Have a look at few important Ayurvedic Herbs for weight gain by Dr Ayurveda Official:
* Ashwagandha: This is the most powerful herb when it comes to weight gain.
* Saatavari: It is also very helpful in order to increase your weight.
* Alfalfa: This natural flowering plant consumption makes your body healthy and strong.
* Mulethi: Low immunity is a responsible factor behind weight loss. So you can start taking this herb as well.
* Triphala: It is also a very important herb.