Disclosure: The Iron Verdict earns commissions from qualifying purchases and partner referrals made through links on this page, at no additional cost to you. We only recommend products and services we would use ourselves. Our editorial standards
24 g of protein per scoop from a whey blend led by isolate, the longest track record in the category and one of the lowest costs per gram of protein. Lactose-sensitive? A pure isolate such as Dymatize ISO100 costs more and carries less lactose.
The Iron Verdict earns a commission through Amazon links, at no extra cost to you. Full policy.
The gap between whey isolate and concentrate is not marketing: isolate is 90%+ protein by weight, concentrate is 70–80%, and the remainder is fat, lactose and whatever the label chooses not to itemise. We compared popular powders on protein per scoop, isolate versus concentrate, third-party testing and price per gram. One came out ahead, and this page shows where it loses as well as where it wins.
💪
The Iron Verdict Team
Certified Personal Trainer
— Updated June 5, 2026— 7 min read
Affiliate Disclosure: The Iron Verdict earns commissions through Amazon affiliate links. Full policy →
Whey protein is the most consumed sports supplement in the world, and for good reason — it's the fastest-digesting, highest-quality protein source available in powder form. But with hundreds of options on the market, choosing the right one is overwhelming.
We compared the most popular whey protein powders on protein per scoop against total scoop weight, isolate versus concentrate, third-party purity testing and price per gram of protein.
Products discussed on this page. Outside the US the links open your local Amazon store where it carries the product; stock and price differ between stores. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
A UK retailer that ships within the UK. Price and stock change often; check them on the retailer's page. We earn a commission if you buy, at no extra cost to you.
Whey stimulates MPS more acutely than casein or soy
Whey protein produced greater acute muscle protein synthesis (MPS) than casein or soy due to faster digestion and higher leucine content. Critical for post-workout timing.
Whey protein + resistance training superior for lean mass gains
In a 10-week RCT, whey protein supplementation combined with resistance training produced significantly greater increases in lean body mass and 1RM strength vs carbohydrate supplement.
Protein supplementation significantly augments muscle hypertrophy
Meta-analysis of 49 RCTs (n=1,863) showed protein supplementation significantly increased gains in fat-free mass during resistance training, with 1.62g/kg/day as the upper threshold.
Whey's high leucine content (~10%) is the primary driver of its superior anabolic response compared to other protein sources, activating mTORC1 at threshold concentrations.
Whey Isolate — 90%+ protein content, low in fat and lactose. Best for lactose-sensitive individuals and those in a calorie deficit. Usually more expensive.
Whey Concentrate — 70-80% protein, retains more natural growth factors and fats. Slightly more calories but often better taste and more affordable.
Whey Blend — Mix of isolate and concentrate. Best overall value — fast-digesting isolate combined with concentrate for a complete amino acid profile. Optimum Nutrition Gold Standard uses this approach.
What to Look For on the Label
Protein per serving: Look for at least 20g per serving
BCAA content: 5g+ is ideal (leucine, isoleucine, valine)
No amino spiking: Avoid products that inflate protein numbers with cheap amino acids like glycine or taurine
Third-party testing: Informed Choice, NSF Sport or Labdoor certification
Minimal fillers: Short ingredient list is usually better
When to Take Whey Protein
The "anabolic window" myth has been largely debunked. Timing matters less than total daily protein intake. That said, consuming whey within 2 hours of training may have a slight edge. The most important thing is hitting your daily protein target consistently.
Frequently Asked Questions
Optimum Nutrition Gold Standard 100% Whey is the one we recommend for most people: 24 g of protein per scoop from a whey blend led by isolate, the longest track record in the category, and one of the lowest costs per gram of protein. If you are lactose-sensitive or counting every calorie, a pure isolate such as Dymatize ISO100 costs more but carries less lactose and fat.
Isolate is better if you're lactose-sensitive or strictly limiting calories, as it has less fat and lactose. Concentrate is fine for most people and offers better value. A blend (like Optimum Nutrition Gold Standard) gives you the best of both.
Research supports 0.7—1g per pound of bodyweight (1.6—2.2g/kg) for regular training. A 180lb person should aim for 126—180g of protein per day from all food sources combined.
Yes. Whey protein is just food — a convenient way to hit your daily protein target. It won't cause weight gain on its own. The extra calories from protein shakes only cause issues if they push you above your total daily calorie target.
Post-workout remains the most supported timing (within 2 hours). But total daily protein is more important than timing — the 'anabolic window' is not as narrow as once believed. Whey at any time of day contributes to protein targets. It's also useful at breakfast to hit protein goals early.
No evidence supports kidney damage from high protein intake in healthy individuals. The concern stems from extrapolation from kidney disease patients (who need protein restriction). Studies in healthy adults show high protein diets (up to 2.8g/kg/day) are safe for renal function.
Whey is superior for acute MPS due to leucine content and digestibility. However, well-formulated plant protein blends (pea + rice) can match whey's anabolic response when leucine is equated (~3g per serving). For vegans, leucine-enriched plant protein is a viable alternative.
The Iron Verdict
Optimum Nutrition Gold Standard 100% Whey
24 g of protein per scoop from a whey blend led by isolate, the longest track record in the category and one of the lowest costs per gram of protein. Lactose-sensitive? A pure isolate such as Dymatize ISO100 costs more and carries less lactose.
The free chart tells you which foods are efficient. This tells you your number — a daily target keyed to your bodyweight rather than a vague goal range — and then the formula for assembling any 30 g meal to hit it. 64 foods, built to keep beside the scale.
