An ingredient in weedkiller has been detected in a bottle of green tea sold at a Tokyo supermarket, and police and its manufacturer suspect the substance was deliberately mixed into the bottle, officials said Saturday. The incident involved a bottle of Healthya, a hit product made by Tokyo-based Kao Corp. touted as dissolving fat. A 43-year-old man in Nerima Ward who suffered minor diarrhea after drinking the tea told police the cap on the bottle appeared to be loose when he opened it. "We sincerely apologize for causing inconvenience and concern among consumers as well as distributors," Takuji Yasukawa, head of Kao's food and beverage business group, said at a news conference. "We will not recall the remaining unopened products on the market as we have confirmed none of them have any problems," he said. People involved in the probe said the substance was likely glyphosate isopropylamine salt, which is used in a weedkiller sold widely for use at parks and athletic fields. According to the Metropolitan Police Department, the man's wife purchased two bottles of the tea at the supermarket on March 26, and he drank one of them the next day without any problem. But when he tried the second one on March 31, he found it smelled like bleach and tasted bitter, the police said. He spat out the tea and later suffered minor diarrhea but did not seek medical attention, according to the police. He told Kao what happened, and the company tested the bottle, detected the weedkiller ingredient and informed the police. The amount of the chemical was small and would not have been fatal if the entire bottle had been consumed, according to the MPD. The MPD suspects somebody deliberately mixed the chemical into the bottle, police officials said. According to Kao, the bottle was one of roughly 330,000 produced on March 5 by Nippon Kajitsu Kogyo Co., a soft drink maker in the city of Yamaguchi with which it has entrusted production of the popular tea product. The bottles were shipped to the Nerima store March 20 via two distribution centers in Saitama Prefecture and were put on the shelves beginning March 21. Kao said the weedkiller chemical was not present on the production line. The company is urging consumers not to drink from bottles they suspect may have already been opened at the time of purchase, and will accept inquiries at 0120-50-1243.