This Sourdough Starter Dehydrated 100+ Yrs Old San Francisco is a unique and historic product that captures the essence of San Francisco's renowned regional cuisine. With an expiration date of 01/2030, this starter is a timeless addition to any baker's pantry. Made with natural ingredients and free from artificial additives, this yeast and baking agent is perfect for creating authentic sourdough bread with a touch of heritage. Each 15-gram bag contains enough starter to make countless loaves of delicious San Francisco-style sourdough bread.