Description
"Cysteine" is a semi-essential amino acid synthesized in the liver from methionine and serine, naturally found in high-protein foods like poultry, eggs, and dairy. As a precursor to glutathione, it regulates antioxidant activity, supporting detoxification and oxidative balance. This amino acid also assists in protein formation, aiding collagen production and connective tissue integrity. It further contributes to metabolic pathways involved in fat and carbohydrate utilization. Fundamental to cellular repair, cysteine remains integral to tissue maintenance and physiological resilience.
Functions in the Body
Category
Deficiency Symptoms
A deficiency in cysteine may lead to symptoms like pigment loss in hair, apathy, lethargy, muscle weakness, edema, muscle loss, and impaired growth.
Synergists & Antagonists
Cysteine works synergistically with glutamine and glycine to produce glutathione, a powerful antioxidant that supports detoxification and cellular health. There are no significant antagonistic interactions, but caution is advised when taken with immunosuppressants.
Cysteine
Warnings
Cysteine may interact with immunosuppressant medications, potentially affecting their efficacy. Consult a healthcare provider if you are on such medications.
Food Sources
Cysteine is found in a variety of foods, including nutritional yeast, pork, beef, chicken, fish, lentils, oats, eggs, sunflower seeds, and cheese.
Time Frame
Cysteine can be taken anytime, either through diet or supplements.
Depleted By
Cysteine levels may be depleted by L-dopa and tyrosine supplementation.