The AIU said on Twitter that Kipruto had been suspended "for the use of a Prohibited Substance/Method (ABP)."
The AIU added that a notice of the charge has been issued to the 23-year-old runner.
ABP refers to the Athlete Biological Passport, which shows discrepancies that can reveal the effects of doping.
Kipruto, who also won a 10,000m bronze medal in the 2019 world championships, broke the 10-km road race world record in 2020.
