Hello,
Welcome to ehealthforum and thanks for writing us
First of all let me explain you that supplements can never replace the benefits of natural food items.They are used for boosting immunity mainly but prolonged use can cause harm to the body and metabolic system.
The maximum recommended dose is 1-2 gm depending per day depending on the requirement.
The history provided by you says that you have taken Zincovit tablet which usually does not provide 800 calories as it is just a multivitamin.Please confirm it.
Regarding the calorie intake it varies from person to person and depends on the age,weight,daily routine,work outs etc.But an average Indian woman of your age requires about 2000 calories per day.Kindly switch to a balanced diet comprising,fruits,veggies,pulses,fibre etc.
Hope it helps!