Tranexamic acid
"I used to have super heavy periods, where even standing up would be an issue (now have bloodstains all around the house from leaking) and I would leak through super plus tampon and super night pad together after just an hour, now my period is 'normal' I wouldn't call it light cause it's still not light I think but it's just normal like other people's periods and I think it is FAB! and I would recommend this to any fellow lady with crazy mental periods because I've not leaked since! wooooo ((however cramps have slightly worsened))"