The ongoing COVID-19 (Coronavirus Disease of 2019) pandemic has devastated the human race socially, psychologically, mentally, medically, and economically. It has greatly impacted both developed and developing societies. No region of the earth has been spared of the adverse consequences of the disease. To date, the treatment of the disease has remained ill-defined. Additionally, there are no standard preventive regimens for the disease except for non-pharmacologic interventions and vaccinations. However, several unproven preventive medications are awash in social media including the use of chloroquine, Zinc, Ivermectin, Vitamin D, and so many others as prophylactic agents for COVID-19. This has led to the unregulated/unsupervised self-induced consumption of these unproven medications that may be deleterious to health if taken in excess. Herein is a case of a 24-year-old undergraduate who self-medicated with a high dosage of exogenous Vitamin D for unproven COVID-19 prophylaxis for 2 months. He developed Vitamin D Toxicity (VDT) and manifested with varying clinical (dehydration, hypertension, acute abdomen) and metabolic (hypercalcemia, hypokalemia, alkalosis, hyperphosphatemia, hypoparathyroidism, hypercalciuria, and crystalluria) consequences all related to VDT. However, hypercalcemia was the initiating metabolic disorder for all the clinical and the other metabolic derangements. He was admitted, managed accordingly, and discharged home in good clinical condition. Regulations and public health enlightenment of these unproven medications, including Vitamin D, for COVID-19 prophylaxis, should be prioritized to stem the deleterious effect of these agents. These measures will limit the current pandemic to a viral pandemic rather than a pandemic of drug misuse and overdose.