Mentha oil futures for April fell by Rs 13.50, or 1.33% to Rs 1,005.30 per kg in 494 lots.
At the Multi Commodity Exchange (MCX), the May contract traded lower by Rs 6.80, or 0.70% to Rs 969.60 per kg in 142 lots.
Prices fell as speculators booked profits amid sluggish spot market demand from consuming industries against adequate stocks position.