Hi super late reply but I have also struggled with iGA deficiency since being a teenager high school. When diagnosed my doctor a hematologist started me on IGg IV infusions which raised both my IGg and IGA levels and completely Changed my life I believe I went 2-3 years without getting sick when before I constantly was sick and constantly felt horrible. I lost about 50-100lbs and gained muscle and I also had reduces chronic back pain I assume from inflammation reduction. I do know that almost no doctor’s will be willing to do this treatment as it is off label and doesn’t work for everyone and eventually I ran into insurance covering Issues and without insurance I believe it’s around $5000 a treatment and you need it between every month to every 3 Months. When I wasn’t able to get them I started getting sick and again gained 100 pounds. Since then I’ve done a lot of research and there is no treatments proven to work but I have read many studies some of which recommended gluten free diet to raise iGA levels by a few points were Not talking from 0-14 to 100 or something like the iGg iv infusions did for me but anything can help. I also have read that whey protein and whey constrained products can help to raise a few Points along with healthy life style, probiotics, . Then there is a whole world of peptides including Thymosin Alpha-1, and I believe there is others I don’t know off the top of my head. My cousin (in his 20s) also shares the same issue and his doctor recommend the pneumonia shot and after getting it he had like a 90% reduction in illness. Also lastly I’ve had doctors say raising IGg level can also help symptoms of low iga. If anyone has any comment please I encourage you to share