At the Multi Commodity Exchange, mentha oil for delivery in September gained Rs 2.10, or 0.29 per cent, to Rs 724.50 per kg in a business turnover of 57 lots.
Similarly, the oil for delivery in August added Rs 1.80, or 0.25 per cent, to Rs 711.60 per kg in 196 lots.
Marketmen said a firming trend at spot market on tight supplies from Chandausi in Uttar Pradesh against rising demand, mainly kept mentha oil prices up at futures trade.