About how to build up immune system was not answered. please answer.

Health and Balance: The best way to optimize immune function is to - reduce immune system stress - avoidance of toxic exposures like mold, food allergies (gluten perhaps), fried foods, sugar, excess carbs, soy, and other edible garbage - strive for metabolic balance - using diet and metabolically directed supplementation (and possibly bhrt) to balance autonomic nervous system, immune system and hormonal system.