20% off £35

Code:SAVE20
Vitamins & SupplementsVitamins & Supplements Shop AllHair, Skin & NailsCollagen & SilicaMuscle Support & Joint PainDigestive HealthMagnesiumFunctional MushroomsVitaminsShop all VitaminsMultivitaminsVitamin AVitamin BVitamin CVitamin DVitamin EVitamin KVitamin DrinksMineralsShop all MineralsMagnesiumIronZincCalciumSeleniumChromiumSupplementsShop all SupplementsFibre SupplementsAcidophilus & Friendly BacteriaPeppermint OilGrapeseed ExtractLecithinCollagen & SilicaOmega & Fish OilsPlant Sourced SupplementsSuperfood SupplementsArnicaApple CiderRaspberry KetonesAloe VeraChondroitin & MSMCo Enzyme Q10Evening Primrose OilGarlicGinkgo BilobaGlucosamineGlucomannanSeaweed, Kelps and Aquaceuticals5 HTPDigestive EnzymesSaw palmettoCharcoalConditionShop all ConditionCholesterolAllergy & Hay Fever CareAnxiety SupportBone & Muscle HealthMuscle Support & Joint PainBrain & Memory SupportWomen's HealthMen's HealthChildren's HealthCold & Immune SupportFatigueDigestive HealthHair, Skin & NailsHeart & CirculationLiver CareMood SupportSexual HealthSleep & RelaxationStress ReliefVisionWomen's HealthShop all Women's HealthPerimenopauseMenopauseMenstrual SupportUrinary Tract HealthPregnancy & ConceptionMen's HealthShop all Men's HealthProstate HealthChildren's HealthCBD Vitamins & SupplementsShop all CBD Vitamins & SupplementsCBD OilCBD CapsulesCBD GummiesHerbal & Licensed RemediesShop all Herbal & Licensed RemediesRescue RemedyAshwagandhaMilk ThistleGinseng & GuaranaHomeopathic & Flower RemediesShop all Homeopathic & Flower RemediesRescue RemedyTissue SaltsFlower RemediesHomeopathic RemediesAt-Home TestsVegan Vitamins & SupplementsHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inFood & DrinkFood & Drink Shop AllDried Fruit, Nuts & SeedsShop all Dried Fruit, Nuts & SeedsDried FruitNutsSeedsMixesChocolate CoatedHealthier SnackingShop all Healthier SnackingSweet SnacksSavoury SnacksLow Calorie SnacksChocolateCrisps & ChipsCrackers & CrispbreadsBiscuits & CookiesSnack BarsFlapjacksLiquoricePopcornSweets & MintsChocolate Coated SnacksTeas, Coffee & Hot BeveragesShop all Teas, Coffee & Hot BeveragesCoffee & Coffee SubstitutesMushroom DrinksHot ChocolateTeasSuperfood TeasMatcha & Green TeaHerbal TeaPeppermint TeaSleep & RelaxationSlimming TeaWomen's Health TeasSuperfoodsShop all SuperfoodsSuperfood BlendsSupergreensMoringa PowderSpirulinaMaca PowderFlaxseedBaobabChia SeedsGoji BerriesGut HealthDrinks & JuicesShop all Drinks & JuicesMultipack DrinksJuices & Health ShotsNatural Energy DrinksCoconut WaterKombuchaCBD DrinksSoft DrinksWaterAlcohol Free DrinksProtein ShakesFood CupboardShop all Food CupboardApple Cider VinegarCondiments & SaucesMeat-Free AlternativesSoup & Ready MealsRice, Pasta, Pulses & GrainsGravy, Broths & StockManuka HoneyBreakfast CerealsShop all Breakfast CerealsCereals, Bran & FlakesGranolaMuesliOats & PorridgeBreakfast BarsHoney, Jams & SpreadsShop all Honey, Jams & SpreadsManuka HoneyHoneyNut ButtersJams & ChutneysSyrupsSpreadsPateHome BakingShop all Home BakingBaking IngredientsBaking MixesBreadFlourSweeteners & Sugar AlternativesEgg SubstitutesCookingShop all CookingCooking IngredientsApple Cider VinegarCondiments & SaucesMeat-Free AlternativesSoup & Ready MealsRice, Pasta, Pulses & GrainsTinned FoodsHerbs, Spices & SeasoningGravy, Broths & StockVegan Food & DrinkShop all Vegan Food & DrinkMeat-Free AlternativesDairy Free DrinksEgg SubstitutesVegan ProteinVegan Protein BarsDairy Free DrinksNutritionally Complete FoodHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inSports NutritionSports Nutrition Shop AllProteinShop all ProteinWhey ProteinClear ProteinMass GainersVegan ProteinDiet ProteinCaseinCreatineShop all CreatineCreatine PowderCreatine CapsulesCreatine GummiesCreatine LiquidFlavoured CreatineSports SupplementsShop all Sports SupplementsFat BurnersAmino AcidsVitaminsTestosteroneGreensSports