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What is yeast?

Yeast are single-celled fungi. As fungi, they are related to other fungi that people are more familiar with, including: edible mushrooms available at the supermarket, common baker's yeast used to leaven bread, common brewer's yeast used to ferment beer, molds that ripen blue cheese, and molds that produce antibiotics for medical and veterinary use. Many consider edible yeast and fungi to be as natural as fruits and vegetables.

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What is the history of yeast?

Yeast can be considered man's oldest industrial microorganism. It is likely that man used yeast before the development of a written language. Hieroglyphics suggest that the ancient Egyptians were using yeast and the process of fermentation to produce alcoholic beverages and to leaven bread over 5,000 years ago. The biochemical process of fermentation that is responsible for these actions was not understood and undoubtedly looked upon by early man as a mysterious and even magical phenomenon.

It was not until the invention of the microscope, followed by the pioneering scientific work of Louis Pasteur in the late 1860's, that yeast was identified as a living organism and the agent responsible for alcoholic fermentation and dough leavening. Shortly following these discoveries, it became possible to isolate yeast in pure culture form. With the newfound knowledge that yeast was a living organism and the ability to isolate yeast strains in pure culture form, the stage was set for commercial production of baker's that began around the turn of the 20th century.

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What is a probiotic?

Probiotics are “live microorganisms which, when administered in adequate amounts confer a health benefit on the host”. (FAO/WHO, 2001)

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What is boulardii?

Boulardii is a yeast, more precisely Saccharomyces cerevisiae variant boulardii. It belongs to the “family” of bakers and brewers’ yeasts. Saccharomyces cerevisiae var. boulardii comprises well defined characteristics, which make it possible to define it as a specific variant of the Saccharomyces cerevisiae specie. Saccharomyces cerevisiae var. boulardii was discovered in 1923 by Henri BOULARD, who gave it his name. Since that time, it has been studied for its probiotic and antidiarrheic properties. Today, Saccharomyces cerevisiae var. boulardii is the only yeast which corresponds to the probiotic’s definition


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What are the main benefits of boulardii?

Saccharomyces cerevisiae var. boulardii is a probiotic yeast. The general benefits of probiotics are: maintaining intestinal comfort, stimulating the immune system and more. Because it is a yeast, Saccharomyces cerevisiae var. boulardii has no sensitivity to antibiotics. That is why it is much used to complement the antibiotics’ treatments, in particular to reduce the Antibiotic Associated Diarrheas (AAD).

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What is the interest of selenium-enriched yeast?

Selenium is a trace element that plays a key role in the human body. It has to be absorb through food. Selenium is metabolized by yeast in competition with sulfur and is thus part of the yeast proteins. According to a scientific opinion from EFSA, the bioavaibility of selenium from selenium-enriched yeast appears to be similar to that of selenomethionine and is approximately twice higher than in the inorganic forms of selenium. Lesaffre selenium-enriched yeast got a positive opinion from EFSA.


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What is primary-grown nutritional yeast?

Primary-grown yeast is cultivated expressly for its nutritional components, rather than being the by-product of another industry such as brewing. Lesaffre derives its primary-grown nutritional yeast from pure strains of Saccharomyces cerevisiae grown on a purified nutrient source designed specifically for yeast. After the fermentation process is complete, the yeast is harvested, thoroughly washed, pasteurized and dried on roller drum dryers. The special growth medium and unique drying process are the secrets to the exceptional performance and flavor of Lesaffre Nutritional Yeast.

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What are the benefits of primary-grown nutritional yeast?

