Amla (Indian Gooseberry)
Amla is one of the richest natural sources of vitamin C available on the planet— far higher, gram for gram, than most citrus fruits — and vitamin C is essential for the production and function of white blood cells which are directly linked to your immune system.
How to use it:
Eat 1–2 fresh amla a day, or take a teaspoon of amla juice or amla powder mixed with warm water in the morning. Pickled or dried amla (without excess sugar or salt) also works if fresh isn't available. Amla & black salt shots are a hit when it comes to immune system, they are also easy to make provided you get fresh amla or else it can be made also with amla powder.