This could be because of age, lack of egg production, a history of STI's, problems with the uterus or the fallopian tubes, hormonal imbalances, early menopause, and having excess tissue around the reproductive organs (endometriosis). (myhopewell.com)
Last fall, Unilever filed a civil action against the startup, alleging false advertising and unfair competition because of Just Mayo's lack of eggs. (fortune.com)
Maybe this was due to the lack of egg, or too much leavening? (snixykitchen.com)