Overload

Overloads are potions which combine the boosting properties of extreme attack, extreme strength, extreme defence, extreme ranging, and extreme magic potions. Requiring 96 Herblore to produce, overloads have the highest Herblore level requirement to make among potions in the game, excluding a few high-level strong potions within Daemonheim.

Overloads are created by combining 3-dose extreme attack, extreme strength, extreme defence, extreme ranging, and extreme magic potions with a clean torstol. The process grants 1,000 Herblore experience. It is possible to make these potions at level 90 herblore with the aid of a spicy stew (with brown spice) although getting the +6 level boost is extremely rare. It is recommended not to start making them until level 96 as with no distractions and without the need to reapply the stew's boost every couple minutes it's possible to achieve 540,000xp/hour. The cost of making an overload potion (3) from pre-purchased "super potions" is or  per dose. Four empty vials will be left over afterward. The Assist System cannot be used to produce overloads.

Overloads boost Attack, Strength, Defence, Ranged, and Magic by 3 + 15% of the stat level, for a maximum of +17 at level 99. The increase to the Damage stat in Equipment stats is +1 for each boosted level (+1.5 with a 2h weapon), but the effective damage increase is far higher. This boost is affected by other damage modifiers such as the effects of the Void Knight equipment set, abilities, and the hidden damage modifier on abilities based on weapon speed (see Ability book).

On top of the +17 damage that overloads give that varies with other damage modifiers, for every level that they boost, overloads also provide a +8 damage boost, which is added on after every other damage modifier has been calculated. With the aforementioned +17 boost to your stats, overloads provide a static +136 damage to all attacks, which is unaffected by any damage boosts such as the 10% from Void Knight equipment, or (when using abilities) the penalty modifiers abilities have based on weapon speed.

This boost is repeated every 15 seconds for 5 minutes. It is a popular misconception that overloads will fully restore a player's stats every 15 seconds. This is untrue, as overloads simply reapply their boosts every 15 seconds. This property is useful to players who are using Saradomin brews to restore lifepoints, as the overload's frequent boosts help to counter the Saradomin brews' stat drain. After the five minutes is up, the overload's stat boosts will wear off entirely.

After the Evolution of Combat update, overloads can now be used in the Wilderness.

Flask
This potion can be made into an overload flask by using at least six doses of it with a potion flask. Players do not need a specific level to turn potions into flasks, but since all untradeable potions must be made by the player, the flasks actually have the same level requirement as the potion itself.

Trivia

 * When first released, overloads could be used in PvP areas, but within 48 hours, this was changed so they cannot be used in any PvP situation, dangerous or safe. This decision has sparked some controversy, as some players believe that extremes and overloads should be available in the Wilderness. Mod Mark has replied that the potions are unavailable in PvP because Herblore level does not affect combat level; players may therefore be misled and think that a potential target is weaker than they are. However, as of 17 November 2009, overloads, along with all other untradeable potions, can be used in safe PvP minigames.
 * As of 20 November 2012. Overloads, along with other untradeable potions, can be used in the Wilderness and unsafe pvp.
 * Before the release of Evolution of Combat, Overloads had a larger boost and cost 500 lifepoints to use. Attempting to drink a dose of overload with fewer than 500 life points results in the message "You need more than 500 life points to survive the power of overload."
 * According to Jagex, it "racks the body with spasms and burns the digestive tract".
 * While combining extreme potions to produce an overload results in 1,000 Herblore experience, each overload is technically worth at least 2,201 Herblore experience, due to the necessity of brewing the extreme potions. The maximum amount of experience that each overload can be worth is 2,911, assuming all herbs are not grimy and all potions are made from scratch.
 * Some players drink a dose of overload right before entering a dungeon at Daemonheim alongside Prayer Renewal, as the effect of the potions will carry on into the first five minutes of the dungeon, giving them a huge advantage in the dungeon by boosting their stats and letting them open doors and solve puzzles that normally they'd have to make a potion for. This is usually best for large and medium size dungeons where the price of the overload saves you time in the dungeon, which you could use to make the money back. In smalls they are still very useful but it is expensive to drink a overload after every one or two dungeons.
 * The combined cost of an overload potion (3) from scratch is or  per dose.