
Longan Vinegar
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An evening tonic for restless sleep and a mind that won't quiet down — fermented longan, the 'dragon eye' fruit long used in TCM to calm without sedating.
- Traditionally calming for restless sleep and a busy mind
- Steadies blood sugar — fewer overnight dips that wake you
- Gentle, not sedating — eases you toward rest
Restful Sleep
Classical TCM herb for restless sleep and an overactive mind.
Nervous System Calm
Nourishes the heart and spleen systems linked to worry and rest.
Steadier Overnight Sugar
Fewer overnight dips that wake you before morning.
Evening Wind-Down
One vial in the evening — a botanical full stop to the day.
Key Ingredients

Dried Longan Fruit
Classical TCM herb nourishing the heart and spleen for calm and rest.

Rice Vinegar Ferment
A gentle fermentation base that carries the fruit's active compounds.

Jujube Date
A traditional pairing herb, long used alongside longan for restful sleep.

Schisandra Berry
An adaptogenic berry traditionally used to steady an overactive mind.
Description
In the herbal traditions of southern China and Southeast Asia, the longan — a small fruit with a dark seed at its centre, earning it the name 'dragon eye' — has long been the fruit reached for when the mind won't settle. Classical TCM describes it as nourishing to the heart and spleen, the systems traditionally linked to sleep and mental stamina. We ferment longan into a gentle evening vinegar, dosed for a wind-down ritual that calms without sedating — a small cue to your body that the day is closing.
How to Use
Open
Snap open one 10 mL vial.
Dilute
Stir into a small glass of warm water.
Drink
Take in the evening, as you wind down.
Repeat
Nightly, for 1–3 months.
Specifications
Questions about Longan Vinegar
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Traditional botanicals, measured to a clinical dose — the gentlest way to bring your body back into balance.
— The Arka Lab


















