Cysteine/NAC (N-acetylcysteine)
What is Cysteine/NAC (N-acetylcysteine)?
L-cysteine is an amino acid that occurs naturally in the proteins of various life forms. N-acetylcysteine (NAC) is a form of L-cysteine preferred for use as a dietary supplement because it is more stable and more easily absorbed.
Sufficient amounts of L-cysteine are usually available through the diet in such high protein foods as cottage cheese, yogurt, various meats, granola and wheat germ. L-cysteine is a nonessential amino acid in healthy individuals because it can be manufactured in the body from methionine (an amino acid).
Health Benefits
L-cysteine is a precursor to the antioxidant glutathione, which is severely depleted in the liver in cases of acetaminophen overdose. The NAC form of L-cysteine is used to counteract these overdoses and replenish glutathione levels.
N-acetylcysteine is hepaprotective, meaning it is beneficial to the liver, and is being researched as a possible compliment to therapy for hepatitis.
L-cysteine may also have anti-inflammatory properties, and is currently being studied as a possible treatment for symptoms of osteoarthritis and rheumatoid arthritis.
Research has shown that NAC may aid in the treatment of adult respiratory illness. Other studies have found that NAC may help prevent cardiovascular disease, may help in the treatment of diabetes, may help those with age associated memory loss, and may fight against some cancers. More research is needed.
Usage Indications
Use as directed. Acetaminophen poisoning is a serious medical emergency and must be treated as soon as possible. L-cysteine or N-acetylcysteine may aggravate kidney stones in rare cases; therefore it is important to drink plenty of water while using either supplement.
L-cysteine is available in capsule, tablet and powder form.
N-acetylcysteine is available by prescription in aerosol spray and liquid form and over-the-counter in topical, caplet and tablet form.
- Side effects: Mild gastrointestinal discomfort or rash may occur in some. May cause headaches, especially in those taking nitrates for the treatment of angina.
- Indications: Children or pregnant/nursing women should not take L-cysteine or N-acetylcysteine, except under the advice of a physician. L-cysteine or NAC supplements are not recommended for those prone to kidney stones.
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Product List for Cysteine |
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