If you were looking for the article about the drink with a similar name, then see Kelp juice.
If you were looking for the article about the restaurant, then see Kelpshake.

A Kelp Shake is an addictive and potentially toxic soft drink served in the Kelpshake restaurant chain. They debut as the main plot of the episode "Best Frenemies," and later also make a cameo in "The Nitwitting."


The drink comes in a light green bottle with a light yellow lid and light yellow straw, and on the bottle is a bright yellow label that reads the drink's name in red text.


It is eventually proven by Karen that the drink is 99% kelp juice and the remaining percentile is an unknown radioactive material that, at the end of the episode, is revealed to make the consumer grow green hair on their entire body.

Side effects

At the end of the episode, SpongeBob, Mr. Krabs, and Plankton are the only ones seen being the victims of the Kelp Shake. However, since almost everybody else in town drinks one, they all suffer the same symptoms.

The body-changing side effects of the beverage cover the entire body in fuzzy kelp similar to a gorilla's fur and their clothes vanish as the fuzzy kelp grows all over their bodies. For some odd reason, however, it takes everybody except for Mr. Krabs and Plankton about two days to grow green hair.

Because of these symptoms, the authorities order the complete shutdown of all of the Kelpshake restaurants and proceed to dispose of the dangerous chemicals used to produce them.

Role in series

"Best Frenemies"

The drink was very popular and tasty as Plankton described it as having "a pungent aftertaste." However, Mr. Krabs describes his first sip of it as tasting like a "wet gym sock" before the flavor kicks in. At one point it is so popular that restaurants are on each block of Bikini Bottom. It has a chemical that can turn anyone's skin into fuzzy kelp.


It is one of the items that the player can bring to SpongeBob.

Cooking Contest

The Kelp Shake is one of the drinks to make.

"The Nitwitting"

A Kelp Shake is seen at Larry's Gym on Larry's treadmill as he is running, then getting crushed by a member of the Empty Head Society.


Kelp Shakes on the Galley Grub menu in "Mermaid Man and Barnacle Boy V."

  • Kelp Shakes are listed on the Galley Grub menu inside of the Krusty Krab in "Mermaid Man and Barnacle Boy V" and ironically contradicts the logic of the Krusty Krab banning Kelp Shakes in "Best Frenemies."
    • However, it is very likely that the Kelp Shake seen on the Krusty Krab menu is a different variant than the one seen in "Best Frenemies."

A different Kelp Shake, seen on the menu in the second movie

Food and drinks (VE)
Krusty Krab: Jelly PattyKrabby PattySaladSeahorse radishMayonnaiseMustardKrusty Krab PizzaRusty on RyeMonster Krabby PattyPretty PattyWow! SoupKrabby NewburgTartar sauceKelp friesCoral bitsPaper PattySpongy PattiesNasty PattyKrusty DogSecret PattyKing-Size Ultra Krabby SupremeKrabby Patty creaturesSynthetic Krabby PattyPicklesPattyPatty PalTangy Sponge SauceMild Bobby SauceDouble Triple Bossy DeluxePipsqueak PattyKrusty ChumHatty PattySecret Krabby SauceKrabby PâtéVeggie PattyDeluxe Krabby PattyExecutive TreatmentAged PattyKrabby Patty (character)Free Sample Krabby PattyGiant Krabby PattyEmergency Krabby PattiesFrozen Krabby PattyDanger PattiesNight PattyGreat pacific garbage patchKrusty Kid's Meal
 Chum Bucket: Chum FricasseeChumstickChum Bucket SupremeChum PattiesChumRaw SewageChumsicleChumbalayaChumburgerChum nuggetsCrispity Crunchities
Other: Chocolate barDonutSquidward's souffléSpongeBob's sundaeSwedish Barnacle BallsCanned BreadCanned CoralBarnacle loafBon-bonsBran FlakesMermaid Man and Barnacle Boy Bran FlakesHolographic meatloafKelp ChipsKelp JerkyKelp Nougat CrunchKelp ShakeSeanut BrittleYummy BunzDrinkable SausageVolcano SauceMilkshakePeasTeaChocolate balloonJellyfish jellyStrawberry ice creamTriple Gooberberry SunriseYellow popsicleSweetie Patrol CookiesKelpoNature PattyBarnacle ChipsPlab PattySea-Nut ButterSnail FudChopped liverMarsh KingFortune cookiePatchy PattyStrongman PowderExploding pieSeaberry pieGrandma's cookiesSnail BitesSalsa ImbecilicusFlabby PattySorry about the Scabies cakeNutty ButterNachosFruitcakeLonely KrabHogan DüpKrabby Patty in a CanSnail-PoAmoeba TreatsPepperHash brownsSandy's birthday cakeSpaghettiProtein power shakeKrabby SoupQuasi-Gummy Chewy Candy FishFish sticksSquidward the Ice Cream ConeCheese FizzIndian Ocean sea grassRainbowgerPineapple GaryFizz Bomb ColaBubbly waterKelp juiceMilkBloodDiet BloodSponge cakeGreaseCrispity CrunchitiesPizza PattyBurrito PattyNoodle PattySponge PattySeaweed noodle stewSnail NipPopsicCreamBob ConePantsSherbetSwirl FudgeSundae CheeksChipRocky RoadKelpPopsicle twinsCherryTub of vanilla ice creamDelicious dairy treatDonut demonAngel donutDevil donutRare Fruit of the Kazook TreeChocolate syrupSprinkleHeavenly ParadiseSlimycan Snail FoodSea PeanutsPrune ice creamJelly beansGoober MealRoast à la SquidwardHot sauceBlack lemonadeIce creamSea BiscuitsSecret formula anniversary cakeFrankenstein Fish FoodStrawberry ice cream sandwichLucky peanutLollipopKelp cheeseWaterSugar Squeeze
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