Partly. Gains plateau once protein needs are met

Muscle growth depends on a training stimulus, enough total protein, enough calories, and recovery. If you eat too little protein, adding powder can help. Once you reach about 1.6 to 2.2 g/kg a day, studies show no meaningful extra gain from more. So more powder does not simply mean more muscle. The relationship is a plateau, not a straight line. Powder is a convenience, not a requirement..

• Muscle growth needs resistance training; protein alone does not build muscle.
• Meta-analyses find benefits for muscle gain plateau at about 1.6 g protein per kg body weight per day (upper estimates about 2.2 g/kg).
• Protein powder is just a convenient food source; whole foods work equally well if total intake is adequate.
• Extra protein beyond needs is burned for energy or stored as fat, not turned into more muscle.
• Very high intakes are generally safe for healthy people, but people with kidney disease should seek medical advice.

The useful question is whether you need more total protein, not more scoops. Powder can help fill a dietary gap, but muscle gains depend on resistance training, and the benefits of increasing protein diminish once you are getting enough.

• Protein supplementation can increase muscle gains during resistance training.
• A large meta-analysis found no further average muscle-building benefit beyond approximately 1.6 grams of total protein per kilogram of body weight per day; this is not an exact cutoff for everyone.
• Protein from food counts toward your daily total; powder is a convenient supplement, not a requirement.

1. ods.od.nih.gov
2. pubmed.ncbi.nlm.nih.gov
3. pmc.ncbi.nlm.nih.gov
4. ods.od.nih.gov
5. doi.org
6. doi.org
7. ods.od.nih.gov
8. bjsm.bmj.com

Muscles do not grow simply from consuming protein; hypertrophy requires mechanical tension from resistance training to signal the body to repair and build tissue. If someone is already meeting their daily protein needs, adding extra protein powder provides no additional muscle gains. Research consistently shows that the muscle-building benefits of protein plateau at approximately 1.6 to 2.2 grams per kilogram of body weight daily for people engaged in strength training. Any surplus amino acids consumed past this point are metabolized for energy or stored as fat. Additionally, protein powder offers no unique advantage over protein obtained from ordinary food sources such as eggs, dairy, meat, tofu, or legumes.

• Resistance exercise is required to stimulate muscle protein synthesis; consuming protein powder without training does not build muscle.
• Comprehensive meta-analyses show that muscle growth benefits plateau at roughly 1.6 to 2.2 grams of total daily protein per kilogram of body weight.
• Protein from whole foods builds muscle just as effectively as protein supplements.
• Excess protein consumed beyond physiological capacity is oxidized for energy or stored as fat rather than converted into muscle tissue.

The claim treats muscle growth as linear in protein intake, which the evidence contradicts. Resistance training plus adequate protein increases muscle, but dose-response studies and meta-analyses show a clear ceiling: past about 1.6 g/kg per day (and certainly past ~2.2 g/kg), extra protein yields no meaningful additional hypertrophy. So 'more protein powder' does not equal 'more muscle' beyond that threshold — it just costs money and calories. Individual needs vary with training status, age and energy intake, and very lean dieters or older adults may benefit from the higher end of the range.

• A meta-analysis of 49 randomised trials (Morton et al., British Journal of Sports Medicine, 2018) found resistance-training muscle and strength gains plateau at about 1.6 g of protein per kg of body weight per day, with the upper confidence bound near 2.2 g/kg.
• Protein powder is a convenience source of protein, not a special muscle-building substance; total daily protein and training stimulus are what matter.
• Protein eaten beyond the body's needs is largely oxidised for energy or stored as fat, not converted into extra muscle tissue.
• Protein supplementation mainly helps people whose normal diet falls short of roughly 1.2–1.6 g/kg per day; most people eating a varied diet already reach that.
• Without progressive resistance training, extra protein produces little or no muscle gain — the training stimulus is the main driver.

Protein powder is a supplement that provides amino acids, which are the building blocks of muscle. However, muscle growth (hypertrophy) is primarily driven by progressive resistance training, not protein intake alone. Research shows that consuming more protein than the body can use for muscle synthesis—typically around 1.6 to 2.2 grams per kilogram of body weight per day—does not result in additional muscle growth. Instead, excess protein is metabolized for energy or stored as fat. Additionally, most people in developed countries consume sufficient protein through their regular diet, making protein powder unnecessary for many. While protein powder can be a convenient way to meet protein needs, especially for athletes or those with higher requirements, it is not a magic solution for muscle growth.

• Muscles grow in response to resistance training, not protein alone.
• The body can only use about 1.6 to 2.2 grams of protein per kilogram of body weight per day for muscle building.
• Excess protein is either burned for energy or stored as fat, not converted into muscle.
• Most people in developed countries already get enough protein from their diet.
• Very high protein intake can strain the kidneys in some individuals.