Do red blood cells contain magnesium? The complete guide to RBC magnesium
                                
                                
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                                    5 min read                                
                            
                                Approximately 99% of the body's total magnesium is found inside cells and bones, not in the bloodstream. Therefore, the simple answer to 'Do red blood cells contain magnesium?' is a definitive yes, and this fact is critical for accurately assessing your long-term magnesium status. The concentration of magnesium inside these cells provides a stable, long-term snapshot of your body's reserves.