Related by context. Frequent words. (Click for all words.) 48 neurotransmitter 46 neurotransmitters 46 secretion 45 dopamine 44 glutamate 44 serotonin 43 hypothalamus 42 hormone 41 norepinephrine 41 hormones 40 cytokines 39 GABA 39 Hormones 39 nerve cells 39 endorphins 38 progesterone 37 bloodstream 37 stress hormones 37 neurons 37 neuron 36 electrical impulses 36 hormonal 36 cortisol 36 oxytocin 35 nitric oxide 35 pheromone 35 overactive 35 receptors 35 induces 35 nerve endings 35 stimulates 34 melatonin 34 pheromones 34 estrogen 34 collagen 34 glands 34 stimulation 33 ghrelin 33 arousal 32 leptin 32 testosterone 32 Hormone 31 stimuli 31 electrical stimulation 31 immune cells 31 uric acid 31 synapses 30 hair follicles 30 Testosterone 30 Nicotine 29 stimulant 29 neural 29 amygdala 29 sensations 29 nicotine 28 mucus 28 physiological 28 orgasm 27 toxins 27 muscles 26 insulin 26 metabolism 26 libido 26 orgasms 26 anti inflammatory 26 epinephrine 25 metabolic 25 Adrenaline 24 satiety 24 physiologically 24 lactic acid 24 capsaicin 23 resveratrol 23 flavonoids 21 stomach acid 20 Caffeine 20 detoxify 19 digestion 18 caffeine 18 belly fat 17 adrenalin 17 adrenaline 17 pleasurable 16 burning sensation 16 antioxidants 15 cravings 15 aerobic exercise 14 stress 14 aerobic 13 euphoric 12 scientifically proven 12 exertion 12 drowsiness 11 physical exertion 11 relieve stress 11 aroma 11 peppermint 10 stressful situations 9 sleeplessness 8 adrenaline rush 5 alertness