Protein drinks

What is actually inside a bottled protein drink

A protein drink is a shake that is already mixed for you, usually 250 ml to 500 ml, with roughly 20 g to 30 g of protein per bottle. The protein comes from milk (whey, casein or a blend) or from plants such as pea and soya. You open it and drink it, nothing to measure or shake.

Protein contributes to the growth and maintenance of muscle mass. That claim applies to your total protein over the day, not to one bottle. A drink simply makes that daily total easier to reach on days when meals fall short, and it costs more per gram of protein than a tub of protein powder.

Milky shakes, clear drinks and plant-based bottles

The category splits into three types that feel completely different to drink:

• Milky shakes: thick and dessert-like, mostly whey and milk protein. Filling, and they work well in place of a snack.
• Clear protein drinks: made with whey isolate or hydrolysate (protein filtered until almost no milk sugar or fat is left), so they look and taste like juice. Lighter on the stomach and lower in calories.
• Plant-based drinks: usually pea or soya protein, slightly grainier in texture, made for people who avoid dairy.

Lactose is the practical dividing line. Clear drinks based on isolate contain very little of it, while creamy milk-protein shakes contain more. If a shake has ever left you bloated, that is the first thing to check on the label, and a firmer high-protein bar may suit you better.

How we choose the protein drinks we stock

We look at three things: the protein source, the amount per bottle, and the sugar sitting next to it. We prefer drinks with at least 20 g of protein and low added sugar, because a bottle with 8 g of protein and 20 g of sugar is a milkshake with a claim on the front. For clear drinks we want whey isolate, for dairy-free we want pea or soya at a dose that matches the whey versions, not half of it. We buy directly from the brands, and every label passes our compliance team before it goes live. You can read how we select brands and products.

Who these drinks suit, and where they do not help

They suit people who train and struggle to eat enough afterwards, people who skip breakfast, shift workers, and anyone whose appetite drops when the day gets busy. Older adults who eat small meals often find a bottle easier than another plate of food.

They are less useful if your meals already cover your protein. UK adults on average eat well above the national reference intake, so an extra bottle then adds calories rather than anything else. A drink is also not a meal unless it is a complete formula with carbohydrates, fats, vitamins and minerals. Used sensibly, it is a convenient top-up, and the rest of our sports nutrition range covers what happens around your training.