Gold Standard Isolate

Optimum Nutrition Gold Standard Isolate is a whey isolate that SuppSaver compares across 4 Australian retailers. The best price we're currently tracking is $209.99 at Supplement Mania, which works out to $10.99/100g protein — the true-cost figure we rank every whey protein on. That comes to roughly $2.76 per serve. At 81% protein by weight, the cost per 100g of actual protein — not just powder — is what decides whether it's good value.

Retailer prices shift week to week, so we re-check every listing nightly and rank by true cost per 100g of protein rather than sticker price. That lets you see whether Gold Standard Isolate is genuinely the cheapest whey protein on the market or simply discounted right now. It's listed in 2.4kg, 2.3kg, 1.4kg, 1.3kg, 740g and 720g. Shoppers rate it 4.6 out of 5 from 64 reviews. Use the price history, the per-store breakdown and the alternatives below to confirm you're getting the best deal before you buy.