Politics means the world of government in general:
The vice-president has a long career in politics.
I hate discussing politics with my family because it always turns into an argument.
Sometimes people talk about "office politics" outside the context of government -this means the connections and actions that people inside a company take in order to gain power, forming relationships and manipulating situations to their advantage.
A policy is like a rule. Countries have policies (foreign policy, immigration policy, gun control policy) but schools and companies do, too:
Our policy is that customers can return an item and get a refund within 30 days of their purchase.
My school had strict policies regarding lateness - if you were late more than five times, you got suspended.
For proper nerve and muscle functioning and conversion of blood sugar to energy. Black pepper is a good source of manganese and iron. Manganese helps to ensure healthy bone structure, bone metabolism and helping in building essential enzymes for building bones and also to regulate thyroid functions. While Iron is necessary for the production of Hemoglobin.