Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
testosterone estrogen level male female low hormone therapy age balance science decrease menopause woman cycle health sexual human increase high man graphic illustration chart decline fertility anatomy body diagram loss chemistry vector silhouette physiology sex infographic women period gynecology menstruation fertilization oestrogen uterus education chemical girl biochemistry hormonal stage testosteron