Rely tampon
1978-1980
Procter & Gamble introduced this super absorbent tampon with the slogan “it even absorbs the worry.” Little did they know that their product would cause a whole lot more than just worry: death. Rely was made with the new highly absorbent material carboxymethylcellulose. This also happened to be a highly toxic material. Women were leaving tampons in for much longer periods of time, which could cause a deadly bacterial infection called Toxic Shock Syndrome. Rely tampons became associated with death and illness, and were discontinued.
Additional info:
TheAtlantic - History of the tampon
The New York Times - Rely Tampon Recalled by Maker; Linked to Toxic Shock Syndrome; Refunds Are Offered Rely Brand Tampons Recalled Advice on Reducing Risk Data Called 'Limited'
The Washington Post - Tampon Mystery