A white or almost white, crystalline powder, practically insoluble in water and alcohol. it dissolves in dilute solutions of alkali hydroxides. L-Cystine is the amino acid dimer formed when of a pair of L-Cysteine molecules are joined by a disulfide bond through oxidation. L-Cysteine is one of the 20 natural amino acids and, besides methionine, the only one which contains sulfur. WACKER has developed a new production method for L-Cystine via fermentation from non-animal and non-human raw materials.

  • CAS No. 56-89-3
  • Empirical formula C6H12N2O4S2
  • Molecular weight 240.30


  • Almost white powder
  • Content min. 98.5 – 101.0%
  • Complies with current Eur.Ph. and FCC specifications
  • Non-GMO microorganisms
  • BSE/TSE-free
  • Certified as kosher and halal
  • Natural according Regulation 1334/2008/EC


All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.

  • Excipient for API synthesis, e.g. expectorants
  • Essential ingredient in cell culture media


Units of 25 kg


FERMOPURE® L-CYSTINE PHARMA has a shelf life of at least 36 months when stored in unbroken original packaging in dry storage areas.

The best use before date of each batch is shown on the product label.

Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)
+1 517 264-8246  (Fax)

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