a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; used as a dusting powder. The inhalation of talc is associated with a wide variety of respiratory disorders.
Factors contributing to poor sleep include vitamin and mineral deficiencies. Magnesium deficiency can cause insomnia; lack of potassium can lead to difficulty staying asleep; and vitamin D deficiency has been linked to excessive daytime sleepiness.
Â· just now. Report Abuse. Well, vitamin D is usually considered a vitamin rather than a hormone, but it functions as a hormone by causing an increase the absorption of calcium in the gastrointestinal tract, as well as influence the deposition and reabsorption of bone.