A Vitamin Profile is a simple blood test that checks two important vitamins: B12 and D. These vitamins support energy, nerve function, bone health, and immunity. Deficiency is common due to poor diet, crash dieting, reduced dairy intake or consumption of fortified foods, and low sunlight exposure. Low vitamin D can weaken bones, while low B12 can cause fatigue, numbness, and poor concentration. Testing helps detect hidden deficiencies early so your doctor can advise supplements, diet changes, and lifestyle improvements tailored to you.