Protein powder for weight loss: what the “diet” label costs you
Diet, lean and shred powders are mostly ordinary protein plus extras. Here is what those extras cost per kg of protein. Prices updated 7 Nov 2026
Australia: Bulk Nutrients Lean Earth Protein at Bulk Nutrients: A$59 per kg of protein (A$44.00 for 1 kg, 75% protein).
United Kingdom: Applied Nutrition Ltd Diet Whey Protein at Applied Nutrition plc: £38 per kg of protein (£54.95 for 1.8 kg, 80% protein).
Powders sold as diet / lean / shred, cheapest per kg of protein
| # | Product | A$ per kg of protein | Price | Protein | Link |
|---|---|---|---|---|---|
| 1 | Bulk NutrientsLean Earth Protein | A$59A$1.77 per 30 g protein | A$44.001 kg | 75%label | View Bulk Nutrients Lean Earth Protein at Bulk Nutrients |
| 2 | Bulk NutrientsThermowhey Weight Loss Protein | A$76A$2.28 per 30 g protein | A$62.001 kg | 82%label | View Bulk Nutrients Thermowhey Weight Loss Protein at Bulk Nutrients |
Prices checked 7 Nov 2026 (daily), cheapest flavour and best-value size in stock, before shipping and discount codes. Protein % is from each label. How we calculate.
No United States products match this list yet. We add merchants every week.
| # | Product | £ per kg of protein | Price | Protein | Link |
|---|---|---|---|---|---|
| 1 | Applied Nutrition LtdDiet Whey Protein | £38£1.14 per 30 g protein | £54.951.8 kg | 80%label | View Applied Nutrition Ltd Diet Whey Protein at Applied Nutrition plc |
| 2 | Bio-Synergy®Lean & Green® | £53£1.58 per 30 g protein | £34.99908 g | 73%label | View Bio-Synergy® Lean & Green® at Bio-Synergy |
Prices checked 7 Nov 2026 (daily), cheapest flavour and best-value size in stock, before shipping and discount codes. Protein % is from each label. How we calculate.
Diet powders vs plain whey
| Country | Diet / lean / shred (median) | Standard whey (median) |
|---|---|---|
| Australia | A$67/kg protein (n=2) | A$108/kg protein (n=12) |
| United States | none tracked yet | — |
| United Kingdom | £45/kg protein (n=2) | £32/kg protein (n=4) |
If you just want more protein for fewer calories, a plain whey isolate is usually the cheapest per gram of protein and has very little fat or sugar.
FAQ
Does protein powder help you lose weight?
Protein powder is a food. Weight change depends on your overall diet and activity. We compare prices and labels only; for a weight-loss plan, talk to a GP or accredited dietitian.
What is in a diet protein?
Usually a whey or plant base plus extras such as green tea extract, L-carnitine, fibre or extra sweetener. Check the label: some extras are not suitable for everyone, for example caffeine during pregnancy.
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General information only, not medical or dietary advice. Check the label for allergens and talk to a doctor or dietitian if you are pregnant, have a medical condition or take medication.