Bagels are not made with human hair although bagels do often contain an amino acid derived from human hair called L-cysteine.
Human hair is not put directly into bagels but the L-cysteine amino acid that is derived from the human hair is.
The L-cysteine amino acid is added to the dough of the bagels to soften the dough and extend the shelf life of the bagels.
The L-cysteine amino acid can also be derived from duck feathers, animal hair and hog hair although human hair is the most cheapest and potent source of l-cysteine.
Bagels also contain other ingredients like water, flour, yeast, sugar, salt, vegetable shortening, eggs, milk and sometimes honey.
Some bread and pizza dough also contains the L-cysteine from hair.
Bagels are a bread roll that originated in the Jewish communities of Poland and are traditionally made out of yeasted wheat dough which is shaped by hand into a torus or ring, briefly boiled in water and then baked.
It then results in a dense, chewy, dough interior with a browned and sometimes crispy interior.
The thing that sets bagels apart from other bread is it's unique texture and flavor, which comes from its special preparation process.
Bagels are first boiled in water (sometimes with malt syrup or honey added) before being baked, resulting in a crisp and shiny crust that encases a dense and chewy interior.