Thanks for your query.
Nice to know that you're are doing work-outs at Gym.
The Problem with the mass-gaining powder is that no one would know what exactly are the contents as many have seen side effects either during use or after stopping it.
Hence, it is a bit risky to use such powders.
And there are better alternatives.
You can use the homemade proteins which are made of daily kitchen items like:
Sprouted pulses, peanuts with jaggery, dals. If you can take non-veg then the boiled eggs, meat fish all are best natural sources of proteins.
So the best way is to go for natural foods and food products.
I hope this answer helps
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