L-lysine, an essential amino acid, is needed for such bodily processes as energy production and growth. Most people get enough from their diets, but certain people, such as athletes and vegans, may be at risk for a deficiency and need L-lysine supplements. You doctor may also prescribe L-lysine for herpes outbreaks and cold sores. Overdosing on L-lysine can result in certain side effects, but bad dreams are not typically one of them.
L-Lysine Food Sources and Deficiencies
It is possible to meet your needs for L-lysine requirements by eating foods like red meat, pork, cheese, cod, nuts, eggs, tofu, spirulina, beans and dairy products. However, if you do not get enough L-lysine in your diet, you may develop symptoms of a deficiency, including fatigue, nausea, agitation, dizziness, a poor appetite, bloodshot eyes, anemia and reproductive disorders. In this case, your doctor may prescribe supplements of the amino acid. If you suffer from outbreaks of genital herpes or cold sores, taking extra L-lysine may help prevent outbreaks, but more research is needed to determine this conclusively, notes the University of Maryland Medical Center.
Side Effects and Precautions of L-Lysine Supplements
When consumed in appropriate quantities, which your doctor can help you determine, L-lysine is considered safe for most people and does not typically cause adverse side effects. However, taking it in high doses may cause you to develop gallstones or kidney dysfunction. It can also elevate your cholesterol levels, so your doctor may advise you against consuming L-lysine if you have high cholesterol. People with kidney or liver disease or women who are pregnant should not take L-lysine before discussing it with a health care provider. Let your doctor know about other medications and supplements you are taking, because they may interact with L-lysine.
Potential Causes of Bad Dreams
While L-lysine is not known to cause bad dreams, many medications and supplements can cause nightmares. These include antidepressants, barbiturates, narcotics and beta blockers, among others. Using illegal drugs or drinking alcohol can lead to bad dreams as well, as can stress, trauma and having an illness. For some people, eating right before bed can trigger nightmares, and watching a frightening film or reading a scary book can cause a bad dream, too. If your bad dreams are consistently disrupting your sleep, or if you believe your medications or supplements may be causing them, seek medical attention.
Additional Considerations
See your doctor if you develop any unusual side effects while taking L-lysine, including those not typically associated with the supplement. Never begin taking new supplements or making dietary changes without first consulting with your doctor. Also keep in mind that a diet high in the amino acid L-arginine or taking supplements that contain it may decrease the efficacy of L-lysine.
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