EAA

What are essential amino acids?

The proteins in your body are assembled from twenty amino acids. Your body can produce eleven of them from other molecules. The other nine, it cannot: it lacks the synthesis pathways for these, and they must therefore come from food. These are essential amino acids, or EAAs (Essential Amino Acids).

Here they are: leucine, isoleucine, valine, lysine, methionine, threonine, phenylalanine, tryptophan, histidine. The first three are branched-chain amino acids, better known as BCAAs.

The key principle is stated in one sentence: protein synthesis stops as soon as a single essential amino acid is missing. This is the limiting factor principle. Leucine may send the building signal—that's its role, and why it's highlighted everywhere—but if lysine or methionine are not available, the chain will not assemble. Building muscle requires all nine, together.

This is exactly what separates an EAA product from a BCAA product. BCAAs provide only three out of the nine. They trigger the signal without delivering the building blocks. We also state this on our BCAA page, where this point is elaborated: BCAAs alone are largely outmatched by EAAs physiologically, even if they retain legitimate uses for taste, cost, and comfort during workouts.

EAA or whey: which to choose?

This is an honest question, and the answer doesn't favor the average shopping cart. Whey is already a complete source of essential amino acids. This is not a marketing approximation: whey protein contains all nine EAAs, in good proportions, with a high leucine content. A dose of whey isolate or concentrated whey provides the full spectrum.

And it does so for less money. Free amino acids are produced by fermentation or extraction, purified one by one, then recombined: this is a costly process. Per gram of essential amino acids actually supplied, a tub of whey is significantly cheaper than a tub of EAAs. For most exercisers, a dose of whey already covers their EAA needs, at the best price. If you haven't sorted this basic need yet, start with our proteins before adding free amino acids.

Powdered EAAs have an advantage that whey does not: they are already broken down. There's nothing to digest, absorption is rapid, they contain almost no calories, and they mix into a clear drink rather than a thick shake. These characteristics—not inherent superiority for muscle building—define their true use cases.

When are EAAs truly useful?

Five situations genuinely justify them.

Fasted training

If you train in the morning without having eaten, your blood does not contain available essential amino acids. An EAA drink sipped during the session provides them without requiring digestion and without the heaviness of a meal in your stomach. This is the strongest use case, and one where BCAAs are, on the contrary, most unsuitable, as six out of nine amino acids would be missing.

Long sessions

Beyond 75 to 90 minutes of effort, intake during the session makes sense. A drink combining EAAs, electrolytes, and possibly fast-absorbing carbohydrates like maltodextrin or cyclic dextrin can be consumed without discomfort, unlike a protein shake.

Difficult digestion

Some people don't tolerate whey: poorly managed lactose intolerance, bloating, a feeling of heaviness during exercise. Free-form EAAs require no digestive effort. Clear whey is the other option to consider in this case.

Vegan diet

Plant proteins are often limiting in a specific amino acid: lysine for cereals, methionine for legumes. Fermented EAAs fill this deficit in a targeted way, without animal products.

Calorie deficit

During a cutting phase, the goal is to preserve muscle mass with few calories available. EAAs provide the full spectrum for almost zero caloric load, which is useful when every calorie counts. They remain a supplement: the priority in weight loss remains a high daily protein intake, from whole foods and protein powder.

Outside of these cases, if you eat well and have a shake after your workout, additional EAAs will provide no measurable benefit. We prefer to tell you this rather than sell you a product you don't need.

How to dose EAAs and read leucine content?

The reference dose is between 10 and 15 g of EAAs per serving. Below 8 g, the intake becomes anecdotal compared to needs; above 15 g, it is better to switch to a complete protein, which is cheaper and more satiating.

The number to check on the label is the amount of leucine per dose. Aim for at least 2.5 g. This is the commonly accepted benchmark for fully triggering protein synthesis, and it is also what a standard dose of whey provides. Many formulas proudly display "9 essential amino acids" without giving details: without a line-by-line breakdown, you don't know what you're buying. Some contain 500 mg of leucine and a lot of flavor fillers.

Second check: the actual presence of all nine. Some products sold in the EAA section contain only six or seven, omitting tryptophan or histidine, which are more expensive. The list must be complete.

For preparation, count 400 to 600 ml of cold water for 10 to 15 g. Drink during your workout, in small sips, or within 30 minutes before if you are fasted. On non-workout days, EAAs have no particular benefit if your meals cover your protein needs.

What taste and solubility to expect?

It's important to state upfront: essential amino acids have a challenging taste. Leucine is bitter, methionine and cysteine have sulfuric notes, and tryptophan has a persistent bitterness. It is precisely because they contain these amino acids that EAAs are harder to flavor than BCAAs. Manufacturers compensate with powerful, often acidic flavors—citrus, red berries, cola.

Practical consequences: prefer acidic flavors, which mask bitterness better than creamy flavors; use more water than the recommended dose if the taste bothers you; serve very cold. As for solubility, a slight residue and foam on the surface are normal and do not indicate a quality defect.

Finally, what not to expect from EAAs: they do not replace sufficient daily protein intake, do not cause weight loss, do not compensate for poorly structured training, and do not produce a perceptible effect during the session—no boost, no pump. Their action is structural, silent, and slow. In case of kidney or liver disease, pregnancy, breastfeeding, or ongoing treatment, ask your doctor's advice before any amino acid supplementation.

