That's because they are sulfur-containing amino acids
Abstracts from the 83rd Scientific Sessions of the American Diabetes Association
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[Ingredients] Mixed preparation (yeast extract (Indian product), lecithin, citric acid), pullulan, pectin, enzyme-treated stevia, steviol glycosides, flavoring (lemon flavor), glycerin, amide pectin, polysorbate 80, milk thistle extract powder (American product) ), L-cysteine hydrochloride, nicotinic acid amide, vitamin B6 hydrochloride, vitamin B12 mixed preparation (dextrin, trisodium citrate, citric acid, vitamin B12), vitamin C, dried yeast (contains selenium, made in Canada), elastin (made in France), Gardenia yellow pigment, collagen (made in India), hyaluronic acid (made in Korea)