The supermarket loaves contain many ingredients including this !!!!
''It is the amino acid L-Cysteine that is used to prolong shelf-life in products and is reported to mainly come from China.
Most of the hair used to make L-Cysteine comes from China, where it is gathered from barbershops and hair salons. ''. Google 'Supermarket bread ingredients' for the full list. You Tube has many simple bread recipes.