Best Optimum Nutrition Protein Bars of 2025

Last updated on 15/10/2025

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Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g

Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g

Optimum Nutrition

18% OffFree Shipping

Why we love it

Supports muscle gain and recovery.
Low in sugar and fat.
Variety of flavors available.

Main Highlights

Optimum Nutrition’s Gold Standard 100% WHEY is the world’s best-selling protein powder* designed to support your fitness journey from day one
FAST-ABSORBING whey protein with whey protein isolate as the main ingredient helps with muscle gain and supports recovery* after every training session
The ON whey protein formula is Informed Choice certified, contains naturally-occurring BCAAs and GLUTAMINE and is LOW IN SUGAR and fat
Available in a VARIETY OF SIZES and FLAVOURS: double rich chocolate, banana cream, vanilla ice cream, unflavored protein powder and more
EASY & CONVENIENT: mix one scoop in 180-240 ml of cold water; best enjoyed in the morning or/and during the 30 minutes just before or immediately after training

9.9

Exceptional

9.9

Exceptional

Optimum Nutrition

Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g

18% OffFree Shipping

Why we love it

Supports muscle gain and recovery.
Low in sugar and fat.
Variety of flavors available.

Main Highlights

Optimum Nutrition’s Gold Standard 100% WHEY is the world’s best-selling protein powder* designed to support your fitness journey from day one
FAST-ABSORBING whey protein with whey protein isolate as the main ingredient helps with muscle gain and supports recovery* after every training session
The ON whey protein formula is Informed Choice certified, contains naturally-occurring BCAAs and GLUTAMINE and is LOW IN SUGAR and fat
Available in a VARIETY OF SIZES and FLAVOURS: double rich chocolate, banana cream, vanilla ice cream, unflavored protein powder and more
EASY & CONVENIENT: mix one scoop in 180-240 ml of cold water; best enjoyed in the morning or/and during the 30 minutes just before or immediately after training

Value for Money

FULFIL Vitamin and Protein Bars (15 x 55 g Bars) — White Chocolate Peanut and Caramel Flavour — 20 g High Protein, 9 Vitamins, Low Sugar

FULFIL Vitamin and Protein Bars (15 x 55 g Bars) — White Chocolate Peanut and Caramel Flavour — 20 g High Protein, 9 Vitamins, Low Sugar

Fulfil

3% OffFree Shipping

Why we love it

Balanced nutrition meets delightful taste.
Enriched with essential vitamins.
Ideal for everyday adventures.

Main Highlights

HIGH PROTEIN and LOW SUGAR BARS: Each 55g bar contains 20g of protein, less than 3 grams of sugar and only 211 calories. Great for a tasty treat or a post workout refuel
9 VITAMINS: Each FULFIL bar contains 30 percent RDA for 9 essential vitamins to support you through everyday life
DELICIOUS and NUTRITIOUS: FULFIL bars are not your average protein bar. A bright twist on a FULFIL favourite White chocolate encases a layer of caramel mixed with crunchy crispies surrounding a rich peanut centre
OUR PACKS CONTAIN 15 BARS: So you never run out of your favourite protein bar
LIFE'S WONDERFUEL: We want FULFIL bars to fuel you on all of your everyday adventures, whether it’s to get you through your work day, hiking up a mountain, a workout, or a sofa snack we’ve got you covered

FULFIL Vitamin and Protein Bars (15 x 55 g Bars) — White Chocolate Peanut and Caramel Flavour — 20 g High Protein, 9 Vitamins, Low Sugar

3% OffFree Shipping

Why we love it

Balanced nutrition meets delightful taste.
Enriched with essential vitamins.
Ideal for everyday adventures.

