Friendliness

Friendliness

oxytocin

90%

dopamine

80%

serotonin

80%

beta-endorphin

80%

met-enkephalin

75%

leu-enkephalin

75%

anandamide

75%

gaba

70%

alpha-endorphin

65%

gamma-endorphin

65%

norepinephrine

65%

melatonin

60%

beta-neoendorphin

50%

alpha-neoendorphin

45%

dynorphin a (1-17)

40%

dynorphin a (1-13)

40%

dynorphin b

40%