Key takeaways
- Optimum Nutrition Gold Standard 100% Whey is the best overall whey pick, with 24g of protein per serving.
- Dymatize ISO100 Hydrolyzed is the best whey isolate pick, made from hydrolysed whey protein isolate.
- Big-bag whey is the best value pick: bigger bags work out better per serving, so check protein per 100g on the label.
- Most active people building muscle do well on 1.4 to 2.0g of protein per kg of body weight per day (strong evidence).
- Protein powder is a convenient food, not a must: the same protein from meals works just as well (strong evidence).
Christmas shortlist · checked by a qualified personal trainer
The best protein powders in the UK, compared
Picked by a qualified sports nutritionist. Every button opens Amazon, so you can check today's price, size and flavours.
| Pick | Best for | Key facts | Shop |
|---|---|---|---|
 Best overall wheyOptimum Nutrition Gold Standard 100% Whey | Anyone who wants one reliable whey that mixes well and tastes good |
| See price |
 Best whey isolateDymatize ISO100 Hydrolyzed | Cutting phases and people who want more protein for fewer calories |
| See price |
 Best valueBig-bag whey (best value) | Daily shakes on a budget |
| Shop range |
- 01
Image: Optimum Nutrition
Best overall whey
Optimum Nutrition Gold Standard 100% Whey
Perfect for: Anyone who wants one reliable whey that mixes well and tastes good
- 24g of protein per serving
- A blend of whey protein isolate, concentrate and peptides
- Sold in 899g and 2.26kg tubs on Amazon UK
Bez's take · The safe default. Clean macros, easy to mix in water or milk, and a flavour range big enough that you won't get bored.
See today's price on Amazon - 02
Best whey isolate
Dymatize ISO100 Hydrolyzed
Perfect for: Cutting phases and people who want more protein for fewer calories
- Hydrolysed whey protein isolate
- A 2.26kg tub on Amazon UK (Gourmet Vanilla)
Bez's take · Isolate is a little leaner than a blend. Worth it when you are dieting hard and every calorie counts.
See today's price on Amazon - 03
Best value
Big-bag whey (best value)
Perfect for: Daily shakes on a budget
- Look for 20g or more protein per serving
- Check the protein per 100g on the label
- Bigger bags cost less per serving
Bez's take · Protein is protein. If the label shows 20g or more per scoop and you like the taste, a big bag does the job.
Shop the range on Amazon
The short answer
The best protein powder for most UK gym-goers is whey protein. Whey is a complete protein that is rich in leucine and digests quickly (strong evidence).
Most active people building muscle do well on 1.4 to 2.0g of protein per kg of body weight per day, spread over the day (strong evidence). Powder is a convenient food, not a must. Protein from meals works just as well (strong evidence).
Which pick is for you?
- Optimum Nutrition Gold Standard 100% Whey: best overall whey. Pick it for an all-round tub with 24g of protein per serving.
- Dymatize ISO100 Hydrolyzed: best whey isolate. Pick it if you want a hydrolysed whey protein isolate.
- Big-bag whey: best value. Pick it to save on cost per serving. Look for 20g or more protein per serving.
Milk allergy? Skip whey. Lactose intolerant? Try a whey isolate or a plant protein.
Compare the three picks above and hit the buttons to get yours.
How to choose a protein powder
Want to shop like a pro? Use Bez's checklist. He is a qualified personal trainer and sports nutritionist, and these are the criteria he checks first.
| What to check | What good looks like | Why it matters |
|---|---|---|
| Protein per serving | 20g or more per serving | More protein in every scoop helps you hit your daily target. |
| Protein per 100g | Check the label and compare tubs on this number | It shows the real protein content, so you can compare brands fairly. |
| Type | Whey concentrate blend, whey isolate or plant | Each type suits different goals and needs. Pick the one that fits you. |
| Mixing and taste | Mixes smoothly and tastes good to you | You will only keep using a powder you enjoy. |
| Flavour range | A choice of flavours you like | Variety keeps you on track when you get bored. |
| Tub size and cost per serving | Bigger bags cost less per serving | Check the value, not just the tub. |
| Ingredients list | Short and clean | Fewer ingredients means less to worry about. |
| Batch testing for sport | A third-party testing logo if you compete | It gives extra confidence if you face drug testing in competition. |
Ready to pick? Best overall is Optimum Nutrition Gold Standard 100% Whey, with 24g of protein per serving. Want a whey isolate? Try Dymatize ISO100 Hydrolyzed. Want the best value? Look for big-bag whey with 20g or more per serving. Whey is a complete protein, rich in leucine, and it digests quickly (strong evidence). Protein powder is convenient, not a must. The same protein from meals works just as well (strong evidence). Allergic to milk? Skip whey. Have kidney disease? Speak to your GP or a dietitian first. Work out your daily target with the protein calculator.
How much protein you need, and who should take care
Want to build muscle? Protein is your best mate. Most active people building muscle do well on 1.4 to 2.0g of protein per kg of body weight per day, spread over the day (strong evidence). Use a protein calculator to find your number.
Aim for 20 to 40g of protein per meal (moderate evidence). Spread it across the day.
Good news: protein powder is handy, not a must. The same protein from meals works just as well (strong evidence). Powder simply makes hitting your number easier when life gets busy.
Whey is a complete protein. It is rich in leucine and digests quickly (strong evidence).
Bez's picks:
- Optimum Nutrition Gold Standard 100% Whey: best overall whey. It gives you 24g of protein per serving. It blends whey protein isolate, concentrate and peptides.
- Dymatize ISO100 Hydrolyzed: best whey isolate. It uses hydrolysed whey protein isolate.
- Big-bag whey: best value. Look for 20g or more protein per serving. Check the protein per 100g on the label. Bigger bags cost less per serving.
Bez picks by a trainer's criteria: protein per serving, ingredients, taste and cost per serving.
Milk allergy: whey comes from milk, so avoid it.
Lactose intolerance: you may do better with a whey isolate or a plant protein.
Kidney disease: speak to your GP or a dietitian before raising your protein.
General information, not medical advice.
Sources & further reading
- International Society of Sports Nutrition position stand: protein and exercise · Journal of the International Society of Sports Nutrition
- Protein · British Nutrition Foundation
- The Eatwell Guide · NHS
Citations are provided for transparency. This is general information, not medical advice — always consult a qualified professional about your own circumstances.