Optimum Nutrition Gold Standard vs Applied Nutrition ISO-XP.
Our independent head-to-head review of Optimum Nutrition Gold Standard 100% Whey Protein Powder and Applied Nutrition ISO-XP 1kg, scored on value, protein density, macros and ingredient quality so you don't have to guess which to buy.
WheyWise verdict
Applied Nutrition ISO-XP 1kg wins for most buyers.
90g protein per 100g vs 79g - more protein per scoop
Near-zero carbs and fat for superior macros
Typically cheaper per 100g than Gold Standard
Ingredient quality
Ingredients, line by line.
Every ingredient on each label, classified. Approved means nutritionist-positive sources or actives. Neutral is functional (binders, anti-caking, flavouring). Watch flags additives many buyers want to limit.
ApprovedNeutralWatch
Optimum Nutrition Gold Standard 100% Whey Protein Powder
9 total
Applied Nutrition ISO-XP 1kg
5 total
Optimum ingredients
9 total- Whey protein isolate (milk)
- Whey protein concentrate (milk)
- Hydrolysed whey protein isolate (milk)
- Soy lecithin (emulsifier)
- Curcumin (natural colour)
- Xanthan gum (thickener)
- Flavourings
- SucraloseWatch
- Acesulfame KWatch
Whey blend (98%) is the constant; flavours / colours vary.
View source panel →Applied ingredients
5 total- Whey protein isolate (milk) (≈97%)
- Sunflower lecithin (emulsifier, soy-free)
- Fat-reduced cocoa powder
- Flavouring
- SucraloseWatch
Chocolate variant; soy-free formulation across flavours (sunflower lecithin only).
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