Frequently Asked Questions

What are EAAs?

The abbreviation for Essential Amino Acids: the nine amino acids your body cannot produce and must come from food. An EAA product provides them in free form, already separated, ready to be absorbed without digestion. It is not a protein: it is a protein already broken down, without the associated calories or satiety.

What is the role of leucine?

It is the trigger amino acid. Above a certain blood threshold, it activates the mTOR pathway, which signals the start of muscle protein synthesis—hence the 2.5 g leucine benchmark per serving, found in a standard dose of whey. But a signal alone builds nothing: if the other eight essential amino acids are missing, the chain will not assemble. This is the whole limitation of products that rely solely on leucine.

What are the 9 essential amino acids?

Leucine, isoleucine, valine, lysine, methionine, threonine, phenylalanine, tryptophan, and histidine. You still often read "the 8 essential amino acids": histidine was long considered essential only in children, before being recognized as essential at all ages. The first three on the list are branched-chain amino acids, sold separately as BCAAs. A product that claims "EAA" must contain all nine: some formulas omit tryptophan or histidine, which are more expensive, and therefore do not deserve the appellation.

What is an amino acid?

It is the basic building block of proteins: a small organic molecule with an amine group and an acid group, capable of linking to its neighbors by a peptide bond. Twenty amino acids make up human proteins, and the order in which they link determines what the protein becomes: muscle fiber, enzyme, antibody, transporter. Digesting a steak or a shake involves breaking down these chains into isolated amino acids, which the body then reassembles according to its own plans. Eleven of them can be made by the body; nine must come from food.

EAA or BCAA: which should I take?

EAAs, in almost all situations. They contain all nine essential amino acids; BCAAs only contain three. BCAAs retain an interest for taste, cost, and intra-training comfort for someone whose overall protein intake is already covered, but they cannot build a complete protein on their own.

When to take EAAs?

On training days, around your workout: 10 to 15 g in 400 to 600 ml of cold water, to sip during exercise, or in the 30 minutes before if you are starting fasted. For a very long session, a second intake can be considered. On rest days, if your meals cover your protein needs, they have no particular role. Timing remains secondary to total protein intake over 24 hours: a regular daily intake is better than a perfectly timed intake on an insufficient base.

What are EAAs used for in bodybuilding?

To provide all the building blocks needed for muscle protein synthesis, in situations where food does not provide them at the right time: fasted training, sessions longer than 90 minutes, difficult digestion, significant caloric deficit. Outside of these cases, their additional contribution is small: what determines muscle gain remains the total daily protein and calorie intake. An EAA is also not felt during the session—no boost, no pump. Its action is structural and silent.

What are the benefits of EAAs?

Three, provided we remain precise. They provide the full spectrum of essential amino acids for almost zero caloric load, which matters when every calorie counts. They are absorbed without digestive effort, in 15 to 30 minutes, whereas a whole protein requires digestion: useful when fasted or during intense effort. They are consumed in a clear and light drink, easier to swallow during a session than a thick shake. What they don't do: cause weight loss, replace meals, or compensate for poorly structured training.

Are EAAs dangerous?

They are the same amino acids as those found in meat, eggs, or fish, simply isolated and purified: a healthy adult finds nothing alien to their diet. At usual doses, reported effects are limited to digestive discomfort, especially with a large dose swallowed at once on an empty stomach. Real contraindications are medical: metabolic amino acid disorders, kidney failure, liver failure, pregnancy, breastfeeding, ongoing treatment. In these situations, only your doctor can advise, and self-medication has no place.

Where to find amino acids in food?

In all proteins, but not in the same proportions. Eggs, meats, fish, and dairy products provide all nine essentials in a profile close to human needs, with whey from milk being the most concentrated in leucine. On the plant side, soy, peas, and quinoa are complete; cereals tend to lack lysine and legumes methionine, hence the benefit of combining them throughout the day. The Ciqual database publishes the detailed composition of each food.

How to make up for a protein deficiency?

Start by measuring rather than assuming: record your intake over three typical days. The common benchmark for a regular exerciser is between 1.6 and 2.2 g of protein per kilogram of body weight per day. Then distribute this over three to four servings of 25 to 40 g rather than concentrating everything in the evening. If the gap persists, powder remains the simplest way to fill it: our proteins cover this need at a significantly lower cost per gram than free amino acids.

What EAAs do we offer?

This is our largest collection of amino acids, covering the different uses described above. For a complete and clear EAA: formulas from TrainedByJP, the twelve-amino-acid EAA+ from ESN, the vegan fermented EAA from Naughty Boy, and the Juiced EAA from Sinob. IO Genix offers Kyowa quality amino acids, and Strom Supplements an EAA combined with ActiGin.

For long sessions and training in hot weather, several references combine amino acids and minerals: hydration formulas from RAW Nutrition and Rule One, or electrolytes to be dosed separately. Applied Nutrition completes the selection for intra-training formats.

Advice at a store near Montpellier?

Our Vendargues store, about ten minutes from Montpellier, allows you to return two pots and compare the tables: number of amino acids actually present, leucine per dose, price per serving. We will also tell you when a simple whey will suffice. We ship everywhere in France and Europe.

Sources: ANSES for French recommendations on dietary supplements for athletes, Ciqual for the amino acid composition of foods, EFSA for European scientific opinions.

To go further: how to choose your essential amino acids well.