NOW Foods L-Cysteine is a semi-essential amino acid, meaning the body can produce it on its own but may require additional dietary sources under certain conditions. It plays several important roles in the body, including protein synthesis, antioxidant defense, and detoxification.
L-Cysteine is a precursor to the antioxidant glutathione, which is considered one of the body?s most potent antioxidants. Glutathione helps protect cells from oxidative damage caused by free radicals and toxins. L-Cysteine supplementation may help support the body?s production of glutathione, thereby promoting antioxidant defense and overall health.
In addition to its antioxidant properties, L-Cysteine is also involved in the synthesis of other important molecules in the body, such as taurine and coenzyme A. It plays a role in the formation of disulfide bonds in proteins, which are essential for protein structure and stability.
L-Cysteine supplements are sometimes used for various health purposes, including:

Liver health: L-Cysteine may support liver function by promoting detoxification and protecting liver cells from damage.
Respiratory health: L-Cysteine has mucolytic properties, meaning it may help break down mucus and support respiratory health. It?s sometimes used as a supplement for conditions such as chronic bronchitis and cystic fibrosis.
Hair and nail health: L-Cysteine is a component of keratin, a protein that forms the structure of hair, nails, and skin. Some people take L-Cysteine supplements to support the health and growth of hair and nails.

As with any supplement, it?s important to consult with a healthcare professional before starting L-Cysteine or any new supplement, especially if you have any underlying health conditions or are taking medications. They can help you determine if L-Cysteine supplements are appropriate for your individual health needs and advise you on the proper dosage.