Anointing certain acupuncture points in the body using  Clary Sage is shown to increase oxytocin levels (1). This hormone of love and bonding, flowing naturally during physiological labour, is produced in the hypothalamus and released by the posterior pituitary. Clary Sage’s oestrogenic action on the system results from pituitary-gonadal stimulation, likely exerting a regulating action on the pituitary gland (2). Clary Sage is a uterine stimulant and relaxant (3).
 
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References from above numbers:
Clary Sage, shown to increase oxytocin levels HERE
Holmes suggests Clary Sage’s oestrogenic action on the system results from pituitary-gonadal stimulation, likely exerting a regulating action on the pituitary gland. “The Complete Guide to Aromatherapy”, Edtn 2, Salvatore Battaglia, p 188.
Clary Sage is a uterine stimulant and relaxant. “The Complete Guide to Aromatherapy”, Edtn 2, Salvatore Battaglia, p 188.