Lavender is a must have roller for nausea and abdominal issues. We use it in a variety of our custom blend rollers. I use it personally for indigestion and heart burn. We blend the oil into fractionated coconut oil and fill our beautiful cobalt blue roller bottles. All of our roller tops are stainless steel. We prefer them over plastic due to plastic breaking down eventually and the effect some citrus oils have on plastic. The stainless steel roller ensures a smooth coverage.