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| Meta Title | How Drinking Caffeine May Affect Your Magnesium Levels |
| Meta Description | Due to its diuretic nature, caffeine may lower magnesium levels in your body. Low magnesium levels can cause fatigue and muscle cramps. |
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| Boilerpipe Text | Caffeine depletes magnesium levels by increasing fluid loss. This diuretic effect may cause unwanted health issues.
1
Your kidneys regulate the magnesium in your body by keeping what you need (or reabsorbing) and removing what you don't need through your urine.
2
3
Caffeine can disrupt this process in the following ways:
Caffeine is a
natural diuretic
,
meaning
it helps your body eliminate fluids and electrolytes through your urine.
4
Your body loses about 1.17 milliliters of water for every milligram (mg) of caffeine consumed.
5
Diuretics cause your kidneys to
flush out more magnesium
before your body can absorb it.
3
This can lead to
low magnesium levels
.
Caffeine may affect how well your intestines absorb magnesium, potentially lowering magnesium levels.
5
That said, there is conflicting data on whether magnesium loss improves or worsens if you regularly consume caffeine.
Some experts believe your body adjusts to regular caffeine intake over time, so you don't lose as much fluid. Others believe that regularly consuming caffeine increases your risk of fluid and
magnesium absorption
issues.
5
More research is needed to understand this relationship.
Magnesium deficiency
(or hypomagnesemia) affects nearly half of people in the U.S. Possible hypomagnesemia symptoms include:
1
6
Arrhythmia (abnormal heartbeat)
Fatigue
Anxiety
, stress, or mood changes
Loss of appetite
Nausea or vomiting
Muscle cramps or spasms
Seizures
Weakness
Severely low magnesium can also
lower other electrolyte levels
, like calcium and
potassium
.
1
The effects of caffeine may vary based on your individual sensitivity and how quickly it is eliminated from your body.
According to the United States Food and Drug Administration (FDA):
Safe:
Up to 400 milligrams (mg) of caffeine per day
for most adults.
4
Too much
: Around 1,200 mg can cause dangerous effects, like seizures.
7
Common sources of caffeine include:
4
Coffee
(8 oz):
95-200 mg
Energy drink (8 oz):
70-100 mg
Tea (8 oz):
14-60 mg
Soda (12 oz):
35-45 mg
What Is the Recommended Magnesium Intake?
Males (19-30 years)
400 mg
Males (31+ years)
420 mg
Females (19-30 years)
310 mg
Females (31+ years)
320 mg
Pregnant people (19-30 years)
350 mg
Pregnant people (31-50 years)
360 mg
National Institutes of Health: Office of Dietary Supplements. Magnesium. 
In addition to caffeine, the following factors may reduce your magnesium levels:
6
Poor diet or
malnutrition
Fluid loss (such as from heavy sweating or diarrhea)
Medical conditions that affect nutrient absorption
Excessive urination
Alcohol use
Certain medications (e.g., diuretics, laxatives, some chemotherapies)
If you're worried about your magnesium levels, there are several things you can do to
improve magnesium absorption
.
1. Eat Magnesium-Rich Foods
Dietary sources of magnesium
include:
1
Leafy greens (spinach, kale)
Whole grains (brown rice, oats)
Nuts and seeds (pumpkin, chia, almonds)
Legumes (lentils, black beans)
2. Consider Supplements
Magnesium supplements
come in many forms, such as oxide, citrate, and
glycinate
. Talk to a healthcare provider to determine which supplement and dosage is best for you.
1
3. Focus on a Balanced Diet
Other vitamins and minerals may also affect magnesium levels. Eating a nutritious, well-balanced diet can help your body absorb minerals better overall.
To enjoy your morning coffee without compromising magnesium:
Cut back on caffeine or choose decaf. Decaf coffee still contains some caffeine, but not as much as regular coffee.
7
Stay hydrated
to offset caffeine’s
dehydrating
effects.
