Protein supplementation for weight gain
Pro Research Analysisby 
Searched over 200M research papers
Protein Supplementation and Weight Gain: Effects on Muscle Mass and Strength
Protein Supplementation and Resistance Training for Muscle Gain
Protein supplementation, when combined with resistance exercise training, consistently leads to greater increases in muscle mass (fat-free mass) and strength compared to resistance training alone in healthy adults of all ages 123. The improvements are moderate but significant, with studies showing increases in muscle size, strength, and lean body mass during prolonged resistance training periods 12. The effect is more pronounced in individuals who are resistance-trained and in older adults, though the benefit decreases with age 123.
Optimal Protein Intake for Muscle Growth
Research indicates that consuming protein beyond a total daily intake of about 1.6 grams per kilogram of body weight does not provide additional gains in muscle mass during resistance training . This suggests there is a threshold for protein intake, and consuming more than this amount is unlikely to further enhance muscle growth.
Multi-Ingredient Protein Supplements
Supplements that combine protein with other ingredients, such as creatine or vitamin D, can further increase gains in muscle mass and strength, especially in untrained and older individuals 37. However, when directly compared to protein-only supplements, multi-ingredient products do not show a clear advantage .
Protein Supplementation in Older Adults
Older adults benefit from protein supplementation during resistance training, with studies showing increases in lean body mass and strength 2567+1 MORE. Milk-based protein appears to be more effective than whey protein for enhancing muscle gains in this group . The dose, frequency, and timing of protein supplementation do not significantly change the effect, as long as overall intake is adequate . However, the benefits are most noticeable in those who do not already consume enough protein in their regular diet .
Protein Supplementation and Endurance Training
Protein supplementation also supports lean mass gains during endurance training, though the effect is smaller than with resistance training . It can improve aerobic capacity and performance, but the primary benefit for weight gain is still seen with resistance exercise .
Protein Supplementation in Young Adults
In young, healthy adults, protein supplementation during resistance training may only slightly enhance gains in lean body mass, with minimal or no additional effect on strength compared to training alone . This suggests that for young people already consuming enough protein, supplementation may not be necessary for significant muscle or weight gain .
Common Misconceptions and Practical Considerations
Protein supplementation is safe for most people and does not cause harmful effects on kidneys or bones in healthy individuals . It is not necessary to consume protein supplements if dietary intake is sufficient, and there is no need to consume protein immediately after exercise to see benefits . Both animal and plant-based proteins can support muscle growth if total protein intake is adequate .
Conclusion
Protein supplementation is an effective strategy to support weight gain through increases in muscle mass and strength, especially when combined with resistance training. The benefits are most significant in older adults, untrained individuals, and those with inadequate dietary protein intake. Consuming more than 1.6 grams of protein per kilogram of body weight per day does not provide additional muscle gains. For most people, meeting protein needs through diet is sufficient, but supplements can be helpful when dietary intake falls short.
Sources and full results
Most relevant research papers on this topic