Main Highlights

HIGH PROTEIN and LOW SUGAR BARS: Each 55g bar contains 20g of protein, less than 3 grams of sugar and only 211 calories. Great for a tasty treat or a post workout refuel
9 VITAMINS: Each FULFIL bar contains 30 percent RDA for 9 essential vitamins to support you through everyday life
DELICIOUS and NUTRITIOUS: FULFIL bars are not your average protein bar. A bright twist on a FULFIL favourite White chocolate encases a layer of caramel mixed with crunchy crispies surrounding a rich peanut centre
OUR PACKS CONTAIN 15 BARS: So you never run out of your favourite protein bar
LIFE'S WONDERFUEL: We want FULFIL bars to fuel you on all of your everyday adventures, whether it’s to get you through your work day, hiking up a mountain, a workout, or a sofa snack we’ve got you covered

Optimum Nutrition Marshmallow Protein Bar, 10 x 65 g

Optimum Nutrition Marshmallow Protein Bar, 10 x 65 g

Optimum Nutrition

23% OffFree Shipping

Why we love it

Unique texture, great taste.
Supports nutritional goals.
Versatile workout snack.

Main Highlights

Experience the unique texture and great taste of Optimum Nutrition's protein bars to help support your nutritional goals
ON protein bars are versatile protein snacks packed with 20 g of protein, helping you daily to stay on top of your fitness goals
Sports nutrition protein bars with no added sugar* are great-tasting snack alternatives designed for active people and professional athletes
Enjoy the crunch of Chocolate Brownie and Marshmallow Crunch bars, or indulge in the Nutty Chocolate Caramel, bursting with peanuts and raisins
Protein snacks suitable for vegetarians, to be enjoyed on the go, as a post-workout and pre-workout snack, for both men and women
*Contain naturally occurring sugars

Optimum Nutrition Marshmallow Protein Bar, 10 x 65 g

23% OffFree Shipping

Why we love it

Unique texture, great taste.
Supports nutritional goals.
Versatile workout snack.

Main Highlights

Experience the unique texture and great taste of Optimum Nutrition's protein bars to help support your nutritional goals
ON protein bars are versatile protein snacks packed with 20 g of protein, helping you daily to stay on top of your fitness goals
Sports nutrition protein bars with no added sugar* are great-tasting snack alternatives designed for active people and professional athletes
Enjoy the crunch of Chocolate Brownie and Marshmallow Crunch bars, or indulge in the Nutty Chocolate Caramel, bursting with peanuts and raisins
Protein snacks suitable for vegetarians, to be enjoyed on the go, as a post-workout and pre-workout snack, for both men and women
*Contain naturally occurring sugars

Optimum Nutrition Chocolate Brownie Crunch Protein Bar, 10 x 65 g

Optimum Nutrition Chocolate Brownie Crunch Protein Bar, 10 x 65 g

Optimum Nutrition

Free Shipping

Why we love it

Supports nutritional and fitness goals.
Deliciously versatile protein snack.
Ideal for active lifestyles.

Main Highlights

Experience the unique texture and great taste of Optimum Nutrition's protein bars to help support your nutritional goals
ON protein bars are versatile protein snacks packed with 20 g of protein, helping you daily to stay on top of your fitness goals
Sports nutrition protein bars with no added sugar* are great-tasting snack alternatives designed for active people and professional athletes
Enjoy the crunch of Chocolate Brownie and Marshmallow Crunch bars, or indulge in the Nutty Chocolate Caramel, bursting with peanuts and raisins
Protein snacks suitable for vegetarians, to be enjoyed on the go, as a post-workout and pre-workout snack, for both men and women
*Contain naturally occurring sugars

Optimum Nutrition Chocolate Brownie Crunch Protein Bar, 10 x 65 g

Free Shipping

Why we love it

Supports nutritional and fitness goals.
Deliciously versatile protein snack.
Ideal for active lifestyles.

