A couple who struggled through years of secondary infertility, including seven miscarriages and four rounds of IVF, have developed a new supplement they claim will "turbo charge" men's sperm.
But a leading fertility specialist says Vitamenz is unproven and should be properly tested before being sold to couples trying to conceive.
Aaron and Jacinta Gascoigne fell pregnant with son Jack, now 7, in their early 30s but when the Auckland couple tried for number two they suffered repeated miscarriages.
Their first attempt at in-vitro fertilisation was unsuccessful and the couple were dismayed to find they were producing middle to low-quality embryos.
Tests revealed Mr Gascoigne, now 41, had low motility (slow-moving) sperm. Doctors also discovered Mrs Gascoigne, 37, had a parasitic worm known as bilharzia living inside her for almost a decade, which probably caused the miscarriages. One pill killed the parasite.