Analysis of information sources in references of the Wikipedia article "سیستئین" in Persian language version.
...ANNEX II LIST OF SUBSTANCES PROHIBITED IN COSMETIC PRODUCTS...416 Cells, tissues or products of human origin
...L-cysteine hydrochloride or hydrochloride monohydrate. Human hair may not be used as a source for this substance
...L-cysteine hydrochloride or hydrochloride monohydrate. Human hair may not be used as a source for this substance