As my four year old son is allergic to sour and cold things. His immunity is low. I can't give him him citrus fruits like orange, lemon etc. So which vitamin c supplement can I give him for building his immune system? Please reply with dosage also.

Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.