Related by context. Frequent words. (Click for all words.) 65 stress hormones 63 dopamine 63 cortisol 63 serotonin 63 stress hormone cortisol 61 norepinephrine 60 endorphins 58 pheromones 57 hormone 56 progesterone 56 estrogen 56 acetylcholine 55 endorphin 54 neurotransmitter 54 nitric oxide 54 adenosine 54 cortisol levels 54 neurotransmitters 54 BDNF 53 estradiol 52 glutamate 52 melatonin 51 hormones 51 sexual arousal 51 Dopamine 51 GABA 50 hormone estrogen 50 estrogens 49 thyroid hormone 49 arousal 49 histamine 49 amygdala 49 ghrelin 49 pheromone 49 hormonal 49 leptin 48 androgens 48 Serotonin 48 naltrexone 48 secretion 48 brain circuitry 47 gabapentin 47 testosterone 47 adiponectin 46 paroxetine 46 nicotine 46 inhibitory 46 ovulation 46 synaptic 46 lactate 46 Hormone 46 methylphenidate 45 arginine 45 choline 45 opioid 45 neurogenesis 45 cytokines 45 resveratrol 45 topiramate 45 hypothalamus 45 stimuli 45 frontal cortex 44 epinephrine 44 amyloid beta 44 sucrose 44 SSRIs 44 impulsivity 44 valproate 44 pain relieving 44 fluoxetine 43 Melatonin 43 antidepressant 43 functional magnetic resonance 43 IgE 43 physiological 43 nitrite 43 GDNF 43 capsaicin 43 glutathione 43 breast milk 43 stimulation 43 interleukin 43 antidepressants 43 prefrontal cortex 43 opioids 43 vagus nerve 43 androgen 43 fMRI 42 VEGF 42 astrocytes 42 cognition 42 striatum 42 rapamycin 42 fatty acid 42 anti depressant 42 insulin 42 fatty acids 42 analgesic 42 glucose metabolism 42 synapses 42 neurons