Autolyzed yeast extract derives from brewer's yeast that undergoes autolysis, or self-lysis, to break down into its constituent peptides and amino acids. Hot water then extracts the autolyzed yeast products. To concentrate the extract, processors evaporate off the water as the final step. Autolyzed yeast extract provides a rich, meaty flavor to foods, and may be substituted for monosodium glutamate in processed foods, including soups. Commercial preparations are available.
Riboflavin
Yeast extract spread, made up of autolyzed yeast extract, is a rich source of the B vitamin riboflavin. A 1-teaspoon serving provides 0.86 mg of riboflavin, corresponding to 51 percent of your daily requirement for this vitamin. Riboflavin helps your body produce red blood cells and is critical for growth. It works in concert with other B vitamins in your diet.
Thiamine
The second most abundant nutrient in autolyzed yeast extract is thiamine. Thiamine, or vitamin B-1, is essential in helping your body convert the carbs you consume into fuel. In addition to its role in energy production, thiamine helps maintain optimal nerve cell function and keeps your heart muscle healthy. A single teaspoon of autolyzed yeast extract provides 0.58 mg, or 39 percent of your recommended daily amount, of this B vitamin.
Niacin
Autolyzed yeast extract is rich in niacin, another B vitamin. A 1-teaspoon serving contains 5.82 mg of niacin, supplying 29 percent of your daily need. Niacin functions to keep your nerve cells in good working order and also helps maintain healthy skin. Prescription high-dose niacin can help lower blood cholesterol, notes MedlinePlus.
Folate
Autolyzed yeast extract provides a significant amount of folate with 1 teaspoon supplying 61 micrograms, or 15 percent of your daily requirement. Folate plays a major role in the synthesis of DNA in your cells. It also works together with vitamin B-12 in creating red blood cells. Sufficient dietary folate is especially important if you are pregnant, as low levels of this vitamin correlate to an increased risk of neural tube birth defects.
Other Nutrients
A 1-teaspoon serving of autolyzed yeast extract supplies 9 calories to your diet, with 1 g of carbohydrate and 2 g of protein. This amount of yeast extract provides minor quantities of minerals, with less than 5 percent each of the iron, magnesium, phosphorus, potassium, selenium and zinc you require daily. A teaspoon of yeast extract also contributes 9 percent of your recommended daily limit of sodium.
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