Eat more
magnesium-rich foods
or talk to a medical provider about supplements. |
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# How Drinking Caffeine May Affect Your Magnesium Levels
By
[Kirstyn Hill, PharmD, MPH](https://www.health.com/kirstyn-hill-8575888)
![Young woman with long hair wearing a black blazer]()
:max_bytes\(150000\):strip_icc\(\)/pharmacy0386-KirstynHill-ddc007c86bd84c5eb06722b500199ba8.JPG)
[Kirstyn Hill, PharmD, MPH](https://www.health.com/kirstyn-hill-8575888)
Kirstyn Hill has worked as a clinical pediatric and women’s health pharmacist since 2020. She was driven to work with a patient population that is not often able to easily speak up for themselves and require unique approaches to medical counseling and understanding of their health conditions. Kirstyn is also a healthcare writer; she is passionate about closing education gaps between healthcare and the community.
[health's editorial guidelines](https://www.health.com/health-com-s-editorial-process-5224046)
Published on March 26, 2026
Medically reviewed by
[Femi Aremu, PharmD](https://www.health.com/femi-aremu-pharmd-6751117)
![Femi Aremu, PharmD]()
:max_bytes\(150000\):strip_icc\(\)/FemiAremu-9f35295b2ff04ceeafd7b99b239659f4.png)
Medically reviewed by [Femi Aremu, PharmD](https://www.health.com/femi-aremu-pharmd-6751117)
Femi Aremu, PharmD, is a Drug Information Pharmacist for Red Ventures and practiced in a COVID-19 clinic for the University of Chicago Medicine.
[learn more](https://www.health.com/health-com-s-medical-expert-board-5224047)
Close
:max_bytes\(150000\):strip_icc\(\)/Health-GettyImages-CaffeineAndMagnesium-rt-9d4809d49cd04f55a2c8a10b6cad87a2.jpg)
:max_bytes\(150000\):strip_icc\(\)/Health-GettyImages-CaffeineAndMagnesium-rt-9d4809d49cd04f55a2c8a10b6cad87a2.jpg)
Caffeine's diuretic nature may lower magnesium levels in your body, which may cause muscle cramps, anxiety, and weakness.
Olena Malik / Getty Images
- Caffeine's diuretic nature may lower magnesium levels in your body.
- Low magnesium levels can cause muscle cramps, anxiety, and weakness.
- Eating more magnesium-rich foods can help balance caffeine's effects.
Caffeine depletes magnesium levels by increasing fluid loss. This diuretic effect may cause unwanted health issues.1
## What’s the Connection Between Caffeine and Magnesium?
Your kidneys regulate the magnesium in your body by keeping what you need (or reabsorbing) and removing what you don't need through your urine.23
Caffeine can disrupt this process in the following ways:
- Caffeine is a [natural diuretic](https://www.health.com/diuretics-8383873)**,** meaningit helps your body eliminate fluids and electrolytes through your urine.4Your body loses about 1.17 milliliters of water for every milligram (mg) of caffeine consumed.5
- Diuretics cause your kidneys toflush out more magnesiumbefore your body can absorb it.3 This can lead to [low magnesium levels](https://www.health.com/magnesium-deficiency-symptoms-7642391).
- Caffeine may affect how well your intestines absorb magnesium, potentially lowering magnesium levels.5
That said, there is conflicting data on whether magnesium loss improves or worsens if you regularly consume caffeine.
Some experts believe your body adjusts to regular caffeine intake over time, so you don't lose as much fluid. Others believe that regularly consuming caffeine increases your risk of fluid and [magnesium absorption](https://www.health.com/how-long-does-magnesium-stay-in-your-body-11714180) issues.5 More research is needed to understand this relationship.
