The conversation between human and AI assistant.
Should I use a mass gainer or whey protein to gain weight?
Which one is more effective for muscle gain?
There isn't necessarily a clear answer to that question since it depends on a variety of factors. However, some people might find that mass gainers help them gain weight more quickly due to their higher calorie content, while others might prefer whey protein since it provides a more concentrated source of protein that may be easier to digest.