A carrier (13,20,23) for pharmaceutical compositions or supplements, said carrier comprising at least a first and a second portion (14,15), each of the first and second portions comprising: - at least two cavities (16,17,28,34) for housing pharmaceutical composition, and - at least one cover sheet covering said at least two cavities, said at least one cover sheet comprising elements; wherein the cavities of the first and second portions (14,15) are arranged so that the first and second portions (14,15) can be placed in an overlapping configuration with the cavities of the first portion positioned in spaces between the cavities of the second portion, and wherein - at least one of the cavities of the first portion comprises at least two bulges extending in opposite directions, and - at least two neighbouring of the cavities of the second portion each comprises at least one depression positioned and adapted to engage with one of said at least two bulges of the at least one cavity of the first portion to form a mutual engagement between the first and second portions (14,15), resulting in a snap-fit being established, by which engagement mutual movement of the first and second portions is restricted, so that a rigid structure is obtained the at least two neighbouring cavities with depressions having a cavity with bulges arranged in the space there between when the first and second portions are placed in an overlapping configuration, so that the engagement between the first and second portions (14,15) is obtainable by engagement between the bulges and the depressions; wherein the at least one cavity comprising at least two bulges further comprises at least two protuberances extending in the same directions as the at least two bulges, the at least two protuberances being dimensioned and arranged to engage with surfaces of cavities of the second portion resulting in an interference-fit being established, so that mutual movement of the first and second portions (14,15) is further restricted. - at least two cavities (16,17,28,34) for housing pharmaceutical composition, and - at least one cover sheet covering said at least two cavities, said at least one cover sheet comprising elements; wherein the cavities of the first and second portions (14,15) are arranged so that the first and second portions (14,15) can be placed in an overlapping configuration with the cavities of the first portion positioned in spaces between the cavities of the second portion, and wherein - at least one of the cavities of the first portion comprises at least two bulges extending in opposite directions, and - at least two neighbouring of the cavities of the second portion each comprises at least one depression positioned and adapted to engage with one of said at least two bulges of the at least one cavity of the first portion to form a mutual engagement between the first and second portions (14,15), resulting in a snap-fit being established, by which engagement mutual movement of the first and second portions is restricted, so that a rigid structure is obtained the at least two neighbouring cavities with depressions having a cavity with bulges arranged in the space there between when the first and second portions are placed in an overlapping configuration, so that the engagement between the first and second portions (14,15) is obtainable by engagement between the bulges and the depressions;