While some plastics used in syringes are inert, there is a risk of the peptide binding to the plastic over time, which could alter the effective dose
Endoscopy 47 , 409414 (2015)
Easy measuring: At ~3.33 mg/mL, 1 unit 33.3 mcg on a U-100 syringe
Visceral sensitivity and symptoms in patients with constipation- or diarrhea-predominant irritable bowel syndrome (IBS): effect of a low-fat intraduodenal infusion
Although the cigarette smoke exposure method was passive, whole-body exposure, the level of exposure more closely approximates the levels produced by active smoking, and the effects are presumed to be primarily mediated by inhalation
A person with a low sense of reward may be attracted to stimulants, and a person with an overly high sense of reward may present as manic