Decreased appetite is expected
References National Center for Biotechnology Information
Alcohol enters this same system and competes for metabolic processing
(At the time of writing, the FDA still hasnt approved piracetam for use in supplements or as a prescription medication, though many still take it.)3 Nootropics also technically include prescription medications like Adderall (amphetamine salt), Vyvanse (lisdexamfetamine), and Ritalin (methylphenidate),62 as well as medications for dementia and Alzheimers disease (such as memantine).63 Caffeine is also a nootropic substance and an ingredient youll find in many nootropic supplements
But any time a review makes a statement of fact, like potent effects on GLP-1 activity, its always important to dig up the original studies, the so-called primary literature
If there is any doubt, do not use the product