Health, fitness and the supplement aisle.
Protein · Answer
For most people in South Africa, whey concentrate is the better buy: it builds muscle just as well per gram of protein, while local isolates cost roughly 35% to 50% more per 30 g of protein. Isolate is worth the premium if you are lactose-sensitive or cutting. Isolate is typically 90% protein or more, with under about 1% lactose.
Both are whey. Isolate is filtered further to remove more lactose and fat. Per gram of protein, muscle outcomes are essentially equivalent (ISSN position stand), so the real differences are protein density, lactose, taste and price.
| Whey concentrate (WPC80) | Whey isolate (WPI) | |
|---|---|---|
| Protein (dry basis, typical) | about 70% to 80% | 90% or more |
| Lactose (typical) | about 3% to 8% | under about 1% |
| Texture | creamier | thinner, lighter |
| Muscle effect per gram of protein | same | same |
These figures are industry typicals, not a South African legal standard; check each product's spec sheet.
Local pairs from the same brand (October 2026):
| Brand | Concentrate or blend | Isolate | Extra per 30 g protein |
|---|---|---|---|
| USN | BlueLab 1 kg, R689, about R28 | Isozero 805 g, R899, about R38.50 | about R10 (roughly 37% more) |
| NPL | Platinum Whey 908 g, R700, about R33 | Whey Isolate 700 g, R900, about R48.50 | about R15.50 (roughly 47% more) |
| ATP Fitness | Unflavoured Concentrate 1 kg, R800 per kg | Unflavoured Isolate 800 g, R900, R1 125 per kg | about 41% more per kg of powder |
ATP does not publish protein per serving, so we compare it per kilogram of powder only.
Concentrate suits budget-conscious users who tolerate lactose.
No. Biogen's Iso Whey Premium lists concentrate in its ingredients despite the name, and NPL and Primal isolates still contain sucralose. Read the ingredient list and nutrition table per 100 g: a true isolate sits around 85 to 90 g protein per 100 g, a concentrate around 70 to 80 g.
ATP trade-offs apply to both: no published protein per serving or third-party certification, and a young brand (April 2024). See the best whey protein comparison and best whey isolate.
| Product | Size | Price (source, date) | Servings | R per 30 g protein | R per 100 g powder | Sweeteners |
|---|---|---|---|---|---|---|
| USN BlueLab 100% Whey Protein (1 kg) | 1 kg | R689 (USN shop (za.usn.global), 2026-10) | — | R28.03 | R68.90 | not stated |
| USN Isozero Whey Protein Isolate (805 g) | 805 g | R899-R909.99 (USN shop (za.usn.global), 2026-10) | — | R38.53 | R111.68 | not stated |
| NPL Platinum Whey (908 g) | 908 g | R700 (NPL shop (npl.za.com), 2026-10) | — | R32.89 | R77.09 | sucralose |
| NPL 100% Whey Protein Isolate (700 g) | 700 g | R900 (NPL shop (npl.za.com), 2026-10) | — | R48.46 | R128.57 | sucralose |
| ATP Fitness Unflavoured Whey Protein Concentrate | 1 kg | R800 (ATP Fitness shop, 2026-10) | — | — | R80.00 | None |
| ATP Fitness Unflavoured Whey Protein Isolate | 800 g | R900 (ATP Fitness shop, 2026-10) | — | — | R112.50 | None |
Educational information, not medical advice. Speak to a doctor, pharmacist or registered dietitian before using supplements if you are pregnant or breastfeeding, under 18, taking medication, or living with kidney, liver or heart disease. Prices were observed in October 2026 and are not offers.