Supreme strength potion

The supreme strength potion is a six-dose combination potion that can be made at level 93 Herblore after buying the recipe for 500,000 coins from Lady Meilyr (you do not need to find this recipe in Daemonheim). It is made by combining a super strength (4) and an extreme strength (4) in a crystal flask, giving 266.3 experience.

A dose of supreme strength boosts Strength by 16% of your Strength level, plus 4, rounded down; this provides an additional 2 levels over extreme strength at level 99 for a final level of 118.