Men with fertility issues have lower levels of phosphate in the blood than average, according to research presented at the first Joint Congress between the European Society of Pediatric Endocrinology (ESPE) and the European Society of Endocrinology (ESE). In addition, low phosphate concentrations in the blood were associated with reduced sperm motility in infertile men. The findings can help researchers improve the understanding of the biological factors involved in male reproductive health, which could lead to new fertility treatments.