L-cystine

Table of Contents

Other names

Dimer of L-Cysteine
Cystine Supplement
L-Cystine Tablets or Powder

Synopsis

L-Cystine is a dipeptide formed by the oxidation of two molecules of L-cysteine. It is a sulfur-containing amino acid that plays a key role in the formation of proteins and is important for maintaining the structure and function of various tissues, particularly skin, hair, and nails. L-cystine is primarily known for its antioxidant properties, contributing to detoxification processes and protecting cells from oxidative stress.

L-cystine is important for the synthesis of keratin, a protein that makes up hair, skin, and nails, helping to strengthen and repair these tissues. Its sulfur content is critical for disulfide bonds, which stabilize the structure of proteins. L-cystine also supports detoxification by promoting the production of glutathione, a powerful antioxidant that helps neutralize free radicals and reduce inflammation.

As a precursor to L-cysteine, L-cystine also plays a role in immune function and detoxification. It is sometimes used in supplements aimed at promoting healthy skin, hair, and nail growth, as well as supporting detoxification and liver health.

Historical Use
L-cystine was first recognized in the 19th century as a component of protein structures due to its involvement in sulfur-containing disulfide bonds. While it was not specifically used in traditional herbal or folk medicine, the dietary sources of L-cystine, such as meat, eggs, and dairy, have long been regarded as beneficial for strengthening and nourishing the skin and hair.

In modern times, L-cystine has gained popularity as a supplement for skin health, hair growth, and nail strength. It is often included in products designed to support collagen production, improve wound healing, and enhance protein synthesis.

L-cystine's role in glutathione production also brings attention to its use for detoxification and liver support, particularly in combination with other antioxidants.

Modern Use
Today, L-cystine is commonly found in health supplements designed to support hair, skin, and nail health, as well as in detoxification formulas. Some of its most common uses include:

  • Hair, skin, and nails: L-cystine is used in beauty supplements aimed at improving hair strength, nail growth, and skin elasticity due to its role in keratin synthesis and disulfide bond formation.
  • Antioxidant support: L-cystine helps protect the body from oxidative stress by supporting the production of glutathione, which neutralizes free radicals and supports immune function.
  • Detoxification: L-cystine aids in the detoxification of heavy metals and toxins, promoting liver health and the removal of harmful substances from the body.
  • Wound healing: L-cystine’s role in protein synthesis and collagen formation makes it useful in promoting tissue repair and wound healing.

L-cystine is often found in capsules, tablets, or powdered supplements and is sometimes combined with other amino acids like L-cysteine, glutathione, and vitamin C for enhanced antioxidant and detoxification benefits.

Safety Considerations
L-cystine is generally considered safe when used appropriately in supplements, though excessive intake may cause gastrointestinal discomfort or nausea. As with any supplement, it is advisable to consult with a healthcare provider, especially for individuals with liver issues, or those who are pregnant or nursing. High doses of L-cystine should be avoided, as it could lead to sulfur accumulation and potential toxicity.

Uses: Health Conditions

None

Body Systems

Hair (Science)
Immune System (Science)
Mitochondria (Science)
Nails (Science)
Skin (Science)