Lesaffre primary-grown nutritional yeast is an excellent source of protein, containing an average of 50% protein by weight. Its amino acid profile is complementary to that of grains and legumes such as corn, wheat and soy. In addition, Lesaffre Nutritional Yeast is a rich source of dietary fiber and contains a wealth of vitamins and minerals, particularly the B vitamins. And since Lesaffre Nutritional Yeast tastes great, you'll enjoy adding it to your favorite meals, drinks and snacks.
In addition, Lesaffre Nutritional Yeast contains other beneficial components, such as beta-1,3 glucan and mannan, complex carbohydrates known to improve the immune response and help maintain cholesterol levels that are already within a healthy range; trehalose, a disaccharide that helps maintain the health of brain cells; and glutathione, an antioxidant that plays an important role in cellular defense mechanisms.* Lesaffre Nutritional Yeast contains approximately 2.5 mg. of glutathione per gram of yeast.

Nutritional yeast is a "perfect food," packed with nutrition, yet naturally low in fat and salt. Lesaffre Nutritional Yeast contains no added preservatives, flavors or colors and is naturally gluten-free.

Primary Benefits:

  • A "super" food, providing nutrition and enhancing flavor in your favorite meals, drinks and snacks.
  • An excellent source of protein, containing essential and non-essential amino acids.
  • Rich in B-complex vitamins, which are important for energy production.
  • A natural source of additional beneficial components, such as beta-1,3 glucan and mannan, trehalose and glutathione.
  • Naturally low in fat and salt, with no added preservatives, flavors or colors
  • Kosher certified (excluding Passover).
  • Naturally gluten-free.


* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

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Why is primary-grown nutritional yeast different?

Primary-grown nutritional yeast is the perfect choice for anyone looking for a natural way to increase their intake of nutrients. Primary-grown nutritional yeast has a superior nutritional profile and is less processed than yeast that has been recovered as a by-product of other industries, such as brewing.

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Is Lesaffre Nutritional Yeast the same as other industrial yeast?

Lesaffre Nutritional Yeast is NOT brewer's yeast, a by-product of the brewing industry that has an inferior nutritional profile compared to primary-grown yeast and that must be further processed to remove the bitter taste of hops. Many people find that nutritional yeast has a smoother, more "cheesy" taste than brewer's yeast, which tends to be bitter even after processing. Additionally, because nutritional yeast does not come in contact with barley (like brewer's yeast), it is gluten-free and safe for people with Celiac disease.
Nutritional yeast is NOT torula yeast, a by-product of paper mill waste streams obtained by growing Pichia jadinii on wood sugars.
Nutritional yeast is NOT dairy yeast, or whey yeast, which is obtained by growing Kluyveromyces marxianus using cheese whey or whey permeate. Therefore, it is safe for people with dairy allergies.
Nutritional yeast is NOT an active baking or brewing yeast. It is an inactive yeast grown expressly for its nutritional components.
Nutritional yeast is NOT a genetically modified organism (GMO), unlike some yeast that are used in baking and beer and wine production.

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Why buy Lesaffre nutritional yeast?

Lesaffre is a premier manufacturer of primary-grown nutritional yeast products. We have over 50 years of extensive experience in the development and production of nutritional yeast products, and over 150 years of experience manufacturing other types of yeast. Our ongoing commitment to innovation, quality and service has resulted in making Lesaffre the largest manufacturer of yeast products in the world!

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What is the shelf life of nutritional yeast?

Lesaffre Nutritional Yeast is good for 24 months when stored in an airtight container in a cool dry area, away from direct sunlight.

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Can Lesaffre Nutritional Yeast cause a yeast infection?

The type of yeast in Lesaffre Nutritional Yeast, Saccharomyces cerevisiae, is a completely different species than the type that causes yeast infections, Candida albicans. Lesaffre Nutritional Yeast does not and cannot cause yeast infections.

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Is Lesaffre Nutritional Yeast gluten-free?

Lesaffre nutritional yeast is gluten-free.

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Is Lesaffre Nutritional Yeast allergen-free?

Lesaffre nutritional yeast is allergen-free.

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Are Kosher and halal certificates available?

Absolutely. They are available on request.

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Where can I find recipes?

Visit our Lesaffre Recipes section.