Gray hair is a natural part of the aging process, occurring as your body produces less melanin, the pigment that gives your hair its color. After age 30, your chances of developing gray hair increases 10 percent to 20 percent every decade. Magnesium deficiency isn't a cause of gray hair, however, and gray hair isn't a symptom of low magnesium levels.
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Magnesium and Your Body
An essential mineral, magnesium helps with more than 300 different chemical reactions in your body, including nerve and muscle functions. It's also crucial for a strong skeletal system, the maintenance of heartbeat, the regulation of blood sugar levels and healthy maintenance of your immune system. The recommended daily intake of magnesium is from 310 to 320 milligrams for adult women but is 350 to 400 milligrams for pregnant women and 310 to 360 milligrams for breastfeeding women. For men, the recommendation is 400 to 420 milligrams per day.
Symptoms of Deficiency
While a magnesium deficiency is rare, if you lack magnesium, the first signs of a deficiency include excitability, weakened muscles and tiredness. Other early symptoms include apathy, confusion, irritability, insomnia, memory loss or trouble retaining or learning new information, confusion and lowered appetite. If you continue to suffer from low magnesium levels, you may develop changes in your cardiovascular system, namely a quicker heart rate. In cases of severe deficiency, delirium and delusions may occur, as well as muscle contractions, numbness and tingling.
Dietary Sources of Magnesium
The majority of dietary magnesium comes from vegetables, especially dark, leafy greens, such as spinach, kale or collards. Other good sources of magnesium include avocados, bananas and dried apricots -- the dried fruits are higher in magnesium than the fresh ones -- and nuts, such as almonds and cashews. Legumes, seeds, whole grains and soy products are also rich in magnesium.
In addition to age, your hair can turn gray as a result of other factors. Genetic predisposition — if your parents had gray hair early, you will likely develop gray hair at an earlier age — as well as hormones can play a role. External conditions, such as pollutants or toxins in your environment, the general climate and exposure to chemicals can also amplify the rate of graying. While you can't prevent hair from turning gray through diet — as you age, it will naturally lose its color — some mineral deficiencies can lead to gray hair. Scientists publishing in “Biological Trace Element Research” in April 2012 found that low copper levels appeared to contribute to premature graying. The study involved teenagers in Iran who experienced early graying, and the researchers state that further research is necessary, because the results aren't conclusive.