Kihu, 20, broke the national 10,000m race walk record when he won silver behind Australia's Isaac Beacroft at the recently concluded Commonwealth Games, with Canada's Evan Dunfee taking bronze.
ADAK said Kihu tested positive for erythropoietin (EPO), a banned blood-boosting substance that increases red blood cell production and oxygen delivery to muscles.
The tests were conducted on June 30th while the Kenyan team was training for the July 23rd - August 2nd event.
The provisional suspension took effect on August 5th, and he could face a four-year ban if found guilty.
Kenya has provisionally suspended about 21 athletes for doping-related offences in 2026 alone, according to a list published by ADAK.
More than 140 Kenyan athletes, mainly long-distance runners, have been suspended by the Athletics Integrity Unit (AIU) since 2017 - more than those from any other country.