Is Japanese Indigo Leaf/Stem Extract vegan?

Polygonum Tinctorium Leaf/Stem Extract is also known as Japanese Indigo Leaf/Stem Extract.

Polygonum Tinctorium Leaf/Stem Extract is an extract of the leaves and stems of Polygonum tinctorium (Japanese indigo), a plant in the Polygonaceae family traditionally used as a source of indigo dye.

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