Is it permissible to use bread yeast, whether commercial or homemade, used in sourdough bread?
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1 Answer
Peace be upon you and God's mercy and blessings.
Ayatollah Khamenei (may God protect him):
It is permissible to use yeast (including beer yeast) in food as long as it is not known to be made from intoxicants or contains anything forbidden.
Source: Fiqh al-Wali, on the rulings of food and drinks
Ayatollah Sistani (may God protect him):
Yeast is pure and it is permissible to use it in food in itself.
Source: The Legal Office of His Eminence Sayyid Sistani, may his shadow endure – Lebanon
May you be successful in all good.