The present invention concerns a beverage preparation capsule (11) defining a closed chamber for enclosing a mass of soluble and/or extractable food material, for use in a beverage preparation machine, comprising: (i) a capsule body with side walls (12), a bottom wall (13) open with a dispensing opening (14), said capsule body walls comprising an injection-moulded oil-based or biomass-based thermoplastic material, which is not a gas-barrier material, (ii) a gas and moisture impermeable top membrane (15), pierceable by injection means (N) of the machine which are adapted to inject an extraction liquid under pressure inside said chamber, and (iii) a gas and moisture impermeable bottom membrane (16) sealed inside the capsule body near the bottom wall (13), (iv) means (18) adapted to open said chamber by relative engagement with the bottom membrane under the effect of the liquid pressure increase in the chamber during injection of said liquid, characterized in that the inside or outside surface of the capsule body is at least partially covered by a gas-, and optionally moisture-, impermeable label (20) permanently attached by in-mould labelling to said capsule body wall, said label having a tridimensional shape such that the labelled capsule is gas and moisture tight.