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Top 10 Low‑Calorie Whey Isolates in the UK

Discover low‑calorie whey isolate options with high protein and minimal carbs. Compare macros, sweeteners and value to find your ideal shake.

  • ✅ Updated September 2025
  • 🏆 Best‑Selling
  • 📝 Editorial Reviews & Comparisons
Jamie’s Tip: Choose a whey isolate if you’re watching carbs; clear fruit flavours make a light alternative to milky shakes.
See Rankings ↓
1 Optimum Nutrition Gold Standard Isolate – Strawberry
Optimum Nutrition

Gold Standard 100% Isolate
Isolate | ~25 g protein | ~120 calories | Strawberry flavour | ~28 servings
View Product
2 Dymatize ISO100 – Gourmet Chocolate
Dymatize

ISO100 Hydrolyzed
Hydrolysate | ~25 g protein | ~116 calories | Gourmet Chocolate | ~28 servings
View Product
3 Myprotein Clear Whey – Peach Tea
Myprotein

Clear Whey Protein
Isolate | ~20 g protein | ~90 calories | Peach Tea | ~20 servings
View Product
4 BULK Pure Whey Isolate – unflavoured
BULK

Pure Whey Isolate
Isolate | ~23 g protein | ~110 calories | Unflavoured | ~40 servings
View Product
5 Isopure Whey Isolate – Unflavoured
Isopure

Whey Protein Isolate
Isolate | ~25 g protein | ~106 calories | Unflavoured, zero carb | ~31 servings
View Product
6 BSN Syntha-6 Edge – Chocolate Milkshake
BSN

Syntha‑6 Edge
Blend | ~24 g protein | ~150 calories | Chocolate Milkshake | ~48 servings
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7 Reflex IsoPro – Vanilla
Reflex Nutrition

IsoPro
Isolate | ~22 g protein | ~109 calories | Vanilla | ~80 servings
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8 PhD Diet Whey – Belgian Chocolate
PhD

Diet Whey
Blend | ~17 g protein | ~91 calories | Belgian Chocolate | Low carb | ~50 servings
View Product
9 USN BlueLab 100% Whey – Wheytella
USN

BlueLab 100% Whey
Blend | ~24 g protein | ~127 calories | Wheytella | ~26 servings
View Product
10 Protein Works Clear Diet Whey – Orange & Mango
Protein Works

Clear Diet Whey
Isolate | ~20 g protein | ~85 calories | Orange & Mango | ~20 servings
View Product

Top Low‑Calorie Isolates (Compared Side by Side)

🥇 Optimum Nutrition Gold Standard Isolate 🥈 Dymatize ISO100 Hydrolyzed 🥉 Myprotein Clear Whey Protein
Protein (g)~25~25~20
Calories~120~116~90
TypeIsolateHydrolysateIsolate
SweetenerNatural & ArtificialSucraloseSucralose
Sugar/Carb/Fat levelsLow/Low/LowVery Low/Very Low/Very LowVery Low/Very Low/Very Low
Servings per tub~28~28~20
ExtrasNoneHydrolysed WheyClear Fruit Flavour
Value for moneyBest Value 4.0/53.8/53.7/5
Overall Very Good Good Good
Best forLean MuscleFast DigestionRefreshing Shake
View Product → View Product → View Product →

For general comparison purposes, amounts and servings are approximate and taken from product labels. All “Value for Money” scores are editorial ratings based on the author’s independent assessment. Macro levels (Low/Medium/High) are simplified for ease of comparison. Information is for general purposes only.

FAQs

How does isolate differ from whey concentrate?

Whey isolates undergo extra filtration to remove more lactose, fats and carbohydrates than concentrates. This makes isolates higher in protein per calorie but often at a higher price.

Are low‑calorie isolates lactose free?

Many isolates have reduced lactose levels but may still contain trace amounts. Always check labels or choose products labelled lactose free if you are highly sensitive.

Do I need isolate if I’m cutting calories?

Isolates can be a lean choice for those watching calories and carbs, but some people happily use concentrates depending on their budget and macro needs.

Are hydrolysates better than isolates?

Hydrolysed whey proteins are partially broken down for faster absorption. Whether they’re “better” depends on your goals and budget; many choose isolates for everyday use and hydrolysates for special purposes.

Support your workout recovery with sugar‑free BCAAs.

See Sugar‑Free BCAA →