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The Vegan Collagen Lash Serum Primer by Pacifica is a cruelty-free and environmentally friendly product that comes in a glass bottle. According to Reygan's video review, this lash serum and primer feels great on the lashes and effectively lifts them for mascara application. The reviewer demonstrates the difference in lash volume after applying one and two layers of mascara with this primer. Reygan highly recommends this product, noting that it also doubles as a lash serum, making it suitable for overnight use. Overall, the Vegan Collagen Lash Serum Primer by Pacifica appears to be a beneficial cosmetic product that enhances lash volume and offers the added benefit of being vegan and eco-friendly.