Study hints that supplements may reduce COVID-19 risk in females Written by James Kingsland on December 10, 2020 — Fact checked by Jessica Beake, Ph.D. The research found small but significant decreases in the risk of SARS-CoV-2 infection among females — but not males — who took multivitamins, vitamin D, omega-3 fatty acids, or probiotics. Noel Hendrickson/Getty Images. All data and statistics are based on publicly available data at the time of publication. Some information may be out of date. for the most recent information on the COVID-19 pandemic. Researchers at King’s College London, in the United Kingdom, analyzed data from 1.4 million users of the COVID Symptom Study app in the U.K., the United States, and Sweden. The participants answered questions about their regular use of dietary supplements.