Magnesium [Mass/Vol]
Magnesium is involved in 300+ enzymatic reactions — think energy production, muscle recovery, mood regulation, sleep quality, and blood sugar control. Serum magnesium is what most labs use, but it's a blunt tool — only ~1% of your total magnesium is in the blood, and levels are tightly regulated. So a “normal” value doesn’t always mean optimal.
If you're tracking recovery, sleep, or metabolic flexibility — or supplementing — it's still useful, especially when paired with RBC magnesium or symptom context.
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$6.56 USD