Dwarven stout

There is also the Mature dwarven stout.

The Dwarven Stout is a drink which boosts a player's Mining and Smithing, though it seriously addles the melee combat skills. It is sold at the Rising Sun Inn in Falador, the King's Axe Inn in Keldagrim, the Burthorpe Games Room and the Toad and Chicken in Burthorpe. While it can be found under White wolf mountain, it can also be brewed. The effects of drinking the Dwarven Stout can last as short as a second or as long as a minute.

An interesting fact about the dwarven stout is that while it costs 3 coins to buy in Falador, they sell for over 70gp each at the Grand Exchange. They also sell fairly quickly, making this a possible method to earn small amounts of money in a short amount of time, although not the most efficient method since it takes a lot of clicking.

Effects
It is possible to enter the Mining Guild after drinking a Dwarven Stout if a player has level 59 mining. The positive effects of the stout do not stack, but the negative effects do - meaning that regardless of how many stouts are imbibed in a row, the player will only see a maximum boost of +1 to their Mining & Smithing skill; conversely, drinking many stouts in succession will soon leave the player with Attack, Strength and Defence at zero.
 * Increases Mining and Smithing level by 1 temporarily
 * Lowers Attack, Strength, and Defence by 2-7 (skill drops approximately 2 + 5% of skill level)