CollagenHydration & GelsShop all Hydration & GelsEnergy GelsElectrolytesNutritionally Complete FoodPre Workout & EnergyShop all Pre Workout & EnergyPre WorkoutCaffeine Free Pre WorkoutAmino Energy PowdersBars, Drinks & SnacksShop all Bars, Drinks & SnacksEnergy BarsProtein BarsProtein ShakesProtein SnacksAmino AcidsShop all Amino AcidsAmino Energy PowdersBCAAL-LysineGlutamineCarnitineArginineMeal Replacement ShakesVegan Sports NutritionShop all Vegan Sports NutritionVegan ProteinVegan Protein BarsVegan Pre Workout & EnergyVegan Amino AcidsVegan CreatineSports AccessoriesShop all Sports AccessoriesBottles & ShakersFitness EquipmentHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inBeautyNew inHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomBeauty Shop AllSkincareShop all SkincarePremium SkincareFace CareBody CareSun CareTanning & BronzingEye CareLip CareFoot CareHand & Nail CareSkin AilmentsSkin OilsCBD BeautyFace CareShop all Face CareCleanser & TonerFace MoisturiserFace Oil & SerumFace WashFace Exfoliators & ScrubsFace MasksHair CareShop all Hair CareShampoo & ConditionerHair ColouringHair MasksHair Oil & SerumHair AccessoriesHair Spray, Gel & MousseCollagen & SilicaHair, Skin & NailsSun CareShop all Sun CareSun Lotion SPFMineral Sun CareFace SPFAfter SunWashing & BathingShop all Washing & BathingShampoo & ConditionerBathing AccessoriesFeminine CareShower Gel & Body WashDeodorantDentalHand WashSoapBath Soak & OilBody ScrubBath Bombs & SaltsIncontinence SupportAromatherapy & HomeShop all Aromatherapy & HomePure Essential OilsBlended Essential OilsBase & Carrier OilsHolisticMother & BabyShop all Mother & BabyBaby Skincare & ToiletriesElectrical WellnessWeight ManagementWeight Management Shop AllFat Burners, Binders & Appetite SuppressantsShop all Fat Burners, Binders & Appetite SuppressantsFat BurnersFat BindersAppetite SuppressantsSlimming TabletsWeight Management Shakes Shop all Weight Management Shakes Meal Replacement ShakesDiet ProteinDiet Food & DrinkShop all Diet Food & DrinkSlimming TeasHealthier CookingLow Calorie SnacksFruit, Nuts & SeedsJuices & Health ShotsApple Cider VinegarExercise SupportShop all Exercise SupportFitness EquipmentMeal Replacement ShakesDiet ProteinProtein BarsHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inMedicines and HealthcareShop all Medicines and HealthcareHayfever & Allergy RemediesPain ReliefCough, Colds & Sore ThroatAntacids & GastrointestinalInfant & BabiesFemale HealthHaemorrhoids & Piles TreatmentsEar Care & Eye HealthFoot Care & Health Skin & ScalpMouth & Oral CareHair & ScalpTravelHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inVeganNew InTrendingThe best of Holland & BarrettEnd of Summer SaleSave up to 1/2 Price3 For 2 Mix & MatchOnline Only OffersFree Biotin when you spend £20Buy one get one 1/2 priceBuy 1 Get 1 FreeOutlet2 For £5 Mix & MatchWhile Stocks Last3 For £3 Mix & MatchShort Dated September 2025Shop all Health & WellnessJoints, Bones, & MusclesExercise & PerformanceEnergyGut HealthBrain HealthHeart HealthHair & Skin HealthWomen's HealthImmunitySleep & RelaxationChildren's HealthMen's HealthEmotional WellbeingEye HealthHolland & BarrettVitabioticsSolgarNew Leaf ProductsNovominsNew NordicBioglanWeledaNatures AidBetterYouEnd of Summer SaleSave up to 1/2 PriceOnline Only Offers3 For 2 Mix & MatchBuy one get one 1/2 priceBuy 1 Get 1 FreeOutletFree Biotin when you spend £20Gluten FreeDairy FreeSugar FreeSoya FreePalm Oil FreeSesame Seed FreeWheat FreeParaben FreeSLS FreeCelery FreeLion's Mane MushroomApple Cider VinegarReishi MushroomCollagenChaga MushroomArnicaMaitake MushroomAstragalusCastor OilCordyceps MushroomNew inArticlesAll articlesHealthFood & nutritionGut healthImmunityJoints, bones & musclesWomen's healthWellnessHair & skinMental wellbeingSeasonalSleep & relaxationSports nutritionRecipesAll recipesGluten freeLow sugarVeganDairy freePodcast
Skip to content

