Magnesium helps your muscles relax, your nerves fire and your body turn food into energy. Most of it sits inside your cells and bones, with only a small amount in the blood, so a normal blood result doesn't always mean your stores are full. Low levels can come with heavy sweating, alcohol, some reflux and fluid tablets, and a diet light on greens, nuts and wholegrains. The lab range is 0.7 to 1.1 mmol/L. Magnesium isn't always part of a routine blood test, but it's included in the Vively Baseline Health Check, part of the $99 a month membership.
Check Magnesium alongside 70+ other markers in Vively's Baseline Health Check.
Every marker in range? Get your $99 back. T&Cs apply.Want to save 25%? Try our 4-Month Reset insteadMagnesium (Mg²⁺) is an essential mineral and electrolyte found throughout the body, notably in bones, muscles, and soft tissues. In blood tests, we usually measure total serum magnesium (in mmol/L) as a practical proxy for your circulating magnesium pool.
Magnesium is crucial for energy production through mitochondrial processes, muscle and nerve communication, circadian and stress regulation, and maintaining metabolic flexibility. Over time, modest shortfalls identified on a magnesium blood test may contribute to less efficient glucose regulation, increased oxidative stress, and reduced resilience during periods of higher demand.
What’s an optimal level?
Keep in mind that serum magnesium is only part of the picture, and your individual optimum may lie somewhere within the top portion of the lab range.
An out-of-range result isn’t a diagnosis. It’s a signal. It invites you to examine diet, hydration, stress, sleep, mineral balance and signs of hidden losses or absorption issues.
This information is provided for general health and wellness purposes only and does not replace medical advice.
Among 5,901 Vively members tested in 2024 to 2026, women aged 40 to 49 had a median magnesium of 0.81 mmol/L (middle half 0.79 to 0.86). Men the same age: 0.84 mmol/L. The lab range is 0.70 to 1.10 mmol/L. A member median is not a target.
The line is the median member at each age. The shaded bands show where most members sit. The dashed red lines are the lab range.
| Group (mmol/L) | Members | Median | Middle 50% | 5th to 95th percentile | Lab range |
|---|---|---|---|---|---|
| Women 18 to 29 | 257 | 0.80 | 0.78 to 0.85 | 0.72 to 0.90 | 0.70 to 1.10 |
| Women 30 to 39 | 974 | 0.81 | 0.79 to 0.85 | 0.73 to 0.91 | 0.70 to 1.10 |
| Women 40 to 49 | 1,119 | 0.81 | 0.79 to 0.86 | 0.73 to 0.91 | 0.70 to 1.10 |
| Women 50 to 59 | 831 | 0.83 | 0.80 to 0.88 | 0.73 to 0.93 | 0.70 to 1.10 |
| Women 60 and over | 481 | 0.83 | 0.80 to 0.88 | 0.76 to 0.93 | 0.70 to 1.10 |
| Men 18 to 29 | 261 | 0.82 | 0.80 to 0.86 | 0.74 to 0.92 | 0.70 to 1.10 |
| Men 30 to 39 | 635 | 0.82 | 0.79 to 0.87 | 0.74 to 0.92 | 0.70 to 1.10 |
| Men 40 to 49 | 681 | 0.84 | 0.80 to 0.89 | 0.75 to 0.94 | 0.70 to 1.10 |
| Men 50 to 59 | 404 | 0.84 | 0.80 to 0.89 | 0.75 to 0.94 | 0.70 to 1.10 |
| Men 60 and over | 258 | 0.83 | 0.80 to 0.88 | 0.74 to 0.93 | 0.70 to 1.10 |
Pick your sex and age, then type your result.
What is a normal magnesium level for my age?
Among 5,901 Vively members (first blood test, January 2024 to October 2026), the median magnesium for women was 0.80 mmol/L at 18 to 29, 0.81 at 30 to 39, 0.81 at 40 to 49, 0.83 at 50 to 59 and 0.83 at 60 and over. For men it was 0.82 mmol/L at 18 to 29, 0.82 at 30 to 39, 0.84 at 40 to 49, 0.84 at 50 to 59 and 0.83 at 60 and over.
The lab range is 0.70 to 1.10 mmol/L. A member median is not a target or a diagnosis. If your result is outside the range on your report, talk to your GP.
How to get it: Included in the Baseline Health Check. A GP from our network signs your request after a short telehealth consult, so you don't need to visit your own GP first. See how a blood test without a referral works.
Related tests: Plasma Zinc, Red Blood Cell Folate, Holotranscobalamin, Copper/Zinc ratio
Learn more: What are the blood sugar benefits of quinoa salad?; Complete guide to supplements for blood sugar management
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