Clinical Research Directory

Inclusion Criteria: * having regular periods * being comfortable using silicone menstrual hygiene devices ("cup") * having giving consent in writing Exclusion Criteria: * use of an internal contraception method (hormone or non-hormone based) during or within three months before the study * pregnancy during or within three months before the study * amenorrhea (absent periods) during or within three months before the study * gynaecological intervention or surgery within three months before the study * hormonal treatment during or within three months before the study * absence of written consent * breastfeeding * medical treatment during the study * low (\< 18.5) or high (\> 30) body mass index (BMI)