When I took Grab, I encountered many people whom I think could be Doctors on the sidelines. HAHA
They suggested to me a mixture of the following to up my immune system:
3) Warm Water
Have it every morning and evening.
I stored it in the fridge as such.
Because SG is soooo hot, I opted for the Iced version but warm is supposedly the best.
Well, thanks a million to the caring Grab drivers for their advices. I had bad case of flu and cough so will continuously consume this.
Furthermore lemons are also good for detoxing.