A reader asked about L-Cysteine not being listed on labels. VRG Researcher Jeanne Yacoubou replied: L-cysteine can in certain situations be in products without it being listed on a label. This is the case, for example, in some prepackaged kits, such as pizza. The premade dough may have L-cysteine but it doesn’t have to be labeled since it’s not part of the finished product. This, and other similar products, could be other likely places for unlabeled L-cysteine.
L-cysteine may also serve as a reaction flavor which is used to make other flavors. Only the latter are in the final product and so only they need to be labeled.
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The contents of our website and our other publications, including Vegetarian Journal, are not intended to provide personal medical advice. Medical advice should be obtained from a qualified health professional. We often depend on product and ingredient information from company statements. It is impossible to be 100% sure about a statement, info can change, people have different views, and mistakes can be made. Please use your best judgment about whether a product is suitable for you. To be sure, do further research or confirmation on your own.