What is the best weight gain protein powder?

Top pick: Optimum Nutrition Serious Mass is usually the best weight-gain protein powder for most people who specifically want a high-calorie mass gainer, not just a regular whey protein. It combines protein with a large carbohydrate/calorie load, which is what helps with weight gain when your total daily calories are too low.

If you want a cleaner or simpler ingredient profile, Transparent Labs Mass Gainer is a strong premium alternative. If you just need extra protein without a huge calorie bomb, use a whey protein like Optimum Nutrition Gold Standard 100% Whey and add calories separately with milk, oats, nut butter, banana, or olive oil.

Best practical choice:

• For hard gainers: Optimum Nutrition Serious Mass
• For higher-quality ingredient preference: Transparent Labs Mass Gainer
• For lean muscle gain with more calorie control: Optimum Nutrition Gold Standard 100% Whey
• For plant-based weight gain: Naked Mass Vegan Weight Gainer

The real “best” depends on whether you need 300 extra calories or 1,000+ extra calories per day. For most people, start with half a serving of a mass gainer and adjust based on weekly weight change.