Brief Answer:
As explained below

Detailed Answer:
Hello,

Thanks for posting your query. I would need more details to help you gain weight. As a general physician i would suggest you to take multivitamins such as
Cap. Becadexamin once a day for 30 days.

We also have dietitians on board but they will require more information to make personalized diet plan for you, like your eating habits and food preferences. You may log into "Active Health App"
using this link: http://onelink.to/activhealth-hcm
and raise a diet request by filling the diet request form. Our dietitians on the panel will answer the same in detail.

You may contact our customer care Team at 080-0000, in case if you need any assistance.

I hope this helps. Please feel free to discuss further if any.
Regards.

---