← Blood tests
Magnesium, RBC
Advanced wellnessalso red blood cell magnesium
What it isMagnesium measured inside red blood cells, providing a window on intracellular magnesium status that serum can't show.
DoesReports true cellular magnesium availability where most of magnesium's biology happens.
GoodMid-high RBC magnesium signals adequate cellular magnesium stores.
BadLow RBC magnesium reveals deficiency hidden by normal serum magnesium and explains symptoms (cramps, palpitations, insomnia, anxiety) in those whose serum looks fine.
- Standard
- 4.2–6.8 mg/dL.
- Optimal
- 5.5–6.5 mg/dL (higher is good within range)
- Modifiers
- Same drivers as serum magnesium but with a longer time lag.
How to optimize
- Lifestyle
- Same as serum magnesium.
- Diet
- Same as serum magnesium.
- Supplements
- Magnesium glycinate (300–400mg/day), magnesium L-threonate for cognition.
- Peptides
- —
- Drugs
- —
Reference ranges are general adult lab norms; optimal ranges are editorial picks from the longevity literature — not medical advice. Always interpret results with your physician.
within Minerals