less potent effects than direct GLP-1 agonists since GLP-1 levels only double or triple on DPP-4 inhibitors (and those drugs rely on some residual pancreatic function and meal stimulation) ( [59] )
While it may be available in select online retailers, buying directly from the official source is recommended to avoid counterfeit or expired products