## What Are the Risks of Low Magnesium?
[Magnesium deficiency](https://www.health.com/nutrition/magnesium-deficiency)(or hypomagnesemia) affects nearly half of people in the U.S. Possible hypomagnesemia symptoms include:16
- Arrhythmia (abnormal heartbeat)
- Fatigue
- [Anxiety](https://www.health.com/condition/anxiety/12-signs-you-may-have-an-anxiety-disorder), stress, or mood changes
- Loss of appetite
- Nausea or vomiting
- Muscle cramps or spasms
- Seizures
- Weakness
Severely low magnesium can also [lower other electrolyte levels](https://www.health.com/electrolytes-7255607), like calcium and [potassium](https://www.health.com/hypokalemia-symptoms-7966570).1
## How Much Caffeine Is Safe?
The effects of caffeine may vary based on your individual sensitivity and how quickly it is eliminated from your body.
According to the United States Food and Drug Administration (FDA):
- **Safe:** [Up to 400 milligrams (mg) of caffeine per day](https://www.health.com/how-much-coffee-is-too-much-11784279) for most adults.4
- **Too much**: Around 1,200 mg can cause dangerous effects, like seizures.7
Common sources of caffeine include:4
- [**Coffee**](https://www.health.com/food/health-benefits-of-coffee) **(8 oz):** 95-200 mg
- **Energy drink (8 oz):** 70-100 mg
- **Tea (8 oz):** 14-60 mg
- **Soda (12 oz):** 35-45 mg
| What Is the Recommended Magnesium Intake? | |
|---|---|
| **Males (19-30 years)** | 400 mg |
| **Males (31+ years)** | 420 mg |
| **Females (19-30 years)** | 310 mg |
| **Females (31+ years)** | 320 mg |
| **Pregnant people (19-30 years)** | 350 mg |
| **Pregnant people (31-50 years)** | 360 mg |
National Institutes of Health: Office of Dietary Supplements. Magnesium. 
## What Else Can Lower Magnesium?
In addition to caffeine, the following factors may reduce your magnesium levels:6
- Poor diet or [malnutrition](https://www.health.com/loss-of-appetite-8731849)
- Fluid loss (such as from heavy sweating or diarrhea)
- Medical conditions that affect nutrient absorption
- [Excessive urination](https://www.health.com/condition/urological-conditions/what-is-polyuria)
- Alcohol use
- Certain medications (e.g., diuretics, laxatives, some chemotherapies)
## How Can You Boost Magnesium Naturally?
If you're worried about your magnesium levels, there are several things you can do to [improve magnesium absorption](https://www.health.com/supplements-to-take-with-magnesium-11901903).
### 1\. Eat Magnesium-Rich Foods
[Dietary sources of magnesium](https://www.health.com/foods-high-in-magnesium-11928924) include:1
- Leafy greens (spinach, kale)
- Whole grains (brown rice, oats)
- Nuts and seeds (pumpkin, chia, almonds)
- Legumes (lentils, black beans)
### 2\. Consider Supplements
[Magnesium supplements](https://www.health.com/types-of-magnesium-7853312) come in many forms, such as oxide, citrate, and [glycinate](https://www.health.com/magnesium-glycinate-8415806). Talk to a healthcare provider to determine which supplement and dosage is best for you.1
### 3\. Focus on a Balanced Diet
Other vitamins and minerals may also affect magnesium levels. Eating a nutritious, well-balanced diet can help your body absorb minerals better overall.
## How Can You Balance Caffeine and Magnesium?
To enjoy your morning coffee without compromising magnesium:
- Cut back on caffeine or choose decaf. Decaf coffee still contains some caffeine, but not as much as regular coffee.7
- Stay hydratedto offset caffeine’s [dehydrating](https://www.health.com/dehydration-7376352) effects.
- Eat more [magnesium-rich foods](https://www.health.com/snacks-that-are-high-in-magnesium-11821274) or talk to a medical provider about supplements.
Read more:
- [Wellness](https://www.health.com/wellness)
- [Nutrition](https://www.health.com/nutrition)
- [Vitamins and Supplements](https://www.health.com/nutrition/vitamins-supplements)
Was this page helpful?
