Boron

Boron is a vital trace mineral, improving the natural ability of the human body to absorb calcium and magnesium, and is required for normal growth. Boron is essential for normal estrogen usage.  If boron occurs in sufficient levels in the soil in which food is grown, the mineral will be in abundance in whole foods, such as apples, grapes, nuts, legumes, and leafy greens. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4712861/

Often overlooked as is a micronutrient and may be indicated in female infertility. See more here.