Pharmacokinetics of creatine

Area of Science:

• Pharmacology
• Physiology
• Nutritional Science

Background:

• Creatine supplementation is recognized for therapeutic benefits in muscle and neurological function.
• Limited understanding exists regarding creatine disposition following supraphysiologic doses.
• Transport processes govern creatine absorption, kidney clearance, and tissue access.

Purpose of the Study:

• To investigate the disposition of creatine after supraphysiologic doses.
• To understand how repeated creatine dosing affects its clearance.
• To explore factors influencing creatine uptake and absorption.

Main Methods:

• The study reviews existing literature on creatine pharmacokinetics.
• It examines the impact of repeated dosing on creatine clearance.
• It discusses the role of insulin and carbohydrate intake on creatine disposition.

Main Results:

• Repeated creatine doses lead to decreased clearance, primarily due to skeletal muscle saturation.
• Insulin and insulin-stimulating foods enhance muscle creatine uptake.
• High carbohydrate meals may delay intestinal creatine absorption.

Conclusions:

• Creatine disposition is influenced by transport mechanisms and saturation of muscle stores.
• Understanding creatine pharmacokinetics is crucial for optimizing dosing in clinical trials.
• Further research is needed on creatine disposition in special populations like the elderly and those with neuromuscular diseases.