SwansonNAC N-acetylcysteine

NAC is a stabilized form of the amino acid cysteine, in which an acetyl group is added. This form is highly soluble in water and is often used in supplements due to its stability and purity.

Cysteine is an amino acid that is part of proteins. NAC is a modified form in which an acetyl group is attached to the molecule. This modification results in a different chemical structure, which is why NAC is more often used in supplements.

N-acetyl L-cysteine is a form that the body can use to produce cysteine. Compared to regular cysteine, NAC is usually more stable and easier to process in supplements.

Cysteine is found in protein-rich foods such as meat, fish, eggs, dairy products, legumes, nuts, and seeds. It is one of the sulfur-containing amino acids present in animal and plant proteins.

This means that cysteine contains sulfur as part of its chemical structure, which distinguishes it from many other amino acids.