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What is casein?
Milk contains two families of proteins: approximately 20% whey protein and approximately 80% casein. They contain the same amino acids but behave differently in the stomach: when it comes into contact with gastric acid, casein forms a gel that slowly breaks down. Amino acid release then extends over several hours, whereas whey is absorbed in about an hour.
Micellar or caseinate: they are not the same
Micellar casein is obtained by cold filtration: the natural structure of the protein is preserved, and with it, the slow behavior that makes it so valuable. Caseinate, on the other hand, is produced by acid precipitation followed by neutralization—cheaper, more soluble, but the micellar structure is lost, and digestion is accelerated. For nighttime use, micellar casein is what you should look for. Check the label: both are sold under the generic name "casein."
Casein and night: what it does and what it doesn't do
This is by far the most frequently asked question about this product, and it deserves a precise answer.
What it does
During the seven or eight hours of a night, no food intake occurs. A dose of casein taken before bed spreads the availability of amino acids over this period, instead of concentrating it in the first hour. Specifically, it helps to fill a gap in your daily protein total at a time when you are not eating.
What it doesn't do
Casein does not help with sleep. It is neither a sleeping pill nor a relaxant, and no such claim is permitted for this protein. If your problem is falling asleep, this is not the right section: look instead at melatonin, magnesium, or ZMA.
It also does not "make you gain weight overnight," contrary to what is sometimes read. A dose represents about a hundred calories, counted like any other.
What if you don't take it?
Honestly: if you are already meeting your daily protein intake and eating a proper meal in the evening, the additional gain is moderate. A bowl of quark or skyr plays the same role—they are also rich in casein. The advantage of powder is practical: the dosage is precise, digestion is light, and it can be prepared in thirty seconds.
Casein or whey: which one to choose?
- Around training — whey. Rapid assimilation is its forte.
- In the evening, or before a long period without eating — casein.
- As a satiating snack — casein, its thick texture keeps you feeling full longer.
- If you only take one — whey, more versatile.
The two are not mutually exclusive: many athletes keep whey around their workouts and casein in the evening. For mass gain, it adds calories without heaviness; for cutting, its satiating power helps to get through the evening.
How to take it
- Dose — 25 to 40 g, or one to two scoops depending on the brand.
- Time — thirty minutes before bed, or as a long snack between two spaced meals.
- Liquid — 300 to 400 ml. Casein thickens a lot: with too little water, you get a paste that is difficult to drink.
- Texture tip — let it sit for two minutes after shaking, the powder will finish hydrating, and lumps will disappear.
As a dessert, some caseins can be prepared with less liquid to obtain a spoonable cream — practical in the evening, and much more satisfying than a shaker.
Frequently Asked Questions
What is casein?
It is the main protein in milk: about 80% of milk proteins, the rest being whey. It is organized into micelles, spherical aggregates linked to calcium, which coagulate on contact with stomach acid — this is exactly what happens when milk curdles, and it is the very principle of cheese making. In powder form, it provides a slow-digesting protein, whose amino acids are released over five to seven hours. Same amino acid profile as whey, different speed: that's the whole distinction.
What is micellar casein?
It is casein in its native form, extracted from milk by cold filtration, without acid treatment. Its micelles remain intact, and it is this structure that forms a gel on contact with stomach acid before slowly breaking down. Caseinate, obtained by acid precipitation then neutralization, has lost this organization: more soluble, less thick, but digested faster. Both are sold under the generic name "casein," hence the importance of reading the composition line.
Why take casein?
For one solid reason: to cover a long period without food intake, primarily at night. It also serves as a satiating snack at the end of the day, where its thick texture is more filling than a liquid shake. Outside of these two uses, it has no advantage over whey, and if your evening meal is adequate and your protein quota is met, the additional gain remains moderate — a large bowl of quark plays the same role, for less money.
When to take casein?
In the evening, about thirty minutes before bed, or as a snack between very spaced meals — a work afternoon without a break, a long journey. These are the only periods where its release spread over five to seven hours offers something different from whey. Around training, it has no particular advantage: a fast-acting protein is more suitable. And if your daily protein intake is already met by meals, the timing of intake doesn't change much.
What is the best casein?
Three label lines differentiate two pots, and the brand is not one of them. First, the form: "micellar casein" in full letters, and not "calcium caseinate" or "sodium caseinate," otherwise the slow digestion — the product's sole interest — disappears. Then the protein content per 100g, to be read in this column and not in the dose column. Finally, the price per kilo of protein, and not per kilo of powder. Taste and texture also matter more than elsewhere: it's the thickest protein in the section, and the one most often abandoned at the back of a cupboard.
