I am a breastfeeding mother and i want to know if it is safe to use Creatine? Is Creatine safe for nursing mother and child? Does Creatine extracts into breast milk? Does Creatine has any long term or short term side effects on infants? Can Creatine influence milk supply or can Creatine decrease milk supply in lactating mothers?

Answer by DrLact: About Creatine usage in lactation

Creatine is used as a dietary supplement to increase muscle mass and improve exercise performance. Although creatine is a normal component of human milk, milk levels of creatine have not been measured after exogenous administration in humans. Creatine is converted into creatinine in the mother's and infant's bodies. It may increase the infant's serum creatinine, which may alter estimations of the infant's kidney function.[1] Some authors speculate that creatine supplementation of nursing mothers might help avoid creatine deficiency syndromes, but no studies are available that test this hypothesis.[2] Until more data are available, it is probably best to avoid creatine supplementation unless it is prescribed by a healthcare professional.
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