Infertility, the failure to achieve clinical pregnancy after 12 months or more of regular unprotected sex, affects 15-25% of couples in Western countries. It is estimated that reduced fertility (subfertility) affects twice as many couples. Factors that affect human fertility are: diet, genetic predisposition, health status, age, physical activity, psychological factors, recreational and medicinal substances and environmental factors. Many of them are changeable. The use of dietary supplements for the purpose of improving fertility in both sexes is becoming more and more common. The aim of this study was to examine the use of dietary supplements and lifestyle changes in couples preparing for pregnancy. For the purposes of the paper, a questionnaire was created that was distributed through social networks. The conclusion of the paper is that the number of women currently working on pregnancy (67.3%) correlates with the number of those who use multivitamin/mineral supplements (75%), which are important in preparing the body for pregnancy and reducing the risk of developing neural tube defects. Significantly more women (99%) than their partners (49.8%) use dietary supplements. In addition, the number of women diagnosed with PCOS (34.1%) correlates with the percentage of inositol users (35%) which has evidence of improved fertility and symptoms of PCOS and Lady's mantle (22.9%), which is characterized by traditional use for this diagnosis. The percentage of partners of respondents who have some disorder of sperm morphology, number or motility (30.1%) correlates with the percentage of those who use multivitamin/mineral supplements (29.3%) which have evidence for improving spermiograms.