A Vitamin D3 level of 12.5 ng/mL indicates a severe deficiency. Typically, doctors prescribe Cholecalciferol (Vitamin D3) 60,000 IU capsules to be taken once weekly for 8 weeks, followed by a monthly maintenance dose. For your Vitamin B12 deficiency, oral Methylcobalamin (1500 mcg daily) is highly effective, though severe cases may require B12 injections initially. Please consult your physician for a personalised prescription and dosage plan, as they will need to monitor your progress and repeat your blood tests in 8 to 12 weeks to ensure your levels are recovering safely.

Your results indicate severe Vitamin D3 deficiency, Vitamin B12 deficiency, and likely iron-deficiency anaemia (suggested by high iron binding). These deficiencies commonly cause fatigue, weakness, bone pain, and tingling sensations. Recommended approach (subject to doctor's approval): Vitamin D3: Weekly high-dose supplements (usually 60,000 IU) for 8 weeks. Vitamin B12: Daily oral tablets or intramuscular injections. Iron: Oral iron supplements (best absorbed when taken with Vitamin C). Specialist to consult: You should consult a General Physician or an Internal Medicine Specialist to get exact dosages prescribed and to monitor your blood levels.