Main Highlights

Experience the unique texture and great taste of Optimum Nutrition's protein bars to help support your nutritional goals
ON protein bars are versatile protein snacks packed with 20 g of protein, helping you daily to stay on top of your fitness goals
Sports nutrition protein bars with no added sugar* are great-tasting snack alternatives designed for active people and professional athletes
Enjoy the crunch of Chocolate Brownie and Marshmallow Crunch bars, or indulge in the Nutty Chocolate Caramel, bursting with peanuts and raisins
Protein snacks suitable for vegetarians, to be enjoyed on the go, as a post-workout and pre-workout snack, for both men and women
*Contain naturally occurring sugars

Bounty - Hi Protein Bars | 12 x 52g Pack, High Protein Energy Snack with Milk Chocolate and Coconut, 18g of Protein per bar

Bounty - Hi Protein Bars | 12 x 52g Pack, High Protein Energy Snack with Milk Chocolate and Coconut, 18g of Protein per bar

Bounty

15% OffFree Shipping

Why we love it

High protein, delicious chocolate-coconut combo.
Individually wrapped for convenience.
Low calorie, guilt-free indulgence.

Main Highlights

Are you bored of poor tasting protein bars? Are you ready to turn up the taste with Bounty?
You can now enjoy the delicious combination of milk chocolate and coconut all with 18g protein
Every case contains 12 individually wrapped bars perfect for a post workout snack
Each bar comes in two pieces, just like your favourite Bounty chocolate, smothered in desiccated coconut
Only 207 kcals per bar - Not suitable for vegetarians

Bounty - Hi Protein Bars | 12 x 52g Pack, High Protein Energy Snack with Milk Chocolate and Coconut, 18g of Protein per bar

15% OffFree Shipping

Why we love it

High protein, delicious chocolate-coconut combo.
Individually wrapped for convenience.
Low calorie, guilt-free indulgence.

Main Highlights

Are you bored of poor tasting protein bars? Are you ready to turn up the taste with Bounty?
You can now enjoy the delicious combination of milk chocolate and coconut all with 18g protein
Every case contains 12 individually wrapped bars perfect for a post workout snack
Each bar comes in two pieces, just like your favourite Bounty chocolate, smothered in desiccated coconut
Only 207 kcals per bar - Not suitable for vegetarians

Snickers - Milk Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, Hi Protein Energy Snack, 20g Protein

Snickers - Milk Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, Hi Protein Energy Snack, 20g Protein

Snickers

33% OffFree Shipping

Why we love it

Snickers flavor with more protein.
Less sugar, still satisfyingly delicious.
Ideal post workout snack.

Main Highlights

The epic taste of Snickers with 20g of protein and only 2g sugar? Now that’s satisfying!
Snickers Hi Protein Low Sugar boasts all the caramel, nougat, and peanut flavours you know and love from the iconic Snickers bar, covered in a delicious chocolatey coating.
Only 217 kcals per bar - Not suitable for vegetarians
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

Snickers - Milk Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, Hi Protein Energy Snack, 20g Protein

33% OffFree Shipping

Why we love it

Snickers flavor with more protein.
Less sugar, still satisfyingly delicious.
Ideal post workout snack.

Main Highlights

The epic taste of Snickers with 20g of protein and only 2g sugar? Now that’s satisfying!
Snickers Hi Protein Low Sugar boasts all the caramel, nougat, and peanut flavours you know and love from the iconic Snickers bar, covered in a delicious chocolatey coating.
Only 217 kcals per bar - Not suitable for vegetarians
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

Snickers - White Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per Bar, Hi Protein Energy Snack, 20g Protein

Snickers - White Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per Bar, Hi Protein Energy Snack, 20g Protein

Snickers

15% OffFree Shipping

Why we love it

Epic taste with high protein.
Uncompromised Snickers flavor.
Great for post-workout snacking.

Main Highlights

The epic taste of Snickers White with 20g of protein and only 2g sugar? Now that’s satisfying!
Snickers White Hi Protein Low Sugar boasts all the caramel, nougat, and peanut flavours you know and love from the iconic Snickers bar, covered in a delicious chocolatey coating.
Only 218 kcals per bar - Not suitable for vegetarians
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

Snickers - White Chocolate Low Sugar Protein Bars | 12 x 57g Pack, Only 2g of Sugar per Bar, Hi Protein Energy Snack, 20g Protein

15% OffFree Shipping

Why we love it

Epic taste with high protein.
Uncompromised Snickers flavor.
Great for post-workout snacking.

