Fact-Checked The new data showed a correlation between regular use of probiotics, omega-3 fatty acids, multivitamins, and vitamin D supplements and a lower rate of testing positive for COVID-19. Marc Tran/Stocksy Regular use of certain vitamins and supplements may correlate with a lower risk of COVID-19 in women, according to a new study. The recent data found a lower rate of infection with COVID-19 among women who used multivitamins, probiotics, omega-3 fatty acids, and vitamin D supplements. On the other hand, use of vitamin C, zinc, and garlic supplements showed no effect in lessening COVID-19 risk. None of the supplements were linked to a protective effect against COVID-19 in men.