Vitamin d is important for maintaining a healthy body, primarily because it helps you fully maximize your body’s absorption and utilization of calcium, an important mineral that we all need. when paired with calcium, vitamin d helps regulat. Role Of Vitamin D In Pathogenesis Of Chronic Sinusitis With Live a healthy lifestyle! subscribe to our free newsletters to receive latest health news and alerts to your email inbox. Vitamin effects on the immune system: vitamins a and d take centre stage. nat rev immunol 2008; 8:685–698. norman a. from vitamin d to hormone d: fundamentals of the vitamin d endocrine system essential for good health. am j clin nutr 2008; 88:491s–499s. dusso a, brown a, slatopolsky e. vitamin d. am j physiol renal physiol 2005; 289:f8–f28. According to james c. breneman, m. d. a pioneer in food allergy study, nasal and sinus membranes readily respond to food allergens, becoming swollen and subject to frequent infections. foods commonly cited as causing upper respir...