Candida infections are associated with a weakened immune system and nutrient deficiencies, which include B-12 and folate, including vitamin C. Candida normally live in your body and do not cause problems unless allowed to overgrow.
Anti-fungal medications are available over the counter, but it is important to receive a diagnosis from your doctor. Treatment typically lasts between three and 14 days depending on the severity of your infection. A daily B-complex supplement may also help. But If you have a clinical B-12 deficiency, you need B-12 injections.