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Summary: nutritional yeast is flakes of inactive Saccharomyces cerevisiae with about 45-50 g of protein per 100 g, fibre and B vitamins; you sprinkle it on food (1-2 tablespoons a day, 5-15 g). Yeast protein is a different product: a powder isolate with over 70 g of protein per 100 g, taken in shakes (25-30 g per serving). Both are vegan.
Yeast protein is an inactive superfood derived from the fungus Saccharomyces cerevisiae, recognized for its high protein content, its fiber and its practical powder format. If you are looking for a vegan source of protein, it is an option worth considering.
"Nutritional yeast" and "yeast protein" are easy to mix up. The first is flakes for seasoning; the second is a protein isolate in powder form. Here are both, and what sets them apart.
What Is Nutritional Yeast and What Is Yeast Protein?
What is nutritional yeast?
It is Saccharomyces cerevisiae yeast grown to be eaten, deactivated with heat and dried into flakes or powder. It does not make dough rise and does not ferment. It provides mostly protein (around 45-50 g per 100 g), fibre and B vitamins; B12 only if it is fortified. It tastes of cheese and nuts.
What is the difference between nutritional yeast and yeast protein?
Nutritional yeast is the whole yeast in flakes. Yeast protein is an isolate: the protein is extracted from that yeast and concentrated to over 70 g per 100 g, with less fibre and a more neutral taste. The first seasons food; the second goes into shakes as an alternative to whey.
Yeast protein
Yeast protein is a strain of yeast grown in sugary media exclusively for use as a food supplement. Unlike other variants, it is sold inactive, dry and in powder form, with 100% solubility for drinks.
Fermentation and inactivation process
The process consists of growing the fungus for several days in a glucose-rich medium, usually cane or beet molasses. Once it reaches the desired volume, it is harvested and carefully washed.
The key step is heat treatment. The fungus is exposed to high temperatures to fully deactivate it, preventing any future fermentation. Finally, it is dried and transformed into powder for packaging.
What else is nutritional yeast called?
It is also known as deactivated yeast or yeast flakes, and as nooch. It is not the same as brewer's yeast, not even the debittered kind, nor as baker's yeast, which is alive and makes dough rise.
Compared with baker's yeast, the main difference is its biological state: baker's yeast is alive and active, while nutritional yeast and yeast protein are inactive.
If you try to make bread with this inactive version, the dough will not rise because there is no carbon dioxide production. Its use is strictly nutritional, designed to enrich shakes and drinks without altering the chemical structure of foods.
Properties and nutritional value per 100g
Yeast protein stands out as a plant-based protein and is low in fat.
Essential amino acids: leucine and lysine
Yeast protein provides essential amino acids, the ones the body cannot make on its own: 6.8 g of leucine and 6.9 g of lysine per 100 g.
Protein contributes to the maintenance and growth of muscle mass, including when you train hard.
To work out how much protein you need, see what protein is for, and if you prefer food, here are the high-protein foods.
Yeast protein: values per 100 g
| Nutrient | Amount per 100g |
|---|---|
| Calories | 408 kcal |
| Protein | 72.4 g |
| Carbohydrates | 11.9 g |
| Dietary fiber | 5.0 g |
| Fat | 6.8 g |
What is yeast protein used for?
It is used to increase daily protein intake from plant sources.
Fibre and Beta-Glucans
Yeast provides fibre, and part of it is beta-glucans from the cell wall. In yeast protein powder the amount is small (5 g per 100 g, according to the table above).
There is no authorised health claim for yeast beta-glucans on cholesterol: that one exists only for oat and barley beta-glucans.
Muscle Recovery: What Its Protein Provides
Its contribution to recovery comes mainly from the protein: it contains essential amino acids, which muscle needs to repair itself after training.
Recovery also depends on rest, on total daily protein and on a proper meal after training.
Fibre and Microbiota
Its fibre feeds the bacteria of the gut microbiota. If you want to know more, see our guide to prebiotics and probiotics.
How should you take yeast protein daily?
You can add it directly to drinks, shakes or protein blends. Because it is a 100% soluble powder, it fits easily into your daily routine.
How much nutritional yeast per day?
The usual amount is 1-2 tablespoons a day (5-15 g) sprinkled on food. Yeast protein powder is used on a different scale: a 25-30 g serving in a shake. Start small: the fibre can cause gas if you are not used to it.
Is nutritional yeast vegan?
Yes. It is a fungus grown on molasses or sugars and contains no animal ingredients, which is why it is common in vegan diets to add a cheesy flavour plus protein and B vitamins. Check the label if you want B12: not all of it is fortified.
How Much Yeast Protein to Take
The usual amount is a 25-30 g serving of yeast protein powder, normally in a shake.
That amount provides quality protein; regularly going above it adds no benefit for performance.
What happens if you consume yeast every day?
Nothing special: it can be part of your daily diet if you tolerate it well. It gives a steady supply of amino acids and B vitamins, but it does not replace a varied diet. If you have gout or any of the conditions listed below, check with your doctor first.
Preparation and optimal consumption options
It is a 100% soluble powder for drinks. Here is the most practical way to make the most of it:
Use in post-workout protein shakes
Adding one scoop of this superfood to your usual shake adds protein to the blend.
It combines well with plant protein isolates or whey protein.
Contraindications of yeast protein
It is a highly tolerated food, although a sudden introduction in very high doses may cause temporary gastric discomfort.
Disadvantages and possible digestive side effects
The main adverse effect is gas or abdominal bloating due to its high concentration of prebiotic fiber.
It also contains tyramine, an amine that acts as a vasoactive compound in high amounts. People prone to severe migraines should test small tolerances, as this compound may act as a headache trigger.
What are the side effects of nutritional yeast?
Avoid it, or check first, if you have gout or high uric acid (because of purines), inflammatory bowel disease, a yeast allergy or sensitivity, or take MAOI antidepressants (because of tyramine). Digestive effects such as gas and bloating are the most common. In pregnancy, ask your doctor or midwife.
People taking monoamine oxidase inhibitor antidepressants (MAOIs) should avoid consumption. The interaction between these drugs and tyramine can trigger dangerous spikes in blood pressure.
Where can you buy quality yeast protein?
You can buy this supplement on our website or at points of sale where the JustLoading brand is available (private label/MDD).
JustLoading Yeast Protein
JustLoading yeast protein is obtained from Saccharomyces cerevisiae by fermentation. It is a vegan protein, designed as an alternative to whey.
You can get it in mixed berries flavour and also in coffee flavour. Check the label for amounts per serving, and browse the rest of the protein powders.
