Guide
Can you drink coffee with magnesium glycinate?
Coffee and magnesium glycinate don't interact in a way that stops the supplement working. Caffeine has been shown to increase how much magnesium the kidneys excrete for a few hours after intake, which is a different question from absorption.
Yes, you can drink coffee with magnesium glycinate. There's no research showing caffeine or coffee blocks magnesium glycinate from being absorbed. The one relevant study found something narrower: caffeine temporarily increases how much magnesium the kidneys excrete in urine, which is a separate question from whether the supplement gets absorbed in the first place.
What the research actually measured
A controlled ward study gave 17 healthy adults two caffeine doses — about 3 mg per kilogram of lean body mass each, roughly the caffeine in several cups of coffee for an average adult — while they ate a fixed diet. For six hours after the second dose, urinary excretion of both magnesium and calcium rose significantly. Overnight, the kidneys partly compensated by excreting less of both minerals than on a no-caffeine day, but not enough to fully cancel out the earlier increase.
That's an excretion study, not an absorption study. It tells you caffeine changes how much magnesium leaves the body in urine over the following hours — it says nothing about whether magnesium glycinate taken with or near coffee is absorbed any differently in the gut. No study has tested coffee and a magnesium glycinate supplement together directly.
What this means in practice
| Question | What the evidence shows |
|---|---|
| Does coffee block magnesium absorption? | No study has tested this directly. Nothing documents an absorption block. |
| Does caffeine increase magnesium excretion? | Yes, temporarily — shown at a caffeine dose of roughly two to three cups' worth, taken as two separate doses in one morning. |
| Does normal, moderate coffee drinking meaningfully deplete magnesium status? | Not established. The excretion study used a controlled, above-typical caffeine dose and measured hours, not long-term status. |
If you drink coffee daily and take magnesium glycinate, there's no documented reason to separate the two or time them apart. The excretion effect above is about caffeine generally, not about drinking coffee near a magnesium capsule specifically.
Our product
Electric Tiger Magnesium Glycinate provides 275 mg of elemental magnesium per three-capsule serving, from 2,500 mg of magnesium glycinate, as low as $16.31 a bottle on subscription. The label directs three capsules once daily; it doesn't specify a time relative to coffee or any other beverage.
Questions people ask
Can I drink coffee with magnesium glycinate?
Yes. No research shows coffee interferes with magnesium glycinate absorption. Caffeine has been shown to temporarily increase how much magnesium the kidneys excrete, which is a different mechanism from blocking absorption.
Does caffeine cancel out magnesium?
No study supports that framing. The documented effect is a temporary rise in urinary magnesium loss after a caffeine dose, with partial overnight compensation — not a cancellation of a supplement's effect.
Should I take magnesium glycinate before or after coffee?
No study has tested timing magnesium glycinate around coffee specifically, so there's no evidence-based recommendation to give. Follow the label's daily serving directions.
Does coffee reduce magnesium levels in the body?
The evidence for that is limited to a short-term excretion study using a caffeine dose at the higher end of typical intake, measured over hours, not a long-term magnesium status study from ordinary coffee habits.
Related reading
- How much magnesium glycinate should you take a day?
- Best time to take magnesium glycinate
- Magnesium glycinate and medications: what to check
- Magnesium glycinate and energy
Sources
- Kynast-Gales SA, Massey LK. "Effect of caffeine on circadian excretion of urinary calcium and magnesium." J Am Coll Nutr 1994;13(5):467-72. PMID 7836625.
- Electric Tiger Magnesium Glycinate Supplement Facts: product page.
Sources
- Effect of caffeine on circadian excretion of urinary calcium and magnesium In a controlled ward study, two caffeine doses totaling roughly what's in several cups of coffee raised urinary magnesium loss for six hours, with the body only partly making up for it overnight.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
