It is a derivative from the ancient Roman fermented fish sauce. After the Romans "cut and ran" from Britain - the Brits had acquired a taste for it. It has slowly evolved into today's Worcestershire Sauce.
The traditional recipe for Worcestershire sauce includes an unbelievable array of ingredients: anchovies, tamarind, coffee, vinegar, spices, sugar, garlic, onions, apples and a host of other ingredients.
No human hair.
"It is a derivative from the ancient Roman fermented fish sauce."
Yup, garum. It's still around, actually. You can find it in any Italian specialty grocery. Gosh, I like food!