Yes and that's because it contains an amino acid called Cysteine Hydrochloride (HCL). This amino acid is refined into L-Cysteine and can be used to process dough. It conditions and reduces the time to mix dough and is used in pizzas, croissants, bagels and a wide range of bakery items.

Dark hair is rich in this amino acid and as it happens there is a uniform, cheap and plentiful supply of this in east Asia. So for many years barbers and hairdressers in Asia have been gaining an income from not only cutting their customers' hair but from also baling it up and selling the sweepings to chemical companies.

China is the world's largest producer of hair and poultry based L-Cysteine.

But Germany also produces the chemical. Their's is petroleum based and is a synthetic chemical.

While many western government food agencies do not mind human hair additives in croissants and pastries other countries do mind. Jews do not view human hair L-Cysteine as kosher and prefer the synthetic product. Moslems also will not eat it. Islamic countries consider it a haram (human body) product. They are not permitted to eat any part of the human body.