Rubus idaeus - Raspberry Leaf tea sounds like it should taste yummy. It doesn’t. But that hasn’t stopped it being used for centuries for pregnant mums. Sipping Raspberry leaf tea helps relieve morning sickness, but it is later in the pregnancy that raspberry leaf comes into it’s own. Rasberry leaf is traditionally taken in the last trimester of pregnancy to ‘tonify’ the womb. In fact, it is thought to build up the strength of the myometrium (uterine muscle) which leads to an easier delivery. Two to three cups a day in the last trimester.