Why buy from us?

Optimum Nutrition

Optimum Nutrtion's product range, renowned for its variety of great tasting flavours and ease of mixing, includes the world's best selling protein combination of Gold Standard 100% Whey and Casein. All the products have been specifically developed to deliver superior technology to ensure that consumers achieve their goals.  Buy your ON sports supplements from Fitness Ireland at the lowest cost available.

Display: List Grid
Show:
Sort By:
SaleO.N - Starter Stack
ON - 100% WHEY GOLD STANDARD [2.27KG]  Each serving of gold standard 100 pe..
 
€104.97 €99.99

ON - 100% Casein [1.8kg]
The Gold Standard for Slow-Digesting Protein, delivering 24 Grams of slowly digesting protein per..
 
€64.99

ON - 100% Casein [908g]
The Gold Standard for Slow-Digesting Protein, delivering 24 Grams of slowly digesting protein per..
 
€39.99

ON - 100% Gold Standard Whey [2.74kg]
Each serving of gold standard 100 percent whey protein contains 24 g of protein, 5.5 g of branch ..
 
€64.99

ON - 100% Whey Gold Standard [2.27kg] + FREE 200 Fish Oils
  Each serving of gold standard 100 percent whey protein contains 24 g of prote..
 
€59.99

ON - 100% Whey Gold Standard [4.45kg]
Each serving of gold standard 100 percent whey protein contains 24 g of protein, 5.5 g of branch ..
 
€109.99

ON - 100% Whey Gold Standard [450g]
Each serving of gold standard 100 percent whey protein contains 24 g of protein, 5.5 g of branch ..
 
€19.99

ON - 100% Whey Gold Standard [908g]
Each serving of gold standard 100 percent whey protein contains 24 g of protein, 5.5 g of branch ..
 
€31.99

ON - Amino Energy RTD [1x330ml]
100mg caffeine  5g amino acids  Zero sugarOptimum Nutrition Amino Energy RTD ..
 
€2.00

ON - Amino Energy RTDS [24x330ml]
Ready to drink 100mg caffeine  5g amino acids  Zero sugarOptimum Nutrition ..
 
€41.99

ON - Creatine 2500 [200 Caps]
Increases performance during high intensity training 2.5 g of pure creatine monohydrate  &..
 
€29.99

ON - Creatine Powder [300g] + FREE T-Shirt
Each serving supplies a full 5 grams [5000 mg) of 99.9% pure Micronised Creatine Monohydrate. The pr..
 
€19.99

ON - Creatine Powder [600g]
Increases performance during high intensity training 2.5 g of pure creatine monohydrate  &..
 
€29.99

ON - Creatine [144g]
Each serving supplies a full 3.6 grams of 99.9% pure Micronised Creatine Monohydrate. The production..
 
€12.99

ON - Enteric Coated Fish Oil [100 Softgels]
HEART-HEALTHY Omega-3 Fatty Acids.              L..
 
€14.99

ON - Enteric Coated Fish Oil [200 Softgels]
HEART-HEALTHY Omega-3 Fatty Acids              ..
 
€24.99

ON - Essential Amino Energy [270g]
1 serving provides 100 mg of caffeine from natural sources (from Green Tea and/or Coffee Bean) to..
 
€24.99

ON - Glutamine Powder [1000g]
Accelerate post-workout regeneration Inhibiting muscle catabolism An increase in muscle stren..
 
€54.98

ON - Glutamine Powder [600g]
Accelerate post-workout regenerationInhibiting muscle catabolismAn increase in muscle streng..
 
€34.99

ON - Glycomaize Unflavoured [2kg]
ON's glyco-maize is made up of waxy maize starch and trehalose Designed to be used often a..
 
€24.98

ON - Gold Standard 100% Plant Protein [684g]
THE TRUE STRENGTH OF PLANTGold Standard 100% Plant protein was made for active adults who c..
 
€29.99

ON - Gold Standard BCAA [266g]
Introducing The Gold Standard BCAA For Intra Workout Support!5g of high quality BCAAs to help ki..
 
€26.99

ON - Gold Standard Gainer [1.62kg]
55 Grams of Protein - Primarily From Isolate Sources 760 Calories from Quality Ingredients 2:..
 
€39.99

ON - Gold Standard Gainer [3.25kg]
55 g of High quality protein primarily from WPI 763 Calories form quality ingredients With ..
 
€69.99

SaleON - Gold Standard Pre [330g] FLASH SALE + Free Water Bottle
175 mg of Caffeine from Natural Sources 1.5 g of Carnosyn® Beta-Alanine 3 g of Creapure&r..
 
€29.99 €24.99

ON - Gold Standard Zone Gym Bag
A smart and stylish bag, perfect for hitting the gym or overnight stays.Comes with 2 side p..
 
€19.99

ON - Gold Standard Zone Water Bottle 1.8l
BPA free FDA approved and NSF 51 certified Recyclable Perfect for gyms, hiking, and is even..
 
€9.99

ON - Ice Core Water Bottle
Optimum Nutrition Ice Core Water BottleThe Amino Energy Ice Core Compartment Water Bottle from O..
 
€4.99

ON - Instantized BCAA 5000 Powder [324g]
First ever instantized formula to mix easier and stay in solution longer 2:1:1 ratio of Leucine..
 
€34.99

ON - Mini Smart Shaker [600ml]
Anti-Leak Technology Microwave, freezer, & dishwasher safe Industrial high quality plasti..
 
€9.99