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Whey Protein Isolate

What is whey protein isolate?

All whey protein is a by-product of cheese manufacturing.

There are three types of whey protein: whey protein concentrate (WPC), whey protein isolate (WPI) and whey protein hydrolysate (WPH).

If you're interested in learning more about how whey protein is produced, please refer to the FAQ.

Whey protein isolate (WPI) offers a richer, purer quality of protein when compared to a concentrate. Its protein content is marginally higher, it contains fewer calories, carbohydrates and fats, although we're only talking small numbers. Some people, mostly those in the bodybuilding community, swear by the advantages that whey isolate offers over a concentrate. The truth is both fractions are rapidly digesting proteins, so any added benefits will be negligible. That doesn't discount the fact that isolate remains a very popular selling supplement with dedicated fitness enthusiasts, especially those who are lactose intolerant or following a strict low calorie diet. In the bodybuilding world, WPI is a favourite for those cutting body fat. The lactose content in standalone WPI products is typically around 2.5 - 4%.

Due to its lower carbohydrate (lactose) and fat content, WPI is slightly more bio-available and faster at reaching muscles than a concentrate, making it a best choice post-workout. Taking it any other time of the day, except arguably in a pre-workout shake, in our opinion, is a waste. Unless you're following an ultra strict diet, a better through-the-day protein shake would be a mixed blend or even a whey protein concentrate.

Like WPC, WPI is also offered in both unflavoured and flavoured varieties. Unflavoured whey has an average protein content of around 90%. Flavoured variations reduce that by 4 - 7%. Taste-wise, unflavoured WPI is akin to bland watered down milk. Blended in water, the texture is thinner and whiter than plain WPC. The biggest difference between WPI and WPC is in price; WPI has always been more expensive due to its higher production cost. As this description is being written, comparing prices across several of the bulk suppliers, WPI on average costs 30% more than WPC. When you factor in the added marginal benefits, we would argue that a WPC would be a better "overall" option for the majority of people, but there is also the lactose factor to consider, too. Obviously, if lactose is a problem, WPI is the better option.

Would a WPI supplement suit me?

To answer the question adequately, it would really depend on your budget, how dedicated you are to your fitness, your tolerance to lactose, and the added benefits over a WPC. If you're obsessive about calories and maximising the best in the anabolic window post-workout, then WPI should be something to consider. It does contain lactose, albeit in very small quantities. If that's of concern to you, there are other options, including an option by Bulk Powders of an ultra-pure (97%) completely lactose free variant.

The bottom line

If you can afford it and you like the best of the best, give WPI a go.

If you're still not sure, you can find a supplement that will suit your goals with our protein finder.

Show 10 | 25 | 50 | Set products Show products by: Brand Name > Product Name
Myprotein - Impact Native Whey 95

Impact Native Whey 95

Myprotein

5.51 lbs / 2.5 kg Bag

Product Type:Powder

Available Flavours:Chocolate Smooth, Strawberry Cream, Unflavoured, Vanilla

Brand's Website:www.myprotein.com

    • Premium quality whey protein isolate
    • Sourced directly from milk
    • Increased bio-availability
    • All natural with no sweeteners (unflavoured only)
    • Superior amino acid profile
    • Native protein fractions
    • Higher levels of leucine and cystine
Myprotein - Impact Whey Isolate

Impact Whey Isolate

Myprotein

2.2 lbs / 1 kg Bag

Product Type:Powder

Available Flavours:Apple & Raspberry, Banana, Blackcurrant, Blueberry, Blueberry Cheesecake, Chocolate Banana, Chocolate Orange, Chocolate Peanut Butter, Chocolate Smooth, Cinnamon Danish, Coffee Caramel, Maple & Pecan, Natural Banana, Natural Banoffee, Natural Chocolate, Natural Strawberry, Natural Vanilla, Neopolitan (Vanilla / Chocolate / Berry), Orange & Passionfruit, Orange Cream, Peanut Cookie, Pecan Pie, Pineapple, Raspberry, Rocky Road, Rum and Raisin, Salted Caramel, Stracciatella, Strawberry & Raspberry, Strawberry Cream, Tiramisu, Unflavoured, Vanilla, White Chocolate

Brand's Website:www.myprotein.com

    • Over 90% protein content
    • Ideal for building lean mass
    • All natural with no sweeteners (unflavoured only)
    • Low in carbs & fats
    • Rich in high bioavailable BCAAs
Myprotein - Impact Whey Isolate

Impact Whey Isolate

Myprotein

5.51 lbs / 2.5 kg Bag

Product Type:Powder

Available Flavours:Banana, Blueberry, Blueberry Cheesecake, Chocolate Banana, Chocolate Orange, Chocolate Peanut Butter, Chocolate Smooth, Cinnamon Danish, Coffee Caramel, Maple & Pecan, Natural Banoffee, Neopolitan (Vanilla / Chocolate / Berry), Orange Cream, Peanut Cookie, Pecan Pie, Pineapple, Raspberry, Rocky Road, Rum and Raisin, Salted Caramel, Stracciatella, Strawberry & Raspberry, Strawberry Cream, Tiramisu, Unflavoured, Vanilla, White Chocolate

