Fermented Birch Sap Nature - organic
Fermented birch sap (unpasteurized) in a 3L bag-in-box
Certified organic and Nature & Progrès
Harvest spring 2026
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€33.08
Fermented Birch Sap Nature - organic images
ORGANIC FERMENTED BIRCH SAP 3L - PLAIN
Origin: Plateau de Sault, Cathar Pyrenees (Occitanie)
The fermented birch sap is a traditional plant-based drink with a slightly tangy taste, collected every spring in birch forests. The one we offer is Probiosève®, collected at an altitude of 900 metres on the Plateau de Sault, in the very heart of the Cathar Pyrenees, by the small team at La Sève Cathare. 3 L bag-in-box, organic, unpasteurised, no preservatives.
Birch sap has been used since ancient times. Forgotten for a few decades, it is now returning to our springtime habits. This seasonal drink is collected from February to April, in early spring, when the sap rises in the tree to wake the buds. A nutrient liquid, it circulates through the birch's vessels and carries water and minerals from the soil to the branches, to provide the energy needed to create new leaves and flowers.
Collected with respect from wild Pyrenean trees, the sap is then kept as it is for several months until it stabilises. The naturally occurring sugars then initiate a fermentation - non-alcoholic - which gives birch sap its characteristic slightly tangy taste. In practical terms, this process allows the sap to be kept for several years without any additions, without heat treatment, and without a cold chain.
🌳 Why a fermented sap rather than fresh?
Lacto-fermentation is one of the oldest known methods of preservation. It preserves the compounds naturally present in fresh sap - minerals, organic acids, trace elements - without resorting to pasteurisation. Probiosève® remains a living product, naturally stable at room temperature (no need to refrigerate it), with no preservatives and no additives.
🌳 When and how to enjoy it?
The lacto-fermented birch sap is traditionally part of the rituals of the changing season, as a spring drink - a moment found in many forest cultures, from Northern Europe to Scandinavia. With Aurélie, we include it every year when spring returns, as a little rendezvous with the season that is opening.
Serving suggestion: a small glass of around 15 cL in the morning, preferably on an empty stomach, during the spring period. The 3 L bag-in-box format allows around 20 servings of 15 cL for one person. For a detailed overview of the traditional uses of sap, see our complete guide to birch sap.
Discover the sap harvest in pictures:
🌳 A drink rooted in European tradition
Birch sap has accompanied the inhabitants of Northern Europe, the Baltic countries, Central Europe and the forest regions of France for centuries. Its harvest, limited to the short spring window from February to April depending on altitude, makes it a rare and seasonal drink in the European food heritage. Frankly, when you look at the peoples who have practised this for generations - Finns, Latvians, Russians, inhabitants of the Carpathians - you realise how ancient and deeply rooted this ritual is.
🌳 Lacto-fermentation, an ancestral process
During the natural fermentation of fresh sap, the plant sugars are transformed by the naturally present lactic ferments. It is this process that gives fermented birch sap its slightly tangy taste and allows it to be kept at room temperature, without pasteurisation or additives. The lactic acid naturally produced during this fermentation is the same as that found in sauerkraut, kefir or lacto-fermented vegetables - a family of living foods that we have championed at Biovie since 2007.
🌳 A composition that comes from the tree and its soil
Birch sap is naturally made up of plant water, simple sugars, organic acids and minerals from the soil into which the tree sinks its roots. The Plateau de Sault, at an altitude of 900 m in the Cathar Pyrenees, offers a preserved terroir, far from the large agricultural plains and industrial pollution. It is a detail which, for us, makes all the difference: the quality of a sap depends directly on the quality of the soil and the environment in which the tree grows.
La Sève Cathare: PROBIOSEVE®
The small team at La Sève Cathare began collecting birch sap in 2011 on the Plateau de Sault at an altitude of 900 m in wild Pyrenean forests preserved from chemical or electromagnetic pollution.
The trees are consulted and thanked during the harvest for their generosity and for sharing their precious nectar. La Sève Cathare works with respect and kindness towards the trees to offer a product of great quality.
