Garam masala is a blend of ground spices common in North Indian and other South Asian cuisines. It is used alone or with other seasonings. The word garam refers to "heat" in Ayurveda. The composition of garam masala differs regionally, with many recipes across India according to regional and personal taste.
It consists of certaining redients like black and white pepper, cinnamon braks etc. Remember that garam masala, if added in greater quantities, or cooked for too long, can over power the dish with its strong flavour.
It does not contain special health benefits. However, The use of beneficial spices like cloves and peppercorns helps improve digestion and immune functions. Some benefits of garam masala is that it slows down the aging process and helps promote weight loss.
Spices used in garam masala recipes vary from region to region. The fact that it is used in many dishes of Mughal origin implies that it could been import of In do-Islamic rulers.