I had alopecia areata for 6 months and it's still spreading out larger. am i lack of any vitamins or minerals? what should i do?

Seek help: If it's truly alopecia areata then there really is limited evidence to suggests that mineral or vitamin supplementation will help this. It's felt to be an autoimmune disease where your body is "attacking" it's own follicles. You need to seek help from a healthcare provider, preferable a dermatologist, for treatment options. These usually involve some form of topical or injection steroids.

Alopecia: Alopecia areata is generally thought to be due to an autoimmune problem where the body is attacking its own hair follicles. There may be a genetic component as well. Regardless, a vitamin deficiency is unlikely to be causing the condition. This should be managed by a doctor as there are many possible options for treatment. However, there is no cure, though many cases resolve on their own.