A vitamin D level of 4 ng/mL indicates a severe deficiency, but please don't worry, this is very common and easily treatable. To safely raise your levels, a doctor will typically prescribe high-dose Vitamin D3 (cholecalciferol), often 50,000 IU taken once weekly for 8 to 12 weeks. Following this, you will transition to a daily maintenance dose of 1,000 to 2,000 IU. Always take your vitamin D supplement with a meal containing healthy fats to improve absorption. Please consult your physician for a personalized prescription and to schedule a repeat blood test in about three months to monitor your progress.

It is important to address both the deficiencies and the weight loss. Since standard supplements haven't helped, you may need prescription-strength, high-dose Vitamin D3 (cholecalciferol) and Vitamin B12 (cyanocobalamin). If your body isn't absorbing oral supplements well, Vitamin B12 injections are often highly effective. However, rapid weight loss alongside these deficiencies suggests an underlying issue, such as a gut absorption problem (like celiac disease) or thyroid imbalance. Please consult your healthcare provider to investigate the root cause of your weight loss. They can prescribe the correct therapeutic doses of these vitamins and ensure you recover safely.

Some persons may experience fatigue, body soreness, muscular weakness, joint discomfort, low energy, or bone weakening when their vitamin D level is below normal, at 18 ng/mL. Regular morning sun exposure, a nutritious diet, exercise, and foods fortified with vitamin D can occasionally help with mild deficiencies, but many people also require supplements like Vitamin D3 for greater recuperation. It is best to talk to your doctor about supplementation because the right dosage depends on your age, symptoms, calcium levels, and general health.