At the end of December 2025, we tested a number of substances of particular health concern. In addition to MDMA, one ecstasy tablet also contained the cathinone clephedrone (4-CMC). One tablet contained only Caffeine and another an extremely high dose of MDMA. Half of the samples submitted as mephedrone showed either exclusively or additionally one or more other cathinones (2-MMC, 4-CMC, 4-BEC).

Under the following link, all samples that have been analysed by checkit! since the last warnings and classified as high-dose, unexpected or of particular health concern are presented in detail: Current warnings KW 2 - 2026