Does casein make you gain weight?
Not by itself, and especially not "because you take it in the evening": the body doesn't store calories differently after 8 p.m. A 30g dose provides about 110 to 120 kcal, counted like any other. You gain weight if your total daily intake exceeds your expenditure, not because of a particular food. Added to an already sufficient diet, it adds calories; substituted for a sugary dessert, it removes them. To gain weight deliberately, the mass gain section is for that.
When to take casein for weight loss?
Let's be frank: no specific time of day makes you lose weight, and casein has no fat-burning effect. What it can do during a calorie deficit is more modest and very real: it is very satiating, and the time it is most helpful is when you are most exposed to snacking — in practice, the evening, after dinner. Prepared thick, to be eaten with a spoon, it replaces a dessert for about 110 kcal. The result comes from the sustained deficit over time, not from the powder.
Which protein to choose for weight loss?
No protein powder makes you lose weight: it is the energy deficit that changes body composition. What proteins provide during this period is different and very real: for the same calories, they are more satiating than carbohydrates and fats, and they limit muscle mass loss when overall intake decreases. In this area, casein has a textural advantage — thick, it keeps you feeling full longer in the evening — while a whey isolate provides more protein for fewer calories. The rest of the process is detailed in our weight loss section.
Does casein present any danger?
For a healthy person, no: it's a milk protein, present in cheese and yogurts forever. Special cases are cow's milk protein allergy — different from lactose intolerance, and contraindicating the product regardless of its lactose content — and known kidney failure, which requires medical advice before increasing protein intake. A very generous dose taken with too little water can cause digestive discomfort: this is a preparation issue, not a product issue.
What foods contain casein?
All dairy products, since it represents about 80% of milk proteins. The most concentrated are quark, skyr, petit-suisse, and pressed cheeses. Two hundred to two hundred and fifty grams of quark provide a quantity of casein comparable to a dose of powder, for a lower price. The powder only has two advantages: precise dosage and lighter digestion in the evening. The Ciqual database provides protein content per food item.
Does casein contain lactose?
A little, generally less than one gram per serving for a filtered micellar, which is well below the threshold most intolerant people can tolerate. If you are very sensitive, a whey isolate or an egg protein remain safer. Not to be confused with cow's milk protein allergy: in this case, it is casein itself that is the cause.
How much protein do you need per day?
The ANSES recommends 0.83 g per kilogram of body weight per day for healthy adults. Sports nutrition guidelines place bodybuilders significantly higher, in a commonly cited range of 1.6 to 2.2 g per kilogram — the need depends on body mass and activity level, not gender. Distribute over three to four servings rather than concentrating everything in the evening. If meals are not enough, our proteins fill the gap.
What are the budget caseins worth?
The question to ask is not the price but the form: micellar or caseinate. Many inexpensive options are based on calcium or sodium caseinate, which is cheaper to produce and faster to digest—thus negating the product's main benefit. A cheap pot whose composition line indicates "caseinate" is actually an intermediate-speed protein sold as a slow protein. Check the composition, the protein content per 100g, and the price per kilo of protein: a properly labeled micellar is still the best buy, even if it costs a little more.
Where to buy casein?
Online on this page, with shipping throughout France and Europe, or in our Vendargues store, about ten minutes from Montpellier, where pickup is available within two hours. For this protein more than any other, buying in-store has a concrete advantage: texture and taste can be discussed before leaving with a kilogram pot, and it is the product in the section that is most often unused when chosen from a photo.
In stock in Vendargues, fifteen minutes from Montpellier
Our caseins are available at 285 Rue Des Portes Domitiennes in Vendargues. For a protein with such a distinct texture, testing it is important: it's the product most often found abandoned at the back of a cupboard when purchased based on a picture.
You can also order online: we ship throughout France and Europe.
We detail the composition of a micellar casein, its actual texture, and the best time to take it in our article on IO Genix casein.
Sources
- ANSES — Protein intake: consumption, quality, needs, and recommendations
- ANSES — Ciqual table of food nutritional composition
To be integrated into a varied and balanced diet and a healthy lifestyle.
Retrait au magasin sous 2 h
À Vendargues, près de Montpellier. Vous êtes prévenu dès que la commande est prête.
Commandé avant 14 h, expédié le jour même
Du lundi au samedi. Le délai d'acheminement appartient ensuite au transporteur.
