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.
A: Melatonin is an over-the-counter dietary supplement marketed to help induce sleep. Melatonin is commonly used to relieve jet leg, insomnia, and trouble sleeping due to shift-work. Taking melatonin will decrease the time it takes to get to sleep, but will not increase the quality of sleep a person has.