Low-Calorie Protein Powder for Weight Loss

Not every protein powder is ideal for weight loss. Mass gainers are loaded with carbohydrates. Some concentrates have more filler than protein. This page filters out the noise and shows only products that meet a clear standard: at least 70g of protein per 100g of powder and under 400 calories per 100g.

These are the products that give you the most protein for the fewest calories - the metric that actually matters when you are in a calorie deficit. Whey isolate dominates this list for good reason: it is the most protein-dense type of powder with the least fat and carbohydrate.

All products are ranked by protein-to-calorie ratio, with the most efficient options at the top. Prices are checked weekly across UK retailers. Use the filters to narrow by brand, size or specific protein type.