18+

Online only offer

Shop all Optimum Nutrition 

Optimum Nutrition Serious Mass Cookies & Cream 5.4kg

Exercise & Performance

For muscle and weight gain

1260kcal per serving

50g protein per serving

FREE Click & Collect!

Or, spend an extra 0 to get FREE Standard Delivery on your order.

Shop all Building Muscle

Per serving (336g)

Protein

50g

Energy

1265Kcal (376/100g)

Fat

6.9g (saturates 4g)

Carbs

250g

Salt

1.48g

Sugars

12g

  • SUPPORTS MUSCLE BUILDING & WEIGHT GAIN
  • 1,250 CALORIES* – HELPS BOOST CALORIE INTAKE
  • 50 g▲ SOURCE OF PROTEIN – HELPS BUILD AND MAINTAIN MUSCLE▪

Serious weight gain requires serious calories. However, those who need the extra calories most often have the toughest time consuming enough of them. For many aspiring to be bigger, a highly active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to consume enough calories through whole foods alone. Serious Mass is the ultimate in weight gain formulas.

With 1,250 calories per serving to boost daily calorie intake, 50g high protein to support muscle growth and repair, over 250g carbohydrates helping support muscle recovery , and now with 3g added Creatine to support performance per serving, you’ve got nothing to lose and lots to gain. It is time to stop thinking small and get serious – SERIOUS MASS®

Full ingredients

Corn, Maltodextrin, WHEY Protein Concentrate [MILK] (Emilsifier: Lecithin [SOY]), Flavourings, Cookies Crumb (1.5%) (WHEAT Flour [GLUTEN], Sugar, Vegetable Fats: Palm, Rapeseed; Fat-Reduced Cocoa Powder, Salt), Creatine Monohydrate, MILK Mineral Complex, Salt, Minerals (Magnesium, Iron, Zinc, Manganese, Fluoride, Selenium, Iodine, Copper, Molybdenum, Chromium), Vitamins (C, E, B3, A, B5, B7, B12, B9, D, B6, B1, K, B2), Stabilisers (Cellulose Gum, Guar Gum, Carrageenan), Sweetener (Sucralose). For allegens - see ingredients in bold

May contain eggs, nuts, and peanuts.

