Editor's pick for May 2026
For most people, Optimum Nutrition Gold Standard 100% Whey
24g protein per serving, Informed Choice certified, broad flavour range, and one of the most consistently reliable whey protein blends ever produced. The default whey recommendation for adults building a regular protein habit.
- 24g protein · 120 cal · whey isolate + concentrate blend
- Informed Choice certified — batch-tested for banned substances
- Last reviewed 4 May 2026 · prices verified directly from optimumnutrition.com
Or pick the situation that fits
Less sure where to start? These four cards route to the right guide.
- Goal
Build muscle
"I work out regularly but I'm not sure if my protein powder is actually helping."
Best protein for muscle gain → - Goal
Lose weight
"I want protein to keep me full, but most shakes seem loaded with sugar or calories."
Best protein for weight loss → - Dietary need
Dairy-free or lactose-sensitive
"Whey upsets my stomach. I need something that actually works without the side effects."
Dairy-free options → - Starting out
New to protein
"There are so many types — whey, plant, isolate, concentrate. I have no idea what I need."
Complete protein powder guide →
How we work
The four policies the site is built on.
-
Honest critiques on every product
Every brand review and best-list includes a section on what we don't like — texture problems, formula changes, missing certifications. We flag what doesn't work, not just what does.
-
Prices from brand websites, not Amazon
We source prices directly from brand storefronts on the first Monday of every month and timestamp every check. No Amazon prices, no scraped data.
-
Third-party testing matters
We flag whether each product carries Informed Sport, NSF Certified for Sport, Informed Choice — or none. Certification status is shown on every brand page.
-
No sponsored placements, ever
Brands cannot pay to appear in our guides or improve their position. Affiliate commission does not influence rankings. Disclosed on every page.
Quick answers
Three questions we get most often. Each answer links through to the full guide.
What's the difference between whey isolate and whey concentrate?
Whey isolate is more processed, contains 90%+ protein per serving, and has minimal lactose — making it better for sensitive stomachs. Whey concentrate is less processed, cheaper, and retains more natural compounds but has slightly less protein (70–80%) and more lactose.
Read the full comparison →Is protein powder actually necessary, or can I get enough from food?
Most people can meet protein needs through food alone, but protein powder is a convenient way to hit daily targets when whole-food sources aren't practical — particularly post-workout or for people with higher protein requirements.
Read the protein powder guide →Can protein powder cause bloating or digestive issues?
Yes, if you're lactose-sensitive and using a whey concentrate. Switching to whey isolate (lower lactose) or a plant-based protein typically resolves this. Artificial sweeteners like sorbitol can also cause digestive discomfort in some people.
See lactose-free options →Browse by category
All 50+ guides grouped by what you're looking for.