The Products
Kasé
Two expressions. One forest.
Both products begin with the same hand-tapped Estonian birch sap, fermented naturally for a minimum of six months.
Kasé Original
The unaltered expression. Still, dry, and mineral — exactly as the forest intended.
100% pure birch sap, tapped by hand in early spring and fermented naturally for a minimum of six months. No sugar. No preservatives. No carbonation. The faint effervescence you taste is a natural byproduct of fermentation — the forest's own signature.
Volume
330 ml
Price
$11.99
One ingredient. One harvest. One expression.
Kasé Carbonated
A completely unique spark. The same fermented birch sap — now alive with fine carbonation.
Everything that makes Kasé Original extraordinary, now with an added dimension. Fine carbonation amplifies the mineral character and lifts the dry, tart finish into something entirely its own. There is nothing else like it. A sparkling beverage with genuine provenance — not flavoured, not sweetened, not engineered. Just birch, fermentation, and effervescence.
Volume
250 ml
Price
$8.99
Same forest. New energy.
Kasé Original — In Detail
A single-origin fermented beverage from the birch forests of Estonia. One ingredient. One harvest. One expression.
Kasé Original is made from 100% pure birch sap, tapped by hand in early spring from Estonian birch forests and fermented naturally for a minimum of six months.
No sugar is added. No preservatives. No carbonation. The faint effervescence you taste is a natural byproduct of fermentation — the forest's own signature.
Origin
Estonia
Ingredient
100% Birch Sap
Fermentation
Minimum 6 months
Additives
None
Sugar
0g added
Calories
0 kcal
Volume
330 ml
Price
$11.99 / bottle
Kasé Carbonated — In Detail
A completely unique spark. The same fermented birch sap — now alive with fine carbonation.
Everything that makes Kasé Original extraordinary, now with an added dimension. Fine carbonation amplifies the mineral character and lifts the dry, tart finish into something entirely its own. There is nothing else like it. A sparkling beverage with genuine provenance — not flavoured, not sweetened, not engineered. Just birch, fermentation, and effervescence.
Origin
Estonia
Ingredient
100% Birch Sap
Fermentation
Minimum 6 months
Carbonation
Fine, added
Sugar
0g added
Calories
0 kcal
Volume
250 ml
Price
$8.99 / can
Tasting Notes
"Clean on entry. Faintly effervescent. Mineral, with a whisper of tart — like cold spring water with memory. A long, dry finish that lingers without sweetness."
For best taste, consume chilled, 40-55°F. Best enjoyed alone or alongside raw seafood, aged cheese, or light Nordic cuisine.
Nutritional information
What's inside.
Birch sap contains a naturally occurring mineral profile that no other plant beverage can replicate. Fermentation preserves and concentrates these qualities.
Key mineral
Manganese
One bottle of Kasé provides a daily dose of manganese — a trace mineral rarely found in meaningful concentrations in any beverage.
Birch sap is one of the few natural liquid sources of bioavailable manganese.
What it supports
Manganese activates the body's primary antioxidant enzyme, superoxide dismutase (SOD), which neutralises free radicals at the cellular level. It also supports bone formation, carbohydrate metabolism, and connective tissue synthesis.
Trace minerals
Kasé has various other naturally occurring trace minerals which contribute to its clean, complex mineral character.
Potassium
Electrolyte balance & heart function
Magnesium
Muscle relaxation & nerve signalling
Calcium
Bone density & cellular signalling
Zinc
Immune defence & cellular repair
Phosphorus
Energy metabolism & bone structure
Iron
Oxygen transport in the blood
Live lactic cultures
Natural fermentation introduces a community of lactic acid bacteria — primarily Lactobacillus species — that are present in every bottle of Kasé. These cultures are a byproduct of the fermentation process, not an additive. Birch sap also contains naturally occurring betulin, saponins, and small amounts of fructose, which feed the fermentation and contribute to the dry, slightly tart finish.
Lactic acid bacteria
Naturally occurring from fermentation
Betulin
Birch-specific triterpene with antioxidant properties
Saponins
Natural plant compounds found in birch sap
Xylitol (trace)
Naturally present in birch — not added
Organic acids
Malic, citric, and lactic acids from fermentation
Official Label
Kasé Original — Nutritional Panel
Secure your allocation.
Kasé is available by subscription only. Each year's harvest is finite — once allocations are filled, the next shipment is twelve months away.