Fermented Birch Sap Nature - organic images
Fermented Birch Sap Nature - organic
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Fermented birch sap (unpasteurized) in a 3L bag-in-box
Certified organic and Nature & Progrès
Harvest spring 2026
ORGANIC FERMENTED BIRCH SAP 3L - NATURE
Origin: Plateau de Sault, Cathar Pyrenees (Occitanie)
The fermented birch sap is a traditional plant-based drink with a slightly tangy taste, harvested every spring in birch forests. The one we offer is Probiosève®, harvested at 900 meters altitude on the Plateau de Sault, in the heart of the Cathar Pyrenees, by the small team of La Sève Cathare. 3 L bag-in-box, organic, unpasteurized, without preservatives.
Birch sap has been used since ancient times. Forgotten for a few decades, it is now returning to our spring habits. This seasonal drink is harvested from February to April, at the beginning of spring, when the sap rises in the tree to awaken the buds. As a nutritive liquid, it circulates through the birch's vessels, carrying water and minerals from the soil to the branches, providing the energy needed for the creation of new leaves and flowers.
Harvested respectfully from wild Pyrenean trees, the sap is then preserved as is for several months until stabilization. The naturally present sugars then initiate a non-alcoholic fermentation, giving the birch sap its characteristic slightly tangy taste. This process allows the sap to be preserved for several years without any additives, thermal transformation, or cold chain.
🌳 Why choose fermented sap over fresh sap?
Lactofermentation is one of the oldest known preservation methods. It preserves the naturally present compounds in fresh sap - minerals, organic acids, trace elements - without resorting to pasteurization. Probiosève® remains a living product, naturally stable at room temperature (no need to refrigerate), without preservatives or additives.
To delve deeper into this traditional know-how, check out our article lactofermentation, a true health asset.
🌳 When and how to enjoy it?
The lactofermented birch sap is traditionally part of seasonal change rituals, as a spring drink - a moment found in many forest cultures, from Northern Europe to Scandinavia. With Aurélie, we incorporate it every year with the return of spring, as a small rendezvous with the opening season. This period aligns with the spirit of spring renewal as described by Fanny, our naturopath partner.
Tasting suggestion: a small glass of about 15 cL in the morning, preferably on an empty stomach, during the spring period. The 3 L bag-in-box format allows for about 20 tastings of 15 cL for one person. For a detailed overview of traditional sap uses, consult our complete guide to birch sap.
Discover the sap harvest in images:
🌳 A drink rooted in European tradition
Birch sap has accompanied the inhabitants of Northern Europe, the Baltic countries, Central Europe, and French forest regions 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 European food heritage. Frankly, when observing the peoples who have integrated this practice for generations - Finns, Latvians, Russians, Carpathian inhabitants - one realizes how ancient and rooted this ritual is.
🌳 Lactofermentation, an ancestral process
During the natural fermentation of fresh sap, plant sugars are transformed by naturally present lactic ferments. This process gives fermented birch sap its slightly tangy taste and allows it to be preserved at room temperature, without pasteurization or additives. The lactic acid naturally produced during this fermentation is the same found in sauerkraut, kefir, or lactofermented vegetables - a family of living foods that we have been highlighting at Biovie since 2007.
🌳 A composition derived from the tree and its soil
Birch sap is naturally composed of plant water, simple sugars, organic acids, and minerals from the soil where the tree grows. The Plateau de Sault, at 900 m altitude in the Cathar Pyrenees, offers a preserved terroir, far from large agricultural plains and industrial pollution. This is a detail that, for us, makes all the difference: the quality of sap directly depends on the quality of the soil and the environment in which the tree grows.
🌳 For more information, check out our blog articles:
What are the benefits of fermented birch sap?
What are the benefits of birch sap?
Birch sap: benefits, properties, and complete cure guide
La Sève Cathare: PROBIOSEVE®
The small team of La Sève Cathare began harvesting birch sap in 2011 on the Plateau de Sault at 900 m altitude in preserved wild Pyrenean forests, free from chemical or electromagnetic pollution.
