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The Marina Biome Brightening Ampoule by Earth Harbor is a fantastic dupe for the Herbivore Blue Tansy Oil. Packed with spirulina and blue tansy, this ampoule offers the same vibrant blue color and hydrating properties as its pricier counterpart. Juliana, the reviewer, loves how it brightens and evens out her skin tone, leaving her with a gorgeous glow. She applies a small amount, as a little goes a long way. If you've been eyeing the Herbivore Blue Tansy Oil but it's not within your budget, Juliana highly recommends giving this ampoule a try. It's a game-changer for achieving radiant skin.