Hi Anthony and other fellow learners. I unfortunately, the past couple of years have developed a pattern of getting sick (and presently) with an upper respiratory infection about every 3 or 4 months. It typically lasts about 2-3 weeks. I test each time and it’s not influenza or covid. Each time there seems to be a stressful event in my life that happens that leaves me susceptible to infection. I did do a vial of thymosin alpha 1 when i got sick this summer at the onset. I noticed i was still sick for maybe a week and a half but my symptoms were less intense. It seems like every time i get on a decent fitness regimen and am consistent i get sick and it’s a constant setback. Since i am aware of the stressors that precipitate my viral illness it seems to me like my heart rate variability is highly involved in this process. I would like to know what your best advice is Anthony to have a steel like immune system. My system is definitely compromised. I did get an extensive lab work up with a functional medicine doctor about a year ago and nothing but some minor systemic inflammation was found everything else was normal. I’m 46, exercise 3 times a week consistently and have what i would consider an average diet. My sleep isn’t the greatest. My coworkers are even getting concerned about me with how frequent im sick. Supplement regimen includes a quality multivitamin, magnesium, coq10, pqq, urolithan a, dha fish oil, fatty 15, carnosine, vitamin d (my level is optimal) , creatine, taurine. during illness i’ve tried taking high doses of zinc, vitamin d, quercetin but none of those impacts the severity or duration of illness. I’m a pharmacist and definitely not holding anything anyone replies here as medical advice just trying to see what has worked for others! Thank you all so much! Scott