it is a general tonic. It may help you but weight gain can't be guaranteed.
However since it is a traditional medicine you can try it.
Also you can do following things.
1. Start taking 3-4 fruits everyday.
2. Drink a glass of lemon water in morning and evening.
3. Eat more ghee/ butter
4. Take 20 almonds everyday.
5. Eat meals/ small snack every 3 hours.
6. Never stay hungry.
7. Eat proteins like a cup of dal, lobia, dried peas, rajma with every meal.
8. Take curds/ paneer regularly.
Try this for a month and you can report back with progress.
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