ᵃAbbie E Smith-Ryan et al: "Creatine characteristics vary between males and females, with females exhibiting 70–80% lower endogenous creatine stores compared to males.",(2021)

ᵇAbbie E Smith-Ryan et al: "Creatine supplementation among pre-menopausal females appears to be effective for improving strength and exercise performance. Post-menopausal females may also experience benefits in skeletal muscle size and function when consuming high doses of creatine (0.3 g·kg−1·d−1); and favorable effects on bone when combined with resistance training.", (2021)

ᶜKaviani M et al:"Creatine is naturally found in animal tissues such as meats, fish, and poultry. As a result, there is decreased intake among vegetarian athletes. Dietary intake of creatine is significantly reduced in individuals following a vegetarian diet (egg and dairy products may contribute to provide very small amounts of creatine), while in vegan diets, almost no exogenous source of creatine is consumed."(2020)