Axeman's potion

Axeman's Potion can be made with Herblore level 40, the ingredients you'll need is Maple Roots and Wergali. It can be bought for 1200 gp at the Grand Exchange or bought from Woodcutter's Guild for only 1000 gp. It has an colour similar to brown. It will boost your Woodcutting level by 2 if under 40, 3 if between 41 and 69, 4 between 70 and 99. It was Michael, the guildmaster of Woodcutter's Guild who discovered how to make the potion.