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1 Liter / 33.8 FL. OZ. Purchased from the authentic Biolage Amazon storefront. Nearly full bottle. It’s perfectly fine— just wasn’t what we needed. Approximately 1/8 of the bottle is gone. - Purify for a healthy looking, clean scalp. Inspired by the anti bacterial and calming properties of the Mint Leaf, Biolage ScalpSync Anti Dandruff Shampoo with Pyrithione Zinc helps target dandruff, control the appearance of visible flakes and relieves scalp irritation.