Related by context. Frequent words. (Click for all words.) 82 oxytocin 78 Oxytocin 67 stress hormones 66 stress hormone cortisol 63 endorphins 62 cortisol 60 vasopressin 60 prolactin 60 serotonin 60 pheromones 58 hormone estrogen 58 hormone 57 Cortisol 57 dopamine 57 endorphin 56 norepinephrine 56 estrogen 56 hormones 56 neurotransmitters 54 nitric oxide 54 sexual arousal 54 hormonal 54 cortisol levels 53 acetylcholine 53 neurochemical 53 progesterone 52 neurotransmitter 52 Dopamine 51 pheromone 51 adenosine 50 Serotonin 50 male hormone testosterone 50 arousal 50 thyroid hormone 49 brain circuitry 49 Hormone 49 thyroid hormones 49 breastmilk 49 prostaglandins 48 melatonin 48 androgens 48 histamine 48 estrogens 48 glutamate 48 genistein 48 ghrelin 48 testosterone 48 secretion 48 BDNF 48 leptin 47 sebum 47 Hormones 47 adiponectin 47 estradiol 47 cytokines 47 ovulation 47 libido 47 arginine 47 GABA 47 nicotine 47 NPY 47 orgasm 46 Melatonin 46 hypothalamus 46 nucleus accumbens 46 prostaglandin 46 capsaicin 46 neural pathways 45 pain relieving 45 signaling molecule 45 collagen 45 secretions 45 breast milk 44 glucocorticoids 44 phytoestrogens 44 physiological 44 orgasms 44 hyaluronic acid 44 vagus nerve 44 lactate 44 neurogenesis 44 signaling molecules 44 sulforaphane 44 Nicotine 44 maternal instinct 44 phenylalanine 44 glutamine 44 astrocytes 44 resveratrol 44 TGF beta 44 hormone insulin 44 Estrogen 43 estrogen receptors 43 flavonoid 43 relieves stress 43 neuroendocrine 43 IgE 43 fatty acids 43 caffeine 43 interleukin 43 glutathione