Royal Sherpa Critical Extraction-Natural Nestin. The raw material of Royal Xueha Oil Soft Capsule is a five-year-old wild female frog in Changbai Mountain, because it takes more than five years of cold and snow to mature. If your estrogen level is low, it can really improve the effect of estrogen secretion after taking it. Nestin in Royal Xueha Oil Soft Capsule has strong activity, which fully acts on female reproductive system, activates ovarian function, nourishes uterus, promotes egg regeneration and makes menstrual blood smooth. Wish you good health.