Don’t Take Calcium Supplements If You Have a Heart Condition or Atrial Fibrillation
Summary
Calcium supplements carry significant cardiovascular risks, including a dramatically increased risk of atrial fibrillation and heart attacks. Dr. Berg advises against calcium supplementation for anyone with existing heart conditions, noting that magnesium and potassium deficiencies are more likely the underlying issue in atrial fibrillation cases.
Key Takeaways
- Never take calcium supplements if you have atrial fibrillation — they can worsen the condition
- Calcium supplements are associated with a 3.9x increased risk of developing atrial fibrillation
- 800 mg of calcium supplements can increase the risk of cardiovascular events (heart attacks) by 85%
- Avoid calcium supplementation if you have any cardiovascular issues, not just atrial fibrillation
- Dietary calcium (e.g., from cheese) does not carry the same risks as supplemental calcium
- Atrial fibrillation is more likely linked to a potassium and magnesium deficiency than a calcium deficiency
- If calcium supplements are taken, always pair them with vitamin D3 and vitamin K2 to ensure proper calcium mobilization and prevent harmful deposits
Details
Calcium Supplements and Cardiovascular Risk
Calcium supplements — not dietary calcium — are directly associated with serious cardiovascular risks. Specifically:
- A 3.9x greater risk of developing atrial fibrillation has been linked to calcium supplementation
- Taking 800 mg of supplemental calcium is associated with an 85% increase in cardiovascular events, including heart attacks
This risk does not extend to calcium obtained through whole food sources. For example, calcium from cheese and other dairy foods behaves differently in the body and does not produce the same harmful cardiovascular effects.
Why Calcium Channel Blockers Are Relevant
One commonly prescribed class of blood pressure medications is calcium channel blockers, which work by limiting calcium’s activity in the cardiovascular system. This further illustrates the role excess calcium plays in heart-related conditions.
Atrial Fibrillation: A Mineral Deficiency Problem
Rather than a calcium deficiency, atrial fibrillation is more commonly connected to inadequate levels of:
Addressing these deficiencies may be a more appropriate approach than reaching for calcium supplements.
Safe Use of Calcium: D3 and K2
If calcium supplementation is considered necessary, it should always be taken alongside:
- Vitamin D3 — supports calcium absorption and utilization
- Vitamin K2 — directs calcium to appropriate locations (bones and teeth) and prevents it from depositing in arteries and soft tissues
This combination helps reduce the risk of calcium accumulating in places it shouldn’t, such as arterial walls.