You should take vitamin rich food. Like Green leafy vegetables, fresh fruits, Dry fruits, Dairy product, egg, fish and meat (if you are vegetarian take soyabeans, paneer instead). You can take vitamin supplements as well but as you are young i would suggest you to go for healthy diet and also get enough sun exposure. Thank you Dr Sourav Agarwala, MD

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You need healthy diet and some medicine to boost immunity You can consult me on practo for prescription and talk