Long follicular phase means its taking too long for the follicle in the ovary to develop and grow before it releases mature egg which is Yin

Ilana Stein-Attali R.TCMP R.Ac Master of Science TCM refers to this type of deficiency as being low in the ingredients required to create a finished product.  Think of it as creating a soup, the fire underneath the pot may be adequate, the pot may be the right shape and size, but if one or more of the ingredients is missing to make the hearty soup a finished product you may try to increase the cooking time, which may not work.  The best would be to bring the level of ingre