At the end of November 2025, we tested a range of substances that are particularly harmful to health. In addition to some (very) high-dose ecstasy tablets, two ecstasy tablets contained, among other things, MDMA and caffeine. All samples sold as mephedrone (4-MMC) contained either another synthetic cathinone such as 2-MMC or 4-CMC, an unknown substance or other substances or mixtures of substances in addition to mephedrone. In a sample submitted for analysis as hashish, MDMB-PINACA and two unknown substances detected; in another, two unknown substances.

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 week 50 – 2025