Where does yeast come from

In this brief guide, we are going to answer the question “Where does yeast come from?” With an in-depth analysis of uses and the storage of the yeast. Moreover, we are going to discuss the shelf life and nutritional value of the yeast.

Where does yeast come from?

Most of the bread yeasts are produced by the different companies but yeast can also be grown in the home. It also grows naturally on various fruits.

Yeast can ferment sugar into alcohol that’s why it is incredibly useful for us.

It is a unicellular organism and it has been used in the baking and brewing industries.

For what purpose yeast is used?

There are several uses of yeast. Some of the uses of yeast are as follows;

Bread making:

Yeast has been used in making bread as it helps in leavening and rising the bread by mixing with the oxygen.

Production of alcoholic drinks:

Yeast is also used in fermentation to produce alcohol. In this way,  manufacturers use different types of yeast to produce wine, spirit etc.

Production of non_alcholic drinks:

In some soft drinks yeast is added to get the flavour however, the fermentation process is stopped earlier to convert the drink into alcohol.

Such drinks are non_alcoholic and sweeter than alcoholic drinks.


Yeast has also been useful in the production of fuel biofuel as it can turn the sugar into ethanol which can substitute the diesel.


Yeast is also used in the formation of probiotics. It has been used by le due to the low amount of protein and vitamins in a normal diet.

CUse of yeast extract:

Yeast extract is also obtained from the yeast which is then used in a variety of the foods such as marmite and vegemite.

How can you properly store the yeast?

There are different types of yeast such as active dry yeast,  instant yeast and fresh yeast etc which need to be stored differently and properly.

You can store the different varieties of the yeast as follows;

Storage of active dry yeast:

You can store the opened active dry yeast in the fridge by putting it in an airtight container.

However, you can store the unopened packets of this yeast in the pantry.

However, every time you use it,  you must first go through the proofing.

Storage of instant yeast:

You should keep the unopened instant yeast in a cool,  dry place and away from the direct sunlight and moisture.

The opened packet of the instant yeast, however,  should be stored in the fridge or the freezer.

Storage of fresh yeast:

Fresh yeast should be stored in the refrigerator and it lasts for only two weeks in the fridge.

Can yeast be frozen?

Yes!  You can freeze both opened and unopened yeast to increase its shelf life.

You can freeze the dry active yeast and the instant yeast but avoid freezing fresh yeast.

Dry active yeast doesn’t require to be thawed before use but it should undergo proofing to check it.

What is the shelf life of the yeast?

Proper storage of the yeast is necessary to prevent the yeast from going bad.   The shelf life of the yeast, if it has been properly stored,   is as follows;

  • Active dry yeast and the instant yeast,  if kept unopened in the pantry, has a shelf life of 2 years.
  • However,  once you open the dry active yeast and instant yeast, it will last for only four months in the fridge and 6 months in the freezer.
  • The shelf life of the fresh yeast is 2 weeks if it is properly stored in the fridge.  Fresh yeast should not be stored in the pantry.

How to know that yeast has expired?

You can tell that yeast has expired by the proofing.

Toe yeast whether it’s active on not, follow the steps given below;

  • Take ¼ cup of warm water and 1 tablespoon of r.
  • Add the yeast to the lukewarm water and the sugar.
  • Let the mixture sit for at least 10 minutes.
  • The active yeast will bubble up after 10 minutes as compared to the inactive yeast which doesn’t show any reaction.

What is the nutritional value of the yeast?

The nutritional value for 5 grams of the yeast is as follows;

  • Calories: 20
  • Protein: 3 grams
  • Fat: 0 grams
  • Carbs: 2 grams
  • Sugar: 0 grams
  • Fibre: 4% of the Daily Value (DV)
  • Riboflavin (vitamin B2): 246% of the DV
  • Niacin (vitamin B3): 109% of the DV
  • Vitamin B6: 212% of the DV
  • Folate (vitamin B9): 59% of the DV
  • Vitamin B12: 313% of the DV
  • Iron: 2% of the DV
  • Potassium: 2% of the DV

Here are the health benefits of yeast.

Other FAQs about Yeast that you may be interested in.

When was yeast discovered? 

When to add yeast nutrient to cider?

How was yeast made in the old days?


In this brief guide, we answered the question “Where does yeast come from?” With an in-depth analysis of uses and the storage of the yeast. Moreover, we discussed the shelf life and nutritional value of the yeast.