Both Vitamin B12 and D3 deficiencies are very common and easily manageable. For Vitamin D3, doctors usually prescribe Cholecalciferol (60,000 IU) once a week for 8 weeks, followed by a monthly maintenance dose. For Vitamin B12, a daily oral supplement of Methylcobalamin (1500 mcg) is standard, though severe deficiencies might require initial injections. You can also boost D3 through safe sunlight exposure and B12 through dairy, eggs, or fortified cereals. Please consult your physician with your exact lab reports so they can prescribe the precise dosages and monitor your progress safely.