Melatonin

The Basics

Melatonin is the only hormone that is secreted into the bloodstream by the pineal gland (located in the brain). This multi-purpose hormone regulates other hormones responsible for circadian rhythm (the body's rhythm during a 24-hour period of time - i.e. eating, sleeping). In addition, the release of female reproductive hormones, menarche, menstrual cycles, and menopause are all affected by melatonin.

Melatonin's antioxidant properties (anti-aging) make it an extremely efficient free radical scavenger. Not only can this hormone invade any cell, it is capable of protecting the nucleus (contains DNA). Glutathione peroxidase, another antioxidant, is stimulated by melatonin.

Since this hormone has the ability to affect sleep patterns, people use melatonin to treat jet lag and insomnia. Seasonal depression has been treated with melatonin. The effectiveness of certain drugs (i.e. interferon, interleukin-2) used to treat some cancers (breast, prostate) is enhanced, while the side effects are lessened.

Additionally, melatonin may prove helpful in the treatment of multiple sclerosis, epilepsy, sudden infant death syndrome (SIDS), osteoporosis, and heart disease.

Sources

There are no food sources for melatonin. It is available in tablet, capsule, and sublingual tablet forms.

Guidelines and Cautions

A required dietary allowance (RDA) has not been established. Sensitivity to melatonin varies. Although there are no known serious side effects, some people experience vivid dreams or nightmares. If melatonin is not used properly, circadian rhythms may be disrupted.

Some sources suggest the following:

To treat jet lag: at destination, take 5-mg of melatonin one hour before bedtime. Continue for five days.

To treat insomnia: 3-mg one hour before bedtime. Depending upon individual sensitivity to melatonin, the dose may be adjusted down to 0.1-mg and as high as 6-mg.

People who have lupus, rheumatoid arthritis, lymphoma, leukemia, or depression should only take melatonin under the direction of a medical professional.

There are possible interactions. Even some vitamins, such as B12, B6, and niacinamide can affect the production of melatonin (increase/decrease). Certain nonsteroidal anti-inflammatory drugs (i.e. aspirin, ibuprofen) reduce melatonin levels and may affect sleep if taken at bedtime. Other drugs that interfere with melatonin production are Valium, Xanax, diuretics, beta-blockers, calcium channel blockers, and alcohol and caffeine.

If currently under treatment for a disorder, or if taking medication on a regular basis, consult with a medical professional prior to taking melatonin.