Association between dietary intake of creatine and female reproductive health: Evidence from NHANES 2017–2020

The hormonal changes in women influence creatine dynamics, emphasizing its potential importance during menstruation, pregnancy, postpartum, menopause, and postmenopause. Yet, limited research explores creatine's impact on female reproductive health at the population level. Our study investigated the relationship between dietary creatine intake and reproductive health indices in US women using data from the 2017-2020 National Health and Nutrition Examination Survey (NHANES). We extracted a dataset containing females aged 12 years and above who provided details about their reproductive health and dietary habits. Daily creatine intake was quantified as a relative amount (mg per kg body mass) and did not include creatine from dietary supplements and pharmacological agents. A daily requirement for dietary creatine for healthy women was employed to classify respondents into two separate subpopulations: (1) suboptimal intake of creatine (<13 mg per kg body mass per day) or (2) recommended intake (dietary creatine ≥ 13 mg per kg body mass per day). A total of 4522 female participants from the NHANES study (age 44.5 ± 20.5 years) provided data on their reproductive health and dietary intake. The average daily creatine intake for the group was 10.5 ± 10.8 mg per kg body mass. The odds ratio for having irregular periods in women consuming ≥13 mg of creatine per kg body mass daily (recommended intake) compared to those with suboptimal intake was 0.75 (95% CI, from 0.66 to 0.86), indicating a significant association between higher intake of dietary creatine and lower risk of oligomenorrhea (