Plus, some helpful substitutions.

Thats why first checking the best-by date is important.

The taste may weaken; items may dry out, or stale.

A baking powder container

Simply Recipes / Lori Rice

Essentially, it will not be bad or inedible; it just will not be at its best.

Instead, its easy to make your own with some other baking staples.

Mix the ingredients together and store in an airtight container.

You dont have to worry about the substitutions having much of an impact on taste.

Keep it sealed in an airtight container in a dry place at room temperature.

Dont be tempted to keep it in the fridge.

Refrigeration and moisture are the enemy of baking powder, says Salazar.