Strawberry Whey Protein Isolate Powder

Each 28 g scoop of this strawberry protein powder provides 22.1 g of protein. That scoop carries 98 kcal, 0.5 g of fat and 1 g of carbohydrate, of which 0.8 g is sugar, and the powder is 79 g protein per 100 g. Mix 1 scoop into 250 to 350 ml of water or milk, as the label directs. The powder comes in 500 g and 1 kg pouches.

Sources: Product label; British Nutrition Foundation.

Strawberry whey protein from this range is flavoured with strawberry powder and natural flavouring, and sweetened with stevia (Reb A) and thaumatin. Thaumatin is a sweet-tasting protein from the West African katemfe fruit. There is no sucralose, aspartame or acesulfame K, and no artificial colour or preservative. The full ingredient list is whey protein isolate from milk, natural flavouring, strawberry powder, sunflower lecithin, xanthan gum as a thickener, and the two sweeteners. Most of the gram of carbohydrate in a scoop is the natural sugar of the strawberry.

Sources: Product label.

Whey isolate and whey concentrate are the same milk protein at two levels of filtering. Concentrate is whey dried as it comes, typically 70 to 80 percent protein, with lactose and fat making up the remainder. Isolate is filtered further, here to 79 g of protein per 100 g with the strawberry included, so it holds more protein per gram and very little lactose. Whether one form builds muscle better than the other has not been shown: the sports nutrition position stand that reviewed the evidence found no proven winner among protein types. Isolate costs more per kilo because more milk goes into each scoop. Neither form suits a person allergic to milk.

Sources: Mayo Clinic; peer-reviewed position stand (International Society of Sports Nutrition, 2017); product label.

Whey protein isolate supplies a complete protein, containing all nine essential amino acids. The body uses protein to build and repair muscle, bone, skin and every other tissue. Protein contributes to the growth and maintenance of muscle mass and to the maintenance of normal bones. Resistance exercise and protein each stimulate the building of new muscle protein, and the two work together when protein is eaten before or after training. A review of 49 trials in 1863 healthy adults found that adding protein to a training programme increased strength by about 2.5 kg on a one-repetition lift and lean mass by about 0.3 kg; training itself was a far stronger stimulus than the extra protein.

Sources: Mayo Clinic; peer-reviewed meta-analysis (Morton and colleagues, British Journal of Sports Medicine, 2018).

Whey protein isolate counts towards total protein, for which the UK reference intake is 0.75 g per kilogram of body weight a day. For a 70 kg adult that is about 52 g, and average UK intakes already exceed it, at about 88 g a day for men and 64 g for women. Exercise raises the figure: the International Society of Sports Nutrition puts the range for people who train at 1.4 to 2.0 g per kilogram a day, and the 2018 review of 49 trials found no further gain in lean mass above about 1.6 g per kilogram. Per serving, 20 to 40 g of a high-quality protein produced the greatest muscle-building response in trials, which is why a scoop is sized at 22.1 g.

Sources: British Nutrition Foundation; peer-reviewed position stand (International Society of Sports Nutrition, 2017); peer-reviewed meta-analysis (Morton and colleagues, 2018).

Whey protein can be taken at any time, and total daily protein matters more than the hour it is eaten. Muscle responds to protein taken either before or after resistance exercise, and the muscle-building effect of a training session lasts at least 24 hours. The position stand advises spreading protein across the day in servings of 20 to 40 g every three to four hours, rather than eating most of it at one meal. This strawberry powder mixes into water or milk, and neither is preferred in the published guidance.

Sources: Peer-reviewed position stand (International Society of Sports Nutrition, 2017); Mayo Clinic.

Strawberry whey isolate has had most of the lactose filtered out, and the carbohydrate left in a scoop is mainly fruit sugar. Many people who react to milk find isolate comfortable where concentrate is not. It is made from milk and contains milk protein, so it is not suitable for anyone with a milk allergy, because the proteins that trigger the allergy remain in every form of whey.

Sources: Mayo Clinic; product label.

Whey protein belongs alongside whole foods rather than in place of a meal. A scoop supplies protein and little else, so adding fats and fibre makes a shake closer to a meal. The strawberry powder blends into smoothies with fresh berries, banana or yoghurt, and goes into porridge or overnight oats; heating does not change the protein content.

Sources: British Nutrition Foundation; product label.

Whey protein isolate appears safe in the amounts usually taken, and the commonest complaints are digestive. Bloating, wind or loose stools occur more often with concentrate than isolate because of the lactose. A 2024 review of 21 studies found the evidence on long-term high intake in people who do not exercise is thin, and existing kidney problems are a reason to take advice before adding protein powder. Creatine, carbohydrate and a multivitamin are the usual pairings and raise no known problem. Prescription drugs are where care is needed: whey can reduce the absorption of alendronate and of quinolone and tetracycline antibiotics, which should be taken well apart from any dairy protein. Anyone pregnant or breastfeeding, or on regular prescriptions, should speak to a GP or pharmacist first.

Sources: Mayo Clinic; peer-reviewed review (Cava and colleagues, Healthcare, 2024); peer-reviewed position stand (International Society of Sports Nutrition, 2017).