Related by context. Frequent words. (Click for all words.) 52 digestive tract 50 uric acid 49 mucus 49 gastrointestinal tract 49 histamine 48 digestive 47 digestion 47 acid reflux 47 esophagus 47 nitric oxide 46 cortisol 46 glutathione 46 bacteria 46 intestinal tract 46 stress hormones 45 thyroid hormone 45 calcium 45 GI tract 45 acetylcholine 44 toxins 44 intestines 44 glutamate 44 salivary glands 44 serotonin 44 mucous membranes 44 estrogen 44 bloodstream 43 immune cells 42 secretions 42 tooth enamel 42 enzyme 42 microorganisms 42 dopamine 42 norepinephrine 42 chloride 42 reflux 42 UV rays 42 ultraviolet light 42 mucous 42 UV light 42 macrophages 42 ultraviolet rays 41 blood vessels 41 intestine 41 nasal passages 41 IgE 41 adrenal glands 41 GERD 41 malaria parasite 41 excrete 41 acid 41 bladder 41 acidic 41 H. pylori 41 electrolyte 41 pathogenic bacteria 41 lactic acid 41 metabolized 41 acids 41 tryptophan 41 artery walls 40 Melatonin 40 melatonin 40 respiratory tract 40 bacterium 40 toxin 40 thyroid gland 40 metabolize 40 micro organisms 40 gingivitis 40 enzymes 39 secretion 39 saliva 39 epithelial cells 39 cytokines 39 allergic reactions 39 hydrogen sulfide 39 harmful bacteria 39 malignant cells 39 insulin 39 vitamin C 39 sweat glands 39 harmful substances 39 proton pump inhibitors 39 clot 39 arginine 39 spicy foods 39 intestinal 38 inflammation 38 glucose 38 nutrients 38 Vitamin C 38 sulfate 38 antibodies 38 endorphins 38 pancreas 38 progesterone 38 fatty deposits 38 nitrite 38 biofilms 38 sinuses