Sleep Formula By GNC Preventive Nutrition Overview & Drug Interactions

Calcium is a vital nutrient found in various foods such as dairy products, certain vegetables, and many fortified items. Over 99% of the body's calcium is stored in the bones and teeth, predominantly as hydroxyapatite. The remaining calcium circulates in the blood, extracellular fluid, muscles, and other tissues, where it is essential for processes like nerve signaling, muscle contraction, vascular activities, glandular secretion, and maintaining cell membrane and capillary permeability. It also plays critical roles in enzyme reactions, respiration, kidney function, and blood clotting, and is involved in neurotransmitter and hormone release, amino acid uptake, vitamin B12 absorption, and gastrin secretion. Calcium balance changes with age: it is positive during periods of growth, stable in adulthood, and tends to become negative in older age. Calcium loss occurs through feces, urine, sweat, and shedding skin cells. In women, reduced estrogen levels decrease calcium absorption and retention, increase bone turnover, and lead to lower bone mass. Calcium supplements come in various forms, including citrate and carbonate, which differ mainly in their calcium content and absorption rates. Calcium citrate is easily absorbed and can be taken without food, making it suitable for older adults or those with low stomach acid. In contrast, calcium carbonate, which contains a higher percentage of calcium, is best absorbed when taken with meals.

Magnesium is a mineral that is essential for the proper functioning of the body. It plays a role in many important physiological processes, including the contraction and relaxation of muscles, the transmission of nerve impulses, and the regulation of blood pressure. Magnesium is found in a variety of foods, including leafy green vegetables, nuts, and grains, and it is also available as a dietary supplement. There are several different forms of magnesium that are available as supplements, all of which can be used to prevent deficiency. Additionally, magnesium is purported to have several different health benefits, such as improving sleep, reducing muscle cramps, reducing anxiety, and preventing or treating migraines. Although magnesium is essential for health, magnesium-containing foods and supplements can interact with some prescription medications if used at the same time.

Valerian (Valeriana officinalis) is a perennial herb native to Europe and Asia. The plant is known for its strong, distinctive odor and its purported medicinal effects. Valerian contains a number of active compounds, including valerenic acid and valepotriates, which are believed to have a sedative effect on the body and are may to be helpful in the treatment of insomnia and anxiety. Valerian is also believed to have mild tranquilizing and muscle-relaxing properties and may be helpful in the treatment of muscle spasms and other muscle disorders. The root of the valerian plant is most commonly utilized in dietary supplements and is often standardized for valerenic acid content.

German chamomile (Matricaria recutita) is a plant species in the Asteraceae family and is native to Europe and Asia. German chamomile is a popular herbal remedy and is often used in teas, tinctures, and other preparations for its calming and digestive properties. German chamomile has Generally Recognized as Safe (GRAS) status in the United States.

Hops are the female flowers (also known as cones) of the hop plant, Humulus lupulus, and a member of the Cannabaceae family. Hops are native to Europe and are widely cultivated in many parts of the world. Hops have a variety of applications, such as for food flavoring and brewing beer. Hops extract has been used in topical medicinal preparations and as a dietary supplement.

Passionflower (Passiflora incarnata) is a climbing vine with fragrant white and purple flowers that is native to the Americas. It is purported to have a number of potential health benefits, including reducing anxiety and improving sleep. It is thought to work by increasing the levels of GABA (gamma-aminobutyric acid), a neurotransmitter in the brain that helps regulate mood and anxiety. Passionflower may also have mild sedative and muscle-relaxing effects and may be helpful in the treatment of muscle spasms and other muscle disorders. Dietary supplements containing passionflower are generally standardized to contain no less than 1.5% of the flavanoid vitexin.