Which physiological processes does boron accomplish in the body? What are symptoms of a deficiency? Which mineral does it work with?
There is evidence that boron is essential for health."Substantial evidence exists for boron being a bioactive food component that is beneficial, if not required for bone growth and maintenance, immune function, psychomotor skills, and cognitive function."
In bone, boron "works" with the other minerals that are essential for bone health, such as: calcium, magnesium and zinc.
Boron supplements, following a boron depletion diet, appear to have effects on serum calcium levels, urinary calcium and magnesium levels, and serum 17-beta-estradiol and testosterone levels. See the second reference below.
Best wishes and good luck.
Boron as an element is widely present in soil and water, and may be an essential mineral for animals and humans. The dietary intake of boron is about 1 or 2 mg per day. Boron has the potential to influence a number of metabolic processes. Boronated compounds have been shown to be potent anti-osteoporotic, anti-inflammatory, hypolipemic, anti-coagulant and anti-neoplastic agents both in vitro and in vivo in animals.
Since an absolute requirement for boron has not been definitively demonstrated in animals and humans, there are no known deficiency symptoms.
Since boron helps to build strong bones, it probably works well with calcium and phosphorus.