Lots of different types of period products claim to be eco friendly, from menstrual cups to period pants and reusable pads. But how do their environmental credentials stack up? That's what listener Sam wants to know - and she's not the only one asking about not just the impact of these so called sustainable period products on planetary health, but also on women's health too. Joining Sam and Greg for this one are Natalie Fee, founder of the non profit City to Sea, who campaigns for "plastic-free periods", and Dr Nicola Tempest, a senior lecturer in gynaecology at Liverpool University. And if you've seen something promising to make you happier, healthier or greener and want to know if it is SB or BS please do send it over on email to [email protected] or drop us a message or voicenote on Whatsapp to 07543 306807 PRESENTER: GREG FOOT PRODUCER: TOM MOSELEY