Hey bryanna thanks for the advice! I currently take adderall for ADHD symptoms. I have taken this sense June but my issues started in July. I have read that various digestive type disorders will cause the yellow coating. I take a multi-vitamin and I have been tested for B vitamin deficiency inwhich the results were normal. Also as I said I am negative for thrush. I do need to eat healthier and probably could benefit from a B vit complex. I have noticed that this issue is the worst when I feel dry mouth symptoms (can't even spit at times) which improves when I eat or when I am not at work (dusty book warehouse) so I'm not sure if there's an allergic component to it. This has been very confusing and it seems hard to diagnose.