Is Silk hydrolysates, 2-hydroxypropyl derivatives vegan?

PG-Hydrolyzed Silk is also known as Silk hydrolysates, 2-hydroxypropyl derivatives.

PG-Hydrolyzed Silk is a propylene glycol derivative of hydrolysed silk protein, obtained from the cocoons of the silkworm (Bombyx mori), used in cosmetics as a skin- and hair-conditioning agent.

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