Main Highlights

The epic taste of Snickers White with 20g of protein and only 2g sugar? Now that’s satisfying!
Snickers White Hi Protein Low Sugar boasts all the caramel, nougat, and peanut flavours you know and love from the iconic Snickers bar, covered in a delicious chocolatey coating.
Only 218 kcals per bar - Not suitable for vegetarians
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

PhD Nutrition Smart Protein Bar Low Calorie, Nutritional Protein Bars/Protein Snacks, High Protein Low Sugar, Chocolate Peanut Butter Flavour, 20g of Protein, 64g Bar (12 Pack)

PhD Nutrition Smart Protein Bar Low Calorie, Nutritional Protein Bars/Protein Snacks, High Protein Low Sugar, Chocolate Peanut Butter Flavour, 20g of Protein, 64g Bar (12 Pack)

PhD

12% OffFree Shipping

Why we love it

Perfect for on-the-go protein.
Guilt-free, tasty snacking option.
Aids in weight loss.

Main Highlights

HIGH-PROTEIN BAR: Delicious protein bars with a high protein content. Each 64g bar contains 21g of protein – nearly 30%. The perfect on-the-go protein snack, ideal for a boost during sports activities
LOW-SUGAR INDULGENCE: Each bar contains 2.0g of sugar, making PhD Nutrition Smart Protein Bars suitable for a low-sugar diet or nutrition plan. Completely free from palm oil
PERFECT TEXTURE: A super-soft protein core coated in delicious caramel and protein crispies creates a crunchy yet tender treat for any occasion. A high-protein bar packed with full flavor despite low sugar content
SUITABLE FOR MACRO-FRIENDLY NUTRITION: These protein bars are ideal for supporting a macro-friendly, high-protein diet as part of a balanced nutrition plan
OPTIMIZED SPORTS NUTRITION: PhD collaborates closely with research institutes and sports scientists to tailor the ingredients of all products to specific training purposes

PhD Nutrition Smart Protein Bar Low Calorie, Nutritional Protein Bars/Protein Snacks, High Protein Low Sugar, Chocolate Peanut Butter Flavour, 20g of Protein, 64g Bar (12 Pack)

12% OffFree Shipping

Why we love it

Perfect for on-the-go protein.
Guilt-free, tasty snacking option.
Aids in weight loss.

Main Highlights

HIGH-PROTEIN BAR: Delicious protein bars with a high protein content. Each 64g bar contains 21g of protein – nearly 30%. The perfect on-the-go protein snack, ideal for a boost during sports activities
LOW-SUGAR INDULGENCE: Each bar contains 2.0g of sugar, making PhD Nutrition Smart Protein Bars suitable for a low-sugar diet or nutrition plan. Completely free from palm oil
PERFECT TEXTURE: A super-soft protein core coated in delicious caramel and protein crispies creates a crunchy yet tender treat for any occasion. A high-protein bar packed with full flavor despite low sugar content
SUITABLE FOR MACRO-FRIENDLY NUTRITION: These protein bars are ideal for supporting a macro-friendly, high-protein diet as part of a balanced nutrition plan
OPTIMIZED SPORTS NUTRITION: PhD collaborates closely with research institutes and sports scientists to tailor the ingredients of all products to specific training purposes

Snickers - HI Protein Bars | Low Sugar Bars, Only 1g of Sugar per bar, Dark Chocolate, 12 x 57g Pack, 20g Protein

Snickers - HI Protein Bars | Low Sugar Bars, Only 1g of Sugar per bar, Dark Chocolate, 12 x 57g Pack, 20g Protein

Snickers

Free Shipping

Why we love it

Iconic taste with protein boost.
Guilt-free indulgence, low sugar.
Perfect snack, 215 calories.

