Reliv is a dietary supplement available in powder form that claims to safely relieve sluggishness and sleep problems as well as to boost the immune system and help prevent weight gain. While many of the vitamins and minerals in Reliv are generally considered safe, the product does contain L-Methionine, which has the potential to cause side effects.
L-Methionine is an amino acid found in meats and dairy products, a substance that builds proteins in the human body. This amino acid is sometimes used under a physician's supervision to treat acetaminophen poisoning, for which the supplement is safe.
Types of Side Effects
When taken in large amounts or for an extended period of time, L-Methionine sometimes causes vomiting and stomachaches, according to the Physician's Desktop Reference.
Some people are allergic to L-Methionine and develop serious reactions when using the amino acid as a supplement. Symptoms of an allergic reaction to L-Methionine include wheezing, shortness of breath, hives and chest pain.
L-Methionine contains homocysteine, a substance that has been shown to contribute to the onset of heart disease and to cause the growth of tumors, according to RxList.
Because the effects of L-Methionine on fetal development are unknown, avoid using Reliv if you are pregnant or nursing. If you have a history of hardening of the arteries, cancer or genetic MTHFR deficiency, it may not be safe for you to take L-Methionine and subsequently Reliv.