Which of the following minerals is involved in the regulation of blood pressure and has a synergistic relationship with potassium?

A Magnesium ✓
B Calcium
C Phosphorus
D Chromium

Explanation

Magnesium helps to regulate blood pressure by counteracting the effects of sodium and promoting the relaxation of blood vessels. It also works synergistically with potassium to maintain healthy blood pressure levels.

Source

American Heart Association (AHA) - Scientific Statements
Minerals and Trace Elements Cardiovascular Health Mineral Interactions Hard MEDICAL Confidence: high