Many people are deficient in vitamin D and Omega 3 fatty acids and they both have anti inflammatory and immune system rebuilding properties. (fitnessandpower.com)
If you drink alcohol, you are at an increased risk of being deficient in magnesium, calcium, zinc, and iron. (healthcare-online.org)
Many people are deficient in vitamin D and so have compromised immune function. (joshgitalis.com)