Main Highlights

Protein power: Craving Snickers? Now you can get the iconic taste you love with a protein boost! Our Snickers dark chocolate low sugar Hi-protein bars deliver 20g of protein, with just 1g sugar per bar.
Layers of indulgence: Each bar is packed with crunchy peanuts, chewy caramel and coated in rich dark chocolate.
Fuel your day: With only 215 calories per bar, they're perfect for a protein-powered energy snack between meals, a post-workout pick-me-up, or anytime you need an epic treat boost.
Conveniently sized: One box contains 12 bars, individually wrapped for on-the-go enjoyment. Now that’s satisfying!
Good to know: Not suitable for vegetarians. Product contains milk, soya and peanuts. May contain nuts, egg and gluten.

Snickers - HI Protein Bars | Low Sugar Bars, Only 1g of Sugar per bar, Dark Chocolate, 12 x 57g Pack, 20g Protein

Free Shipping

Why we love it

Iconic taste with protein boost.
Guilt-free indulgence, low sugar.
Perfect snack, 215 calories.

Main Highlights

Protein power: Craving Snickers? Now you can get the iconic taste you love with a protein boost! Our Snickers dark chocolate low sugar Hi-protein bars deliver 20g of protein, with just 1g sugar per bar.
Layers of indulgence: Each bar is packed with crunchy peanuts, chewy caramel and coated in rich dark chocolate.
Fuel your day: With only 215 calories per bar, they're perfect for a protein-powered energy snack between meals, a post-workout pick-me-up, or anytime you need an epic treat boost.
Conveniently sized: One box contains 12 bars, individually wrapped for on-the-go enjoyment. Now that’s satisfying!
Good to know: Not suitable for vegetarians. Product contains milk, soya and peanuts. May contain nuts, egg and gluten.

Mars - Salted Caramel Low Sugar Chocolate Hi Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, High Protein Energy Snack, 18g Protein

Mars - Salted Caramel Low Sugar Chocolate Hi Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, High Protein Energy Snack, 18g Protein

Mars

33% OffFree Shipping

Why we love it

Delicious Mars chocolate flavor.
Low sugar, high protein.
Perfect post workout snack.

Main Highlights

Introducing our new Mars Salted Caramel low sugar protein bar which combines the unmistakable delicious taste of Mars chocolate with a soft layer of salted caramel.
This sweet and salty addition to our low sugar range contains 18g of protein per bar and just 2g sugar.
Only 196 calories per bar - Not suitable for vegetarians.
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

Mars - Salted Caramel Low Sugar Chocolate Hi Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, High Protein Energy Snack, 18g Protein

33% OffFree Shipping

Why we love it

Delicious Mars chocolate flavor.
Low sugar, high protein.
Perfect post workout snack.

Main Highlights

Introducing our new Mars Salted Caramel low sugar protein bar which combines the unmistakable delicious taste of Mars chocolate with a soft layer of salted caramel.
This sweet and salty addition to our low sugar range contains 18g of protein per bar and just 2g sugar.
Only 196 calories per bar - Not suitable for vegetarians.
Perfect to carry you between meals, or as a great post workout snack boost.
One box contains 12 individually wrapped bars.

We scanned 151 products

We reviewed these offers relevant to the Optimum Nutrition Protein Bars within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Optimum Nutrition, Fulfil, Bounty, Snickers, PhD, Mars, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Optimum Nutrition Protein Bars in the market, we considered we took a deep dive into 756 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g. We love many things about this product by Optimum Nutrition. What sets it apart from the competition is Supports muscle gain and recovery, Low in sugar and fat, Variety of flavors available.
The best value product for most shoppers and where user satisfaction is continuously the highest is FULFIL Vitamin and Protein Bars (15 x 55 g Bars) — White Chocolate Peanut and Caramel Flavour — 20 g High Protein, 9 Vitamins, Low Sugar by Fulfil based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Optimum Nutrition Protein Bars and the best cost-to-value ratio is Mars - Salted Caramel Low Sugar Chocolate Hi Protein Bars | 12 x 57g Pack, Only 2g of Sugar per bar, High Protein Energy Snack, 18g Proteinat Mars with a 33% discount.
Our list of the best Optimum Nutrition Protein Bars is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.