Since up to a third of people are deficient in vitamin C, it can be important to supplement, but the type absolutely matters! (wellnessmama.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 Omega 3 fatty acids and they both have anti inflammatory and immune system rebuilding properties. (fitnessandpower.com)