Boron is said to potentiate estrogen’s role in building bones by helping convert vitamin D into the active form necessary for the absorption of calcium. Boron is essential to bone metabolism and calcification of bones, and helps prevent osteoporosis, arthritis, and tooth decay. Boron is necessary for cartilage formation and repair; it affects calcium, magnesium, and phosphorus levels. Memory and brain function can be improved with boron. Boron plays a role in regulating the hormones, especially estrogen, but testosterone as well. A boron deficiency can cause weak and fragile cell walls. Some research shows that boron improves libido. Boron is stored in the parathyroid glands.