Vitamin A
Vitamin A, also known as retinol or retinoic acid combats infection especially when it comes as a preformed vitamin. Preformed vitamin A can be found in animal foods including fish, meat, or dairy products. This is a fat-soluble vitamin [5] that helps form and maintains healthy teeth, skeletal and soft tissue, mucus membranes, and skin. It is associated with good vision, cell growth, and immune functions. Vegetarians can source this vitamin from plant carotenoids found in vegetables like carrots, sweet potatoes, pumpkins, butternut squash, cantaloupe, and dark green leafy vegetables.