As a well built body builder, I need some more suggestions for gaining weight!
Gaining or Loosing weight has its own health implications on health. Its recommended to not to use, off the shelf medicines to achieve this. Consult a doctor before undergoing any medication. However, making lifestyle/food changes is something you can try. Read more: https://www.healthlibrary.in/5-ways-to-improve-your-weight-gain/