Why do some people have a less difficult time with COVID-19, while others end up in the hospital, fighting for their lives? Why do some escape being infected by the virus altogether? The strength of a person's immune system is one answer. There are simple, logical things we can do to strengthen our immune systems against new diseases like COVID-19. Doctors McComsey and Myers are at the forefront of SARS-CoV-2 research and have written a book that outlines exactly what we all can do. Physicians and scientists have recently discovered a pattern among those experiencing the best COVID-19 outcomes: these people have optimal amounts of two key micronutrients, vitamin D and vitamin K2. While they don't prevent COVID-19, these two vitamins can help your immune system better deal with the disease. Recent studies show that lung damage and thromboembolism, two of the most serious COVID-19 outcomes, have been linked to deficiencies in vitamins D and K2. In Simplifying the COVID Puzzle, the authors simply and clearly explore how vitamins D and K2 act as a low-risk, proactive supplement combination.