The trees are consulted and thanked during the harvest for their generosity and sharing of their precious nectar. La Sève Cathare works with respect and kindness towards the trees to offer a high-quality product.
Best before: 31/12/2026
Composition: 100% organic fermented birch sap, from the Plateau de Sault (Cathar Pyrenees, Occitanie). Unpasteurized, without preservatives, no additives.
Indicative nutritional values (per 100 ml):
- Water: about 98%, as birch sap is naturally very rich in plant water
- Energy value: very low, around 20 kcal per 100 ml
- Simple sugars (glucose, fructose): about 0.6 to 1.1 g per 100 ml
- Minerals in an assimilable form: calcium, magnesium, potassium, silicon - naturally variable contents 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, derived from available literature on birch sap and not from a specific laboratory analysis of this batch. The natural composition of sap varies according to soil, climate, and harvest period.
Packaging: 3 L bag-in-box. Pouring spout included. The bag-in-box is specifically designed to prevent air from entering the pouch during service, preserving the sap's freshness for several weeks after opening.
Storage method: at room temperature, both before and after opening (no need to refrigerate, as the sap is already lactofermented and naturally stable).
Tasting suggestion: a small glass of about 15 cL in the morning, preferably on an empty stomach, during spring. The 3 L bag-in-box allows for about 20 tastings for one person.
Precautions for use: this fermented drink is naturally non-alcoholic and suitable for most adults. As a precaution, we recommend seeking medical advice in the following cases: children under 7 years old, pregnant or breastfeeding women, people allergic to salicylate derivatives (aspirin), those on anticoagulants, antidiabetic treatment, or immunosuppressive treatment, and those with kidney disorders. For more details, consult our article dedicated to contraindications and precautions of birch sap.
Regulatory mentions: this product is a food. It is neither a medicine nor a dietary supplement. In accordance with Regulation (EC) No 1924/2006, no therapeutic claims are associated with fermented birch sap. A varied and balanced diet and a healthy lifestyle are the foundation of good health.
Frequently Asked Questions
How to consume Biovie fermented birch sap?
The tasting suggestion is a small glass of about 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 lactofermentation, the sap can be preserved and consumed in other seasons as well.
Should birch sap be stored in the refrigerator?
No. Thanks to lactofermentation, Probiosève® is a living product, naturally stable at room temperature, both before and after opening. It does not need to be refrigerated.
How long does the sap last once the bag-in-box is opened?
The 3 L bag-in-box is specifically designed to prevent air from entering the pouch during service, preserving the sap's freshness for several weeks after opening, at room temperature.
What is the origin of this birch sap?
This sap is harvested at 900 meters altitude on the Plateau de Sault, in the Cathar Pyrenees (Occitanie), by the small team of La Sève Cathare, from wild trees preserved from large agricultural plains and industrial pollution.
How many tastings does the 3 L bag-in-box format allow?
The 3 L format allows for about 20 tastings of 15 cL for one person, at a rate of one glass per day, providing a supply for several weeks.
What precautions should be known before consuming birch sap?
This fermented drink is naturally non-alcoholic and suitable for most adults. As a precaution, medical advice is recommended for children under 7 years old, pregnant or breastfeeding women, people allergic to salicylate derivatives (aspirin), those on anticoagulants, antidiabetic treatment, or immunosuppressive treatment, or those with kidney disorders.
What is the composition of fermented birch sap?
Birch sap is naturally composed of plant water, simple sugars, organic acids, and minerals from the soil where the tree grows, including calcium, magnesium, potassium, and silicon in an assimilable form. This Probiosève® is 100% organic fermented birch sap, unpasteurized, without preservatives or additives.
The information presented on this sheet is provided for informational purposes and does not constitute medical advice. Consult a healthcare professional before making any changes to your diet or if you are undergoing treatment.
Updated: September 2026. Product selected and validated by Éric Viard, founder of Biovie and engineer ISTOM, co-author of Algues au quotidien (Gallimard, 2024) - Best Cookbook in the World, Gourmand Cookbook Awards 2025, and Best Cookbook in France, National Culinary Academy 2025.
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