Choosing between food and sanitary products is not a choice any woman wants to face.
But homeless and vulnerable women have told ITV News Central that's exactly what's happening to them.
Video report by Charlotte Cross:
Among the women accessing services at SIFA Fireside in Birmingham, a charity which helps homeless and vulnerably-housed people, is Natalie White.
An abusive relationship forced her onto the streets, and she slept rough for two years. It means she knows first-hand the unique challenges faced by women struggling to get by.
She used to have to make the choice between buying food, or buying sanitary products.
SIFA Fireside welcomes around 160 people each day, giving them shelter, a hot meal - and for women, free access to towels and tampons.
So-called period poverty is a growing problem among homeless women and those on low incomes, and overcoming the taboo of talking about periods is part of the challenge.
Kathy Mayer, another of SIFA’s long-term visitors, said embarrassment played a big part in preventing women asking for help.
“I myself am a very clean person, and I think one of the most awful things is that you haven’t got proper facilities and proper things,” she said.
“I think that’s awful because it’s very depressing and very embarrassing.”
A campaign has now been launched by students at King Edward VI High School for Girls in Edgbaston, raising awareness, money and donations.
They’ve already raised more than £400, as well as as dozens of boxes of donated towels and tampons.
Zahra Asif, one of the students behind the scheme, said the response had been “overwhelming”.
“We thought we’d only get maybe a couple of bags - but we’ve had so many from students, teachers, and from the boys’ school next door too,” she said.
Principal Ann Clark has given the campaign her full backing - and said they are now hoping it helps raise awareness of other issues too.
“We should be looking at VAT on sanitary products and maybe girls on free school meals, maybe they should be provided sanitary products free,” she said.
“There are issues around some girls who won’t go to school during their period because they can’t have adequate sanitary protection, which shouldn’t be the case in this country - to have something like this affecting girls’ education.
“I’m hoping, more broadly, that politicians will stop and take notice and there will be more campaigning around this issue.”