For allergens, see ingredients in bold.

Always read the label before use

Per 100g / Per 336g Serving
Energy 1575kJ / 5292kJ / 376kcal / 1265kcal
Fat 2.1g / 6.9g
of which saturates 1.2g / 4.0g
Carbohydrates 74g / 250g
of which sugars 3.6g / 12g
Protein 15g / 50g
Salt 0.44g / 1.48g
Vitamin A 198 μg / 666 μg
Vitamin D 1.2 μg / 4.2 μg
Vitamin E 2.7 mg / 9.0 mg
Vitamin C 19 mg / 63 mg
Vitamin K 22 μg / 75 μg
Thiamin 0.27 mg / 0.90 mg
Riboflavin 0.34 mg / 1.1 mg
Niacin 4.0 mg / 13 mg
Vitamin B6 0.34 mg / 1.1 mg
Folic Acid 44.6 μg / 150 μg
Vitamin B12 0.56 μg / 1.9 μg
Biotin 12 μg / 40 μg
Pantothenic Acid 1.3 mg / 4.5 mg
Calcium 227 mg / 764 mg
Phosphorus 155 mg / 522 mg
Magnesium 83.8 mg / 282 mg
Iron 4.2 mg / 14 mg
Zinc 4.2 mg / 14 mg
Copper 0.30 mg / 1.0 mg
Manganese 83.8 mg / 282 mg
Fluoride 0.87 mg / 2.9 mg
Selenium 16 μg / 55 μg
Chromium 10 μg / 34 μg
Molybdenum 12 μg / 42 μg
Iodine 44.7 μg / 150 μg
Creatine 0.9 g / 3.0 g

Advisory Information

May contain eggs, nuts, and peanuts.

To be used in the framework of a

varied and balanced diet and a healthy lifestyle.

Suitable for:

Not for use by those with pre-existing medical conditions or those taking any medications, those under the age of 18 or women that are pregnant or breast-feeding.

Remember to:

We go to great efforts to ensure that the information on this page is accurate at the time that the page was last edited. As we are constantly reviewing and developing our products to meet our consumer needs, consumers, particularly those that suffer from allergies and intolerances, should always check product labelling, warnings, and directions provided with the product that is delivered, prior to use or consumption.

Directions:

Add 336 g (~ 2 heaped scoops) to a blender filled with 710 ml of water. Blend for 30-45 seconds.

Store in a cool, dry place.

Filter by stars

Customer reviews below are moderated for offensive content only. They are not medical advice, should not be relied upon, and are not endorsed by Holland & Barrett. For health issues or product suitability, consult a health professional. Products are not medicinal unless stated otherwise. Find out more

Best of the best

5 stars

Verified Purchaser

Good quality protein and so smooth when you drink it

Kif - 1 month ago

Mass gainer

5 stars

Verified Purchaser

Son loves the flavour ! And good value for money

Janine - 3 months ago

Gainer

5 stars

Verified Purchaser

Good flavour

Sasha - 5 months ago

Compare similar products

This product

Optimum Nutrition Serious Mass Cookies & Cream 5.4kg
Price

Current price: £58.00

£1.07/100 g

Rating

4/5

Flavour

Cookies & Cream

Quantity and format

5400 g

Suitable for

-

Ingredients

Compare products

Select up to 3 similar products to compare

Our promise

We go to great efforts to ensure that the information on this page is accurate at the time that the page was last edited. As we are constantly reviewing and developing our products to meet our consumer needs, consumers, particularly those that suffer from allergies and intolerances, should always check product labelling, warnings, and directions provided with the product that is delivered, prior to use or consumption.

Sign up for exclusive offers

Plus, get expert advice to support your health & wellness straight to your inbox when you sign up to Holland & Barrett emails.