We source from pristine birch forests in northern China . The cold climate and vast landscape allow for a sustainable harvest of naturally sweeter birch sap — clean, mineral-rich, and untouched.

Birch water has roughly four times fewer calories than coconut water, with significantly less sugar and no tropical sweetness. Instead of being processed from fruit, it is naturally filtered through tree roots and enriched with over 200 bioactive compounds, including minerals, antioxidants, and amino acids. Nature’s reverse osmosis.

Each 330ml bottle contains just 25 calories, coming naturally from 3g of sugar found in the birch sap itself. No added sugar, no sweeteners, just what the tree gives. For comparison, banana water comes in at around 50 calories per 330ml, and cactus water ranges from 25 to 35 calories, often with juice concentrates or added ingredients. OOZ is one ingredient. Nothing else.

Birch water is natural, low calorie, and free from additives, making it a great choice for all ages. In fact, across Northern Europe birch water was traditionally given to children and babies as a natural remedy during cold and flu season — a practice passed down for centuries. As always, if you have a known birch pollen allergy, consult your doctor before drinking.

You can order OOZ directly from our website as a one-time purchase, or subscribe for regular delivery (coming soon). We're also available at select retail partners across NYC! Use our store locator to find a spot near you. Subscribing is the easiest way to make OOZ part of your daily ritual, and you'll save on every order.

This is an important question and one we take seriously. Studies suggest that approximately 39% of individuals with birch pollen allergies may show sensitivity to birch sap, and cross reactivity is possible. If you have a known birch pollen allergy, we recommend consulting your doctor before trying OOZ. Your safety always comes first.

Glass preserves the clean, natural taste of birch sap without introducing any unwanted flavors. It contains no microplastics and does not interact with the liquid, ensuring what you drink is exactly as it comes from the tree. Glass also allows us to carefully fill and seal each bottle while maintaining purity and stability, without compromise.

There is no strict rule! birch water is light enough to enjoy throughout the day. Most people find one to two bottles a great starting point, whether as a morning reset, post-workout refresh, or afternoon pick-me-up.