Livraison offerte dès 50 €
En France métropolitaine, et dès 100 € en Europe. Modes et délais.
Une question avant de commander ?
Écrivez-nous ou passez au magasin : on connaît les produits qu'on vend.
What is casein?
Milk contains two families of proteins: approximately 20% whey protein and approximately 80% casein. They contain the same amino acids but behave differently in the stomach: when it comes into contact with gastric acid, casein forms a gel that slowly breaks down. Amino acid release then extends over several hours, whereas whey is absorbed in about an hour.
Micellar or caseinate: they are not the same
Micellar casein is obtained by cold filtration: the natural structure of the protein is preserved, and with it, the slow behavior that makes it so valuable. Caseinate, on the other hand, is produced by acid precipitation followed by neutralization—cheaper, more soluble, but the micellar structure is lost, and digestion is accelerated. For nighttime use, micellar casein is what you should look for. Check the label: both are sold under the generic name "casein."
Casein and night: what it does and what it doesn't do
This is by far the most frequently asked question about this product, and it deserves a precise answer.
What it does
During the seven or eight hours of a night, no food intake occurs. A dose of casein taken before bed spreads the availability of amino acids over this period, instead of concentrating it in the first hour. Specifically, it helps to fill a gap in your daily protein total at a time when you are not eating.
What it doesn't do
Casein does not help with sleep. It is neither a sleeping pill nor a relaxant, and no such claim is permitted for this protein. If your problem is falling asleep, this is not the right section: look instead at melatonin, magnesium, or ZMA.
It also does not "make you gain weight overnight," contrary to what is sometimes read. A dose represents about a hundred calories, counted like any other.
What if you don't take it?
Honestly: if you are already meeting your daily protein intake and eating a proper meal in the evening, the additional gain is moderate. A bowl of quark or skyr plays the same role—they are also rich in casein. The advantage of powder is practical: the dosage is precise, digestion is light, and it can be prepared in thirty seconds.
Casein or whey: which one to choose?
- Around training — whey. Rapid assimilation is its forte.
- In the evening, or before a long period without eating — casein.
- As a satiating snack — casein, its thick texture keeps you feeling full longer.
- If you only take one — whey, more versatile.
The two are not mutually exclusive: many athletes keep whey around their workouts and casein in the evening. For mass gain, it adds calories without heaviness; for cutting, its satiating power helps to get through the evening.
How to take it
- Dose — 25 to 40 g, or one to two scoops depending on the brand.
- Time — thirty minutes before bed, or as a long snack between two spaced meals.
- Liquid — 300 to 400 ml. Casein thickens a lot: with too little water, you get a paste that is difficult to drink.
- Texture tip — let it sit for two minutes after shaking, the powder will finish hydrating, and lumps will disappear.
As a dessert, some caseins can be prepared with less liquid to obtain a spoonable cream — practical in the evening, and much more satisfying than a shaker.
Frequently Asked Questions
What is casein?
It is the main protein in milk: about 80% of milk proteins, the rest being whey. It is organized into micelles, spherical aggregates linked to calcium, which coagulate on contact with stomach acid — this is exactly what happens when milk curdles, and it is the very principle of cheese making. In powder form, it provides a slow-digesting protein, whose amino acids are released over five to seven hours. Same amino acid profile as whey, different speed: that's the whole distinction.
What is micellar casein?
It is casein in its native form, extracted from milk by cold filtration, without acid treatment. Its micelles remain intact, and it is this structure that forms a gel on contact with stomach acid before slowly breaking down. Caseinate, obtained by acid precipitation then neutralization, has lost this organization: more soluble, less thick, but digested faster. Both are sold under the generic name "casein," hence the importance of reading the composition line.
Why take casein?
For one solid reason: to cover a long period without food intake, primarily at night. It also serves as a satiating snack at the end of the day, where its thick texture is more filling than a liquid shake. Outside of these two uses, it has no advantage over whey, and if your evening meal is adequate and your protein quota is met, the additional gain remains moderate — a large bowl of quark plays the same role, for less money.
When to take casein?
In the evening, about thirty minutes before bed, or as a snack between very spaced meals — a work afternoon without a break, a long journey. These are the only periods where its release spread over five to seven hours offers something different from whey. Around training, it has no particular advantage: a fast-acting protein is more suitable. And if your daily protein intake is already met by meals, the timing of intake doesn't change much.
What is the best casein?
