This study was conducted according to the guidelines laid down in the Declaration of Helsinki. Of 1663 health check-up examinees aged 60, 63, 66, and 69 y (95.7% males), 1574 males agreed and filled out the questionnaires. In each fiscal year, we invited participants aged 60, 63, 66, and 69 y (as of March 31, the last date of the fiscal year) to answer 2 questionnaires on overall health-related lifestyle and dietary habits, enabling us to cover those aged 60–69 y over the 3-y baseline period. Data for this cross-sectional study were obtained from the baseline survey of the Hitachi Health Study II, an ongoing prospective study of current and former employees and their spouses of Hitachi, Ltd., Japan 24,25. These served as valuable tools in evaluating the methodological rigor, validity, and reliability of each study. Out of the 18 articles selected for quality assessment, seven were randomized controlled trials (RCTs), three were systematic reviews, one was a Mendelian randomization (MR) analysis, one was a post hoc analysis, and six were cross-sectional studies. The selection of these articles was achieved through consensus between the two authors NRM and NK involved in the study. To determine the studies to be included, we established explicit inclusion and exclusion criteria, and extensive discussions were held among all authors to reach a consensus. In this study, we adhered to the rigorous and transparent guidelines set forth by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) to ensure the integrity of our review. The shared membership of VDR and testosterone in the nuclear receptor family underscores the significance of understanding their interaction. These findings suggest that vitamin D may potentially influence fertility, prompting further investigation into its wider physiological consequences. Due to modern-day farming practices, in addition to western diet statistics, it is recommended to supplement your diet with a multivitamin to bridge any dietary gaps with essential micronutrients. Consider getting a blood panel done first and consult your physician, to identify what micronutrients you need for optimal hormonal balance. Vitamins and minerals like Vitamin D, Zinc, Magnesium, and B-Vitamins act as critical co-factors for hormonal health and performance. ⚠️ While DHEA is available over the counter in some countries, it’s important to monitor levels closely under medical supervision, especially for women, due to its androgenic potential. However, a study suggests its potential role in enhancing male fertility. Vitamin B7 is well known for keeping the nervous system healthy and regulating metabolism. According to study published in PubMed, biotin treatment of biotin-deficient adult rats has improved their testicular function . Vitamin B5 is also essential for producing red blood cells, which carry oxygen throughout the body. These nutrients collectively create an environment conducive to maintaining optimal testosterone levels. Therefore, while sea moss may support overall health, its impact on testosterone should be considered as part of a broader dietary and lifestyle approach. As interest in natural health supplements grows, understanding the true benefits of sea moss is essential for making informed decisions about its use.