FDA has oversight for the integrity and safety of the drugs (called Active Pharmaceutical Ingredients, or APIs, by FDA) used in compounded preparations
In summary, store ascorbic acid (Vitamin C) injection in the refrigerator, protect it from light and freezing, and observe the 28-day use window after opening
The FDA has issued safety communications regarding compounded GLP-1 receptor agonists, including tirzepatide and semaglutide, warning about adverse events from bacterial contamination, incorrect dosing, and use of improper ingredients
Do not eat close to bedtime
PubMed, Hammond, Emily E., et al