Health Why Vitamin D Supplements Aren’t Working: 3 Common Mistakes by Dr Natalie Singh - Health Editor June 20, 2026 by Dr Natalie Singh - Health Editor June 20, 2026 Why Vitamin D Supplements May Not Boost Your Levels: Common Clinical Pitfalls Patients who find that vitamin D supplements fail to improve their blood serum levels often face issues related … 0 FacebookTwitterPinterestEmail