What is the size of the shampoo bottle?

The shampoo comes in a 500ml quantity.

How can I verify this product is genuine?

The item is identified by barcode 8901644000147.

The listing indicates this is an open item.

Open Beauty Facts

500ml

Used

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New / Sealed

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What is the size of the shampoo bottle?: The shampoo comes in a 500ml quantity.
How can I verify this product is genuine?: The item is identified by barcode 8901644000147.
Is this shampoo new or used?: The listing indicates this is an open item.