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Rethink Your Vitamin D Intake Now
14 Apr
Summary
- New research suggests many may not need vitamin D supplements.
- Major trials found no benefit for heart attack, stroke, or cancer.
- Excessive intake can lead to dangerous calcium buildup in blood.
Millions of individuals regularly consume vitamin D supplements, yet emerging research suggests this practice may be unnecessary for many and potentially harmful. Recent extensive trials, including one with over 25,000 adults, found no significant decrease in the incidence of heart attacks, strokes, or cancer among supplement users. Further studies in 2025 also indicated no benefits for cognitive function or dementia prevention.
However, the evidence is not entirely negative. The large-scale trial revealed that participants who took vitamin D supplements for at least two years experienced a 25% lower mortality rate from cancer. Additionally, five years of supplementation was associated with a 22% reduced risk of developing autoimmune diseases like rheumatoid arthritis.
Official guidelines now state that healthy adults under 75 generally do not require supplements. Recommended recipients include children, adults aged 75 and older, pregnant women, and individuals with high-risk prediabetes. Concerns also exist regarding safety, as excess vitamin D can lead to hypercalcemia, potentially damaging arteries and increasing the risk of kidney stones. Older adults on high doses have shown an increased risk of falls.
