Kwas guanidynooctowy jest prekursorem niezbędnej do budowy mięśni kreatyny i fosfokreatyny. Jest związkiem naturalnie występującym w organizmach zwierząt i ludzi oraz związkiem otrzymywanym na drodze syntezy chemicznej. Związek ten jest zarejestrowany w krajach Unii Europejskiej jako dodatek paszowy należący do kategorii dodatków dietetycznych, grupy funkcjonalnej aminokwasy, ich sole i analogi.

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