Best before: 31/12/2026
Composition : 100% organic fermented birch sap, from the Plateau de Sault (Cathar Pyrenees, Occitanie). Unpasteurised, no preservatives, nothing added.
Indicative nutritional values (per 100 ml):
- Water : around 98%
- Energy value : very low, in the region of 20 kcal per 100 ml
- Simple sugars (glucose, fructose): around 0.6 to 1.1 g per 100 ml
- Minerals : calcium, magnesium, potassium, silicon - levels naturally variable depending on the terroir, climate and harvest season
- Amino acids : up to 17 amino acids identified in birch sap, including asparagine, glutamine, arginine, serine and glycine
- Specific compounds : betuloside, polyphenols and flavonoids naturally present
⚠️ Indicative values, taken from the available literature on birch sap and not from a laboratory analysis specific to this batch. The natural composition of the sap varies according to the soil, the climate and the harvest period.
Packaging : 3 L bag-in-box. Pouring tap included. The bag-in-box is specifically designed to prevent air from entering the pouch when serving, which keeps the sap fresh for several weeks after opening.
Storage : at room temperature, both before and after opening (no need to refrigerate it, as the sap is already lacto-fermented and naturally stable).
Serving suggestion : a small glass of around 15 cL in the morning, preferably on an empty stomach, in springtime. The 3 L bag-in-box allows around 20 servings for one person.
Precautions for use : this fermented drink is naturally non-alcoholic and suitable for most adults. As a precaution, we recommend seeking prior medical advice in the following cases: children under 7, pregnant or breastfeeding women, people allergic to salicylate derivatives (aspirin), people on anticoagulants, antidiabetic treatment or immunosuppressant treatment, people with kidney conditions. For more details, see our article on the contraindications and precautions for birch sap.
Regulatory information : this product is a food. It is neither a medicine nor a food supplement. In accordance with Regulation (EC) No 1924/2006, no therapeutic claim is associated with fermented birch sap. A varied and balanced diet and a healthy lifestyle are the basis of good health.
Frequently asked questions
How do you drink Biovie fermented birch sap?
The serving suggestion is a small glass of around 15 cL in the morning, preferably on an empty stomach, at least 15 minutes before breakfast. It is a moment traditionally associated with spring rituals, but thanks to lacto-fermentation, the sap keeps and can just as well be drunk in other seasons.
Should birch sap be kept in the refrigerator?
No. Thanks to lacto-fermentation, Probiosève® is a living product, naturally stable at room temperature, both before and after opening. There is no need to refrigerate it.
How long does the sap keep once the bag-in-box is opened?
The 3 L bag-in-box is specifically designed to prevent air from entering the pouch when serving, which keeps the sap fresh for several weeks after opening, at room temperature.
Where does this birch sap come from?
This sap is collected at an altitude of 900 metres on the Plateau de Sault, in the Cathar Pyrenees (Occitanie), by the small team at La Sève Cathare, from wild trees preserved from the large agricultural plains and industrial pollution.
How many servings does the 3 L bag-in-box format allow?
The 3 L format allows around 20 servings of 15 cL for one person, at one glass per day, i.e. a supply for several weeks.
What precautions should you know about before drinking birch sap?
This fermented drink is naturally non-alcoholic and suitable for most adults. As a precaution, prior medical advice is recommended for children under 7, pregnant or breastfeeding women, people allergic to salicylate derivatives (aspirin), on anticoagulants, on antidiabetic or immunosuppressant treatment, or with kidney conditions.
What is the composition of fermented birch sap?
Birch sap is naturally made up of plant water, simple sugars, organic acids and minerals from the soil in which the tree grows, in particular calcium, magnesium, potassium and silicon. This Probiosève® is 100% organic fermented birch sap, unpasteurised, with no preservatives or additions.
The information presented on this page is provided for information purposes only and does not constitute medical advice. Consult a healthcare professional before making any change to your diet or in the case of ongoing treatment.
Updated: September 2026. Product selected and validated by Éric Viard, founder of Biovie and ISTOM, co-author of Algues au quotidien (Gallimard, 2024) - Best cookbook in the world, Gourmand Cookbook Awards 2025, and Best cookbook in France, Académie Nationale de Cuisine 2025.
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