Brand's Website:www.myprotein.com

    • Over 90% protein content
    • Ideal for building lean mass
    • All natural with no sweeteners (unflavoured only)
    • Low in carbs & fats
    • Rich in high bioavailable BCAAs
Myprotein - Impact Whey Isolate

Impact Whey Isolate

Myprotein

11.02 lbs / 5 kg Bag

Product Type:Powder

Available Flavours:Banana, Blueberry, Blueberry Cheesecake, Chocolate Banana, Chocolate Orange, Chocolate Peanut Butter, Chocolate Smooth, Cinnamon Danish, Coffee Caramel, Maple & Pecan, Natural Banoffee, Neopolitan (Vanilla / Chocolate / Berry), Orange Cream, Peanut Cookie, Pecan Pie, Pineapple, Raspberry, Rocky Road, Rum and Raisin, Salted Caramel, Stracciatella, Strawberry & Raspberry, Strawberry Cream, Tiramisu, Vanilla, White Chocolate

Brand's Website:www.myprotein.com

    • Over 90% protein content
    • Ideal for building lean mass
    • All natural with no sweeteners (unflavoured only)
    • Low in carbs & fats
    • Rich in high bioavailable BCAAs
Myprotein - Impact Whey Isolate (Sample)

Impact Whey Isolate (Sample)

Myprotein

0.06 lbs / 25 g Bag

Product Type:Powder

Available Flavours:Banana, Chocolate Smooth, Strawberry Cream, Vanilla

Brand's Website:www.myprotein.com

    • Over 90% protein content
    • Ideal for building lean mass
    • All natural with no sweeteners (unflavoured only)
    • Low in carbs & fats
    • Rich in high bioavailable BCAAs
Myprotein - Iso:Pro 97

Iso:Pro 97

Myprotein

2.2 lbs / 1 kg Bag

Product Type:Powder

Available Flavours:Banana, Banana Cream, Chocolate, Chocolate Caramel, Chocolate Coconut, Cookies & Cream, Milk Chocolate, Natural Banana, Natural Chocolate, Natural Strawberry, Natural Vanilla, Strawberry, Toffee, Unflavoured, Vanilla

Brand's Website:www.myprotein.com

    • Ultra pure form of whey protein isolate
    • Very minimal fats and zero carbs / lactose
    • All natural - no added sweetener (unflavoured only)
    • A massive 97% of protein
    • 3 grams of leucine per 25 gram serving
    • Perfect intra or post-workout choice
Myprotein - Iso:Pro 97

Iso:Pro 97

Myprotein

5.51 lbs / 2.5 kg Bag

Product Type:Powder

Available Flavours:Banana, Banana Cream, Chocolate, Chocolate Caramel, Chocolate Coconut, Cookies & Cream, Milk Chocolate, Natural Banana, Natural Chocolate, Natural Strawberry, Natural Vanilla, Strawberry, Toffee, Unflavoured, Vanilla

Brand's Website:www.myprotein.com

    • Ultra pure form of whey protein isolate
    • Very minimal fats and zero carbs / lactose
    • All natural - no added sweetener (unflavoured only)
    • A massive 97% of protein
    • 3 grams of leucine per 25 gram serving
    • Perfect intra or post-workout choice
Myprotein - Iso:Pro 97

Iso:Pro 97

Myprotein

8.82 lbs / 4 kg Bag

Product Type:Powder

Available Flavours:Banana, Chocolate, Strawberry, Unflavoured, Vanilla

Brand's Website:www.myprotein.com

    • Ultra pure form of whey protein isolate
    • Very minimal fats and zero carbs / lactose
    • All natural - no added sweetener (unflavoured only)
    • A massive 97% of protein
    • 3 grams of leucine per 25 gram serving
    • Perfect intra or post-workout choice
Optimum Nutrition - Hydro Whey

Hydro Whey

Optimum Nutrition

3.5 lbs / 1.59 kg Tub

Product Type:Powder

Available Flavours:Chocolate Peanut Butter, Cookies & Cream Overdrive, Supercharged Strawberry, Turbo Chocolate, Velocity Vanilla

Brand's Website:www.onacademy.co.uk

    • Ultra fast protein delivery
    • No excess fat, cholesterol, or lactose
    • Purest form of whey protein
    • Instantised for easy mixing
    • Single-source protein composed of hydrolysed whey isolates
    • Digestive enzymes
    • 9 grams of leucine, isoleucine, and valine (BCAAs)
PhD Nutrition - Pharma Pure

Pharma Pure

PhD Nutrition

2 lbs / 908 g Bag

Product Type:Powder

Available Flavours:Chocolate Cookie, Chocolate Orange, Strawberry, Vanilla Creme

Brand's Website:www.phd-supplements.com

    • PHD's whey protein isolate
    • Superior as a pre and post-workout shake
    • 25.5 grams of pure protein per 30 gram serving
    • Low in carbs, lactose and virtually no fat
    • Can be used intra-workout for those gruelling sessions
    • Exceptional amino acid profile
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