SAF Instant is easy to use (no proofing or pre-dissolving); it's fast-acting and long-lasting, continuing to work for hours longer than "rapid" yeast. Add directly to the flour or at the start of the kneading process.
Store in an airtight container: for 6 months at room temperature or in the fridge; or for a year or longer in your freezer.
Yeast is a living microorganism. This microscopic fungus is no larger than 6 to 8 thousands of a millimeter in size, yet has exceptional fermentation characteristics.