Abstract: A menstrual cup is described having a main body to hold menstrual fluid. The main body comprises a plurality of segments that are connected along fold lines. The main body is moveable between an expanded state and a collapsed state. The main body folds along the fold lines when moving between the expanded and collapsed states, and the segments project outwardly beyond the fold lines when the cup is in the expanded state. Also described is a menstrual cup having a main body to hold menstrual fluid, and a rim to engage a vaginal wall when the cup is inserted into a vagina. The rim is provided at an open end of the main body and is undulated.

Abstract: Phosphatidylalkanol homologues having isotopically labelled moieties, methods for preparation of isotopically labelled phosphatidylalkanol homologues and uses of isotopically labelled phosphatidylalkanol homologues.