Three label lines differentiate two pots, and the brand is not one of them. First, the form: "micellar casein" in full letters, and not "calcium caseinate" or "sodium caseinate," otherwise the slow digestion — the product's sole interest — disappears. Then the protein content per 100g, to be read in this column and not in the dose column. Finally, the price per kilo of protein, and not per kilo of powder. Taste and texture also matter more than elsewhere: it's the thickest protein in the section, and the one most often abandoned at the back of a cupboard.
Does casein make you gain weight?
Not by itself, and especially not "because you take it in the evening": the body doesn't store calories differently after 8 p.m. A 30g dose provides about 110 to 120 kcal, counted like any other. You gain weight if your total daily intake exceeds your expenditure, not because of a particular food. Added to an already sufficient diet, it adds calories; substituted for a sugary dessert, it removes them. To gain weight deliberately, the mass gain section is for that.
When to take casein for weight loss?
Let's be frank: no specific time of day makes you lose weight, and casein has no fat-burning effect. What it can do during a calorie deficit is more modest and very real: it is very satiating, and the time it is most helpful is when you are most exposed to snacking — in practice, the evening, after dinner. Prepared thick, to be eaten with a spoon, it replaces a dessert for about 110 kcal. The result comes from the sustained deficit over time, not from the powder.
Which protein to choose for weight loss?
No protein powder makes you lose weight: it is the energy deficit that changes body composition. What proteins provide during this period is different and very real: for the same calories, they are more satiating than carbohydrates and fats, and they limit muscle mass loss when overall intake decreases. In this area, casein has a textural advantage — thick, it keeps you feeling full longer in the evening — while a whey isolate provides more protein for fewer calories. The rest of the process is detailed in our weight loss section.
Does casein present any danger?
For a healthy person, no: it's a milk protein, present in cheese and yogurts forever. Special cases are cow's milk protein allergy — different from lactose intolerance, and contraindicating the product regardless of its lactose content — and known kidney failure, which requires medical advice before increasing protein intake. A very generous dose taken with too little water can cause digestive discomfort: this is a preparation issue, not a product issue.
What foods contain casein?
All dairy products, since it represents about 80% of milk proteins. The most concentrated are quark, skyr, petit-suisse, and pressed cheeses. Two hundred to two hundred and fifty grams of quark provide a quantity of casein comparable to a dose of powder, for a lower price. The powder only has two advantages: precise dosage and lighter digestion in the evening. The Ciqual database provides protein content per food item.
Does casein contain lactose?
A little, generally less than one gram per serving for a filtered micellar, which is well below the threshold most intolerant people can tolerate. If you are very sensitive, a whey isolate or an egg protein remain safer. Not to be confused with cow's milk protein allergy: in this case, it is casein itself that is the cause.
How much protein do you need per day?
The ANSES recommends 0.83 g per kilogram of body weight per day for healthy adults. Sports nutrition guidelines place bodybuilders significantly higher, in a commonly cited range of 1.6 to 2.2 g per kilogram — the need depends on body mass and activity level, not gender. Distribute over three to four servings rather than concentrating everything in the evening. If meals are not enough, our proteins fill the gap.
What are the budget caseins worth?
The question to ask is not the price but the form: micellar or caseinate. Many inexpensive options are based on calcium or sodium caseinate, which is cheaper to produce and faster to digest—thus negating the product's main benefit. A cheap pot whose composition line indicates "caseinate" is actually an intermediate-speed protein sold as a slow protein. Check the composition, the protein content per 100g, and the price per kilo of protein: a properly labeled micellar is still the best buy, even if it costs a little more.
Where to buy casein?
Online on this page, with shipping throughout France and Europe, or in our Vendargues store, about ten minutes from Montpellier, where pickup is available within two hours. For this protein more than any other, buying in-store has a concrete advantage: texture and taste can be discussed before leaving with a kilogram pot, and it is the product in the section that is most often unused when chosen from a photo.
In stock in Vendargues, fifteen minutes from Montpellier
Our caseins are available at 285 Rue Des Portes Domitiennes in Vendargues. For a protein with such a distinct texture, testing it is important: it's the product most often found abandoned at the back of a cupboard when purchased based on a picture.
You can also order online: we ship throughout France and Europe.
We detail the composition of a micellar casein, its actual texture, and the best time to take it in our article on IO Genix casein.
Sources
- ANSES — Protein intake: consumption, quality, needs, and recommendations
- ANSES — Ciqual table of food nutritional composition
To be integrated into a varied and balanced diet and a healthy lifestyle.
