Ingredient information: Cysteine in food supplements
Cysteine, or L-cysteine, is frequently found in dietary supplements. What is it? What are its benefits? Are there any contraindications or precautions for use?
What is cysteine?
Cysteine is a proteinogenic sulfur-containing amino acid (used in protein synthesis). It is abundant in the body and is not considered an essential amino acid. This means that it can be synthesized by the body from its precursors (methionine and serine). It is obtained through diet, and the body is normally able to synthesize it, but under certain conditions, its synthesis is insufficient, particularly in children and the elderly, in which case dietary supplementation becomes necessary. Furthermore, depending on diet and precursor intake, cysteine synthesis may be inadequate.
It is necessary in proteins, particularly for the formation of disulfide bridges.
It is the precursor of cystine.
What are the benefits of cysteine?
Cysteine is generally used as a dietary supplement to address deficiencies related to diet or age. It is also used for its anti-inflammatory properties and to help maintain healthy skin and hair. In particular, it is used in some hair loss medications.
Cysteine is involved in the synthesis of melanin, collagen and keratin, components of skin and/or hair.
Cysteine also plays a role in the defense against oxidants: it is one of the constituents of glutathione, the star of antioxidant defense.
What are the health claims for cysteine?
There is no health claim validated by the EFSA for cysteine.
What are the precautions for use and the side effects of cysteine?
Cysteine may cause nausea and headaches.
Its consumption as a food supplement is not recommended for pregnant or breastfeeding women, who should seek medical advice before use.
Cysteine in Phytocea food supplements
At Phytocea , we have incorporated cysteine into the formula of ReGlow, our special food supplement for nails, skin, and hair. This ensures a sufficient intake for optimal skin, nail, and hair health.
ReGlow is a plant-based and vitamin-based food supplement designed to promote clear skin and maintain the quality of nails and hair, containing a mixture of plants, nutrients, and substances with nutritional or physiological purposes.
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