Best Protein Powder for Muscle Gain (2026)

Best Protein Powder for Muscle Gain (2026)

Optimum Nutrition (ON) Gold Standard 100% Whey takes the #1 spot for best protein powder for muscle gain because it delivers 24 g of high-quality whey protein per serving, mixes easily, and has a proven amino acid profile that supports muscle protein synthesis.

How we picked: We ranked these protein powders based on verified third-party testing, protein quality (PDCAAS or equivalent), grams of essential amino acids per serving, mixability, taste variety, and value per gram of protein.

	Pick	Best for	Where to buy
	Editor's pick Optimum Nutrition (ON) Gold Standard 100% WheyPer 100g: 376 kcal · 72.7273g protein · 6.06061g sugar	athletes and lifters who want a trusted, widely available whey protein with consistent mix	Check price
	Dymatize ISO100 Hydrolyzed Whey Protein IsolatePer 100g: 375 kcal · 78.125g protein · 3.125g sugar	those prioritizing fast digestion and minimal fat/calories while chasing lean muscle gains	Check price
	Ghost Whey ProteinPer 100g: 410 kcal · 25g protein · 4g sugar	lifters who value ingredient transparency, third-party certifications, and a wide flavor l	Check price
	Cellucor Cor-Performance Whey	athletes seeking highly soluble whey with added digestive enzymes for comfort and absorpti	Check price
	MuscleTech NitroTech Whey Isolate + Hydrolyzed Whey	lifters who want added ergogenic support (creatine) within their post-workout protein blen	Check price
	Transparent Labs 100% Grass-Fed Whey ProteinPer 100g: 379 kcal · 81.6327g protein · 1g sugar	clean-label seekers who prefer grass-fed sources and no artificial additives.	Check price
	MyProtein Impact Whey IsolatePer 100g: 360 kcal · 83.3333g protein · 1.66667g sugar	budget-focused lifters who still want high-quality whey isolate with third-party testing.	Check price

Product images & nutrition data via Open Food Facts (ODbL / CC BY-SA).

1. Optimum Nutrition (ON) Gold Standard 100% Whey

ON Gold Standard 100% Whey is the gold standard for lean muscle growth thanks to its 24 g of whey protein isolate and concentrate blend and 5.5 g of naturally occurring BCAAs per serving, both shown to stimulate muscle protein synthesis more effectively than lower-quality proteins.

Best for: athletes and lifters who want a trusted, widely available whey protein with consistent mixability and excellent amino acid delivery for muscle gain.

• Proven 24 g protein per serving with whey isolate + concentrate blend
• 5.5 g of naturally occurring BCAAs to support muscle protein synthesis
• 30+ flavors and NSF Certified for Sport for purity

2. Dymatize ISO100 Hydrolyzed Whey Protein Isolate

Dymatize ISO100 is ultra-filtered to 90%+ whey protein isolate and hydrolyzed for rapid absorption, which research indicates can accelerate amino acid availability during post-workout recovery compared with standard whey concentrates.

Best for: those prioritizing fast digestion and minimal fat/calories while chasing lean muscle gains.

• 90%+ hydrolyzed whey protein isolate for rapid absorption
• 25 g protein per serving with <1 g fat and <1 g sugar
• Informed Choice and NSF Certified for Sport tested batches

3. Ghost Whey Protein

Ghost Whey stands out with 25 g of multi-source protein and transparent labeling of all ingredients, aligning with clean-label consumer demand and third-party verification, which supports trust in dosing and purity for muscle-building regimens.

Best for: lifters who value ingredient transparency, third-party certifications, and a wide flavor lineup without proprietary blends.

• 25 g multi-source protein (whey concentrate, isolate, hydrolyzed, milk protein isolate)
• 12 g EAA blend with clinically dosed ingredients
• NSF Certified for Sport and Informed Choice approved

4. Cellucor Cor-Performance Whey

Cor-Performance Whey uses enzyme-treated whey to increase protein solubility and digestibility, which peer-reviewed studies associate with improved post-prandial amino acid availability and reduced gastrointestinal discomfort during high-volume training blocks.

Best for: athletes seeking highly soluble whey with added digestive enzymes for comfort and absorption.

• 25 g protein with enzyme-treated whey for faster digestion
• 5 g glutamine + 5 g BCAAs per serving
• Informed Choice certified and free of banned substances

5. MuscleTech NitroTech Whey Isolate + Hydrolyzed Whey

NitroTech combines whey isolate with hydrolyzed whey and creatine monohydrate, ingredients whose combined effects on strength and muscle hypertrophy are documented in meta-analyses comparing whey-based formulations to placebo.

Best for: lifters who want added ergogenic support (creatine) within their post-workout protein blend.

• 30 g protein with whey isolate + hydrolyzed whey
• 3 g creatine monohydrate per serving
• Informed Choice and NSF Certified for Sport

6. Transparent Labs 100% Grass-Fed Whey Protein

Transparent Labs uses grass-fed whey isolate with no artificial sweeteners, aligning with consumer preferences for clean, minimally processed protein sources while maintaining high leucine content (≈2.5 g per serving) that drives muscle protein synthesis.

Best for: clean-label seekers who prefer grass-fed sources and no artificial additives.

• 28 g grass-fed whey isolate with ≈2.5 g leucine per serving
• No artificial sweeteners, colors, or preservatives
• Informed Choice tested

7. MyProtein Impact Whey Isolate

MyProtein Impact Whey Isolate delivers a concentrated 23 g of whey isolate per serving at a lower price per gram than many competitors, making it a strong budget-conscious pick for consistent muscle-building supplementation without sacrificing quality.

Best for: budget-focused lifters who still want high-quality whey isolate with third-party testing.

• 23 g whey protein isolate per serving
• Low cost per gram of protein
• Informed Sport tested batches