Vitamin D deficiency is common in chronic kidney disease (CKD), but its management is more complex than in the general population. Since the kidneys help activate vitamin D, patients with CKD may require specific forms of vitamin D or active vitamin D analogues rather than standard over-the-counter supplements. The appropriate treatment depends on your CKD stage, calcium and phosphate levels, parathyroid hormone (PTH) levels, and overall clinical condition. Therefore, you should not self-medicate. Your nephrologist or treating doctor is the best person to determine whether vitamin D supplementation is needed and to prescribe the correct type and dose safely.