“It’s the body’s desire to maintain homeostasis (a certain, balanced amount) of calcium levels,” explained Jessica Cording, MS, RD, CDN, a registered dietitian and MBG Collective member.
“This means that 24/7 your body is trying to get back to its baseline,” added dietitian Gabriel Tafur, MS, RD, LDN. Vitamin D increases the absorption of calcium needed to maintain blood levels in a relatively tight range. *
Over the past few decades, researchers have realized that vitamin D causes it in three ways.
First (and central method): Increases intestinal calcium absorption (we take from food, drink and supplements) to shuttle the calcium you get into the bloodstream from these inputs. “The main function of vitamin D in calcium control is to increase the absorption of calcium from the intestines, which is a major source of absorption of most micronutrients,” Tafur explains.
Basically, “when serum calcium levels are low, vitamin D stimulates increased calcium absorption from the intestines so that calcium does not escape from the bones,” * adds Cording. It’s smart like that.
How vitamin D works is a little more complex than eye contact, and research suggests that it interacts with intestinal stem cells, regulating the cells that affect intestinal wall barrier function, and more. *
In addition to these basic intestinal functions, vitamin D can also work to pull calcium from the bones and (along with parathyroid hormone) signals the kidneys to retain calcium. *
Ashley Jordan Ferreira, PhD, RDN, Vice President of Scientific Affairs at MBG, summarizes, “The vitamin D / calcium relationship has been simplified for intestinal absorption. , Calcium homeostasis through a simultaneous process. “*
Ferreira says this vitamin-mineral partnership is crucial because calcium is needed for our entire body cells. “Calcium is the most abundant mineral in the human body. It is the cellular gateway for cellular signaling and communication. In fact, it looks like strong bones, compressed muscles (including your heart!), Nerve impulses, and much more.” *