Fernet Branca isn't only a digestive bitter, it's a true legend. It's formula is one of the world's best kept secrets, so tightly kept, that since its origin even those who collect the spices do not know the exact quantities needed.
Today, the only custodian of the Fernet-Branca secret formula is the President, Niccolò Branca, who personally measures out the spices during the production process. The recipe is the true pride of Fernet Branca and demonstrates how a century-plus tradition and know-how are the secret to its success. (from the producer)