What is SAF Gold (osmotolerant yeast)?

A red-label instant yeast bred to ferment reliably in high-sugar doughs (>10% baker's percentage sugar) like brioche, challah, panettone, and sweet rolls. Regular instant yeast slows down in sugary doughs; SAF Gold doesn't. Substitutes 1:1 for regular instant. Not required — regular yeast still works, just slower.