Palm oil prices had were earlier traded within a range, with the competing forces of expectations for bullish industry data and weakness in soyoil and crude oil prices.
Malaysia's palm oil stockpiles at the end of May dropped 10.3pc from the previous month to 2.45 million tonnes, industry regulator the Malaysian Palm Oil Board said on Wednesday.
Production in May rose 1.3pc month-on-month to 1.67 million tonnes. Exports climbed 3.5pc from April to 1.71 million tonnes last month, the MPOB data showed.
The benchmark palm oil contract for August delivery on the Bursa Malaysia Derivatives Exchange was last down 1.8pc at 1,971 ringgit ($474.37) per tonne at the close of trade, its sharpest daily decline in a week.
It earlier fell as much as 2.1pc to 1,964 ringgit, its lowest level since May 13.
"Market gains earlier were capped by weaker external markets," a futures trader in Kuala Lumpur said, referring to CBOT US soyoil, adding that the market's subsequent decline was due to sharper soyoil falls.
The Chicago July soybean oil contract, which had fallen 0.6pc on Tuesday, was down 0.8pc.
Meanwhile, the September soyoil contract on the Dalian Commodity Exchange fell 1pc and the Dalian September palm oil contract eased 1.1pc.
Palm oil prices are affected by movements in related edible oils, with which it competes for global market share.