Optimum Nutrition
MyCore Supplements stocks the largest range of Optimum Nutrition products in Ireland. The Optimum Nutrition range includes the world famous Gold Standard Whey Protein, Serious Mass Weight Gainer, Amino Energy, Pre-Workout, Opti-Men & Opti-Women Vitamins as well as Fish Oils and other products to help you achieve your goals.
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The world’s best selling whey protein. It delivers 24 g of whey protein to support muscle growth. -
Sale!
- Adding Calories Has Never Been This Easy or Tasted So Good
- 1,250 Calories
- 50g Protein
- Over 250g Carbohydrates with NO ADDED SUGAR
- Creatine, Glutamine and Glutamic Acid
- 25 Vitamins and Essential Minerals
FREE – Optimum Nutrition Shaker + Optimum Nutrition Creatine 187g
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Sale!
Pick one of the following to bundle with your 2.2Kg Tub of Optimum Nutrition Gold Standard Whey: -
- 18g High Protein
- 20g Collagen Per serving
- Sugar Free
- Fat Free
- 72cals
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- 100mg of caffeine - increase mental focus & alertness.
- 5g amino acids, including BCAAs.
- Zero Sugars - just 29 cals.
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- 20 g of premium-quality plant protein per serving
- 3.6 g of naturally occurring BCAA amino acids per serving
- Zero sugar
- 100% vegan ingredients
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- Muscle & Joint Support*
- 10 g of whey protein isolate per serving
- 10 g of collagen peptides per serving
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- Increase performance during high intensity training.
- 2.5 g of pure Creatine Monohydrate.
- Two servings a day has been proven to increase muscle power during high intensity exercise.
- Take 2 capsules with your three main meals.
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- Increase performance during high intensity training.
- 3.4 g of pure Creatine Monohydrate to increase muscle power.
- Mixes easily with no gritty taste.
- Mix with water, juice or your ON shake.
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- Increase performance during high intensity training.
- 3.4 g of pure Creatine Monohydrate to increase muscle power.
- Mixes easily with no gritty taste.
- Mix with water, juice or your ON shake.
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- Increase performance during high intensity training.
- 3.4 g of pure Creatine Monohydrate to increase muscle power.
- Mixes easily with no gritty taste.
- Mix with water, juice or your ON shake.
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Sale!
- For intense training sessions
- Delivers key electrolytes—400 mg sodium, 113 mg magnesium, and 300 mg potassium per serving
- Helps support hydration and muscle function* after heavy sweating.
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Out of stock
- 5 g L-Glutamine per serving
- Take at any time
- Unflavoured powder
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Support Muscle Growth & Repair Overnight.
24 g of Pure Micellar Casein but just 0.5 g of fat and no added sugars.
- Before Bed
- Slow Digesting
- Supports Muscle Growth & Maintenance
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- Hydrolyzed & Ultra-Filtered Whey Protein Isolate
- 1 Gram of Carbs Per Serving
- 5.5 G BCAAs
- 4.3 G Glutamine & Glutamic Acid
- 11.4 G Essential Amino Acids
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- 24 Grams of Organic Plant Protein Per Serving
- Complete Profile of Essential Amino Acids
- 4 Grams of Naturally Occurring BCAAs
- 4 Grams of Naturally Occurring Glutamine
- 100% of the Daily Value for Vitamin C
- Outstanding Flavor & Mixability
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- 5 g BCAAs in 2:1:1 ratio
- Magnesium and vitamin C to reduce tiredness and fatigue
- Unique formula - contains Rhodiola rosea, Wellmune® and a blend of electrolytes.
- Banned substance tested
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Unleash energy, power and performance.
30 Serving175 mg Caffeine 1.5g Beta Alanine 3g Creatine -
Sale!
- OUR MOST ADVANCED & HIGHEST DOSED PRE-WORKOUT
- 200 mg▲ NATURAL CAFFEINE
- 6 g▲ L-CITRULLINE
- 3.2 g▲ BETA-ALANINE
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Out of stock
The world’s best selling whey protein. It delivers 24 g of whey protein to support muscle growth.FREE - Optimum Nutrition Shaker + Optimum Nutrition Creatine 187g
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- The World’s bestselling whey protein powder.
- 24 grams of premium whey protein to support muscle growth
- Low in sugars and fat and less than 120 calories
- 5.5 grams of naturally occurring BCAA in each serving
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Out of stock
- The World’s bestselling whey protein powder.
- 24 grams of premium whey protein to support muscle growth
- Low in sugars and fat and less than 120 calories
- 5.5 grams of naturally occurring BCAA in each serving
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The world’s best selling whey protein. It delivers 24 g of whey protein to support muscle growth. -
Sale!
Opti-Women delivers vitamins and minerals to provide the body with a vital nutrient boost to help you cope with the demands of a fast-paced lifestyle.- Reduces Fatigue1
- Supports Metabolic & Immune Function2
- Contains 30 active ingredients
- From your trusted Partner, Optimum Nutrition
- Nutrient Optimising System
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- Amino Blend
- Magnesium, Zinc, Calcium
- Vitamin D and C
- 38 active ingredients
- Supports Metabolic and Immune Function
- Reduces Fatigue
- Zinc and Vitamin B5 to help support cognitive function and mental performance
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- IMMUNITY■ & ELECTROLYTE○ SUPPORT
- 3 g^ CREATINE
- 500 mg^ AQUAMIN®
- 3 mg^ ZINC
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- OUR MOST ADVANCED & HIGHEST DOSED PRE-WORKOUT
- 200 mg▲ NATURAL CAFFEINE
- 6 g▲ L-CITRULLINE
- 3.2 g▲ BETA-ALANINE
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- Intense Caffeine-Free Pre-Workout Formula
- 3.2 g^ BETA-ALANINE
- 2 g^ L-ARGININE
- 8 g^ L-CITRULLINE
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Optimum Nutrition brings you the first Gold Standard Pre-Workout Shot. The product intensifies focus with 175mg Caffeine from natural sources and 1.5 g Beta Alanine. Box of 12 x 60ml shots -
- For muscle growth & maintenance*
- 20g^ High Protein
- A delicious, warm chocolate drink
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Make mixing your drinks easier with the Optimum Nutrition protein shaker. Just add water to your favourite Optimum Nutirition protein powder and enjoy, lump free! 600ml capacity
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Sale!
- Adding Calories Has Never Been This Easy or Tasted So Good
- 1,250 Calories
- 50g Protein
- Over 250g Carbohydrates with NO ADDED SUGAR
- Creatine, Glutamine and Glutamic Acid
- 25 Vitamins and Essential Minerals
-
Sale!
- Adding Calories Has Never Been This Easy or Tasted So Good
- 1,250 Calories
- 50g Protein
- Over 250g Carbohydrates with NO ADDED SUGAR
- Creatine, Glutamine and Glutamic Acid
- 25 Vitamins and Essential Minerals
Chocolate Peanut Butter - Best before end of January 2026
Vanilla - Best before end of December 2025
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Sale!
- Food grade stainless steel
- Carry loop handle
- BPA and DEHP FREE