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Lepisorus thunbergiana (species of fern)
Nothing is felt on the tongue except a faint numbness on the lips and throat. In the best sense of the word, it is a refreshing drink.
However, as the description says, "Nama-moto brewed by growing lactic acid bacteria," the lactic acid bacteria drink-like flavor is tremendously assertive. It is tremendous.
Calpis that is not sweet.
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