Uncommon and rare adverse effects include cystitis, folliculitis, gastrointestinal infections, hypersensitivity reactions, changes in appetite, depression, insomnia, balance disorders, lethargy, restless leg syndrome, syncope, photophobia, presbyopia, tinnitus, confusion, palpitations, hypertension, hypercholesterolaemia, and weight gain
Some people may experience side effects like stomach pain and diarrhea when taking more than 9 g per day
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The FDA has not reviewed safety data, efficacy data, or quality control standards for these mixed formulations