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The Role of Intermolecular Interactions on the Encapsulation of Human Insulin Into the Chitosan and Cholesterol-Grafted Chitosan Polymers

Harvard Health puts the related point bluntly: placebo effects can ease symptoms like pain, fatigue and nausea, but they do not shrink tumours or lower cholesterol

Antiobesity effects of the beta-cell hormone amylin in diet-induced obese rats: effects on food intake, body weight, composition, energy expenditure, and gene expression

Doing so can increase discomfort, swelling, or infection at the injection site

In short, its because of convenience

Check 2: Confirm your prescribed dose