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Other
7 Sources
Health.com uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https://www.health.com/health-com-s-editorial-process-5224046) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
1. National Institutes of Health: Office of Dietary Supplements. [Magnesium](https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/).
2. National Institutes of Health: National Cancer Institute: [Absorption](https://www.cancer.gov/publications/dictionaries/cancer-terms/def/absorption).
3. Dutta P, Hakimi S, Layton AT. [How the kidney regulates magnesium: A modelling study](https://royalsocietypublishing.org/doi/10.1098/rsos.231484#:~:text=The%20kidney%20reabsorbs%2095%E2%80%9398,~23%25%29%20%5B7%5D.). R Soc Open Sci. 2024;11231484. doi:10.1098/rsos.231484
4. MedlinePlus. [Caffeine](https://medlineplus.gov/caffeine.html).
5. NatMed. [Caffeine](https://naturalmedicines.therapeuticresearch.com/databases/food,-herbs-supplements/professional.aspx?productid=979). In: *NatMed*. NatMed; 2024.
6. MedlinePlus. [Magnesium deficiency](https://medlineplus.gov/ency/article/000315.htm).
7. U.S. Food and Drug Administration. [Spilling the beans: How much caffeine is too much?](https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much).
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| Readable Markdown | Caffeine depletes magnesium levels by increasing fluid loss. This diuretic effect may cause unwanted health issues.1
Your kidneys regulate the magnesium in your body by keeping what you need (or reabsorbing) and removing what you don't need through your urine.23
Caffeine can disrupt this process in the following ways:
- Caffeine is a [natural diuretic](https://www.health.com/diuretics-8383873)**,** meaningit helps your body eliminate fluids and electrolytes through your urine.4Your body loses about 1.17 milliliters of water for every milligram (mg) of caffeine consumed.5
- Diuretics cause your kidneys toflush out more magnesiumbefore your body can absorb it.3 This can lead to [low magnesium levels](https://www.health.com/magnesium-deficiency-symptoms-7642391).
- Caffeine may affect how well your intestines absorb magnesium, potentially lowering magnesium levels.5
That said, there is conflicting data on whether magnesium loss improves or worsens if you regularly consume caffeine.
Some experts believe your body adjusts to regular caffeine intake over time, so you don't lose as much fluid. Others believe that regularly consuming caffeine increases your risk of fluid and [magnesium absorption](https://www.health.com/how-long-does-magnesium-stay-in-your-body-11714180) issues.5 More research is needed to understand this relationship.
[Magnesium deficiency](https://www.health.com/nutrition/magnesium-deficiency)(or hypomagnesemia) affects nearly half of people in the U.S. Possible hypomagnesemia symptoms include:16
- Arrhythmia (abnormal heartbeat)
- Fatigue
- [Anxiety](https://www.health.com/condition/anxiety/12-signs-you-may-have-an-anxiety-disorder), stress, or mood changes
- Loss of appetite
- Nausea or vomiting
- Muscle cramps or spasms
- Seizures
- Weakness
Severely low magnesium can also [lower other electrolyte levels](https://www.health.com/electrolytes-7255607), like calcium and [potassium](https://www.health.com/hypokalemia-symptoms-7966570).1
The effects of caffeine may vary based on your individual sensitivity and how quickly it is eliminated from your body.
According to the United States Food and Drug Administration (FDA):
- **Safe:** [Up to 400 milligrams (mg) of caffeine per day](https://www.health.com/how-much-coffee-is-too-much-11784279) for most adults.4
- **Too much**: Around 1,200 mg can cause dangerous effects, like seizures.7
Common sources of caffeine include:4
- [**Coffee**](https://www.health.com/food/health-benefits-of-coffee) **(8 oz):** 95-200 mg
- **Energy drink (8 oz):** 70-100 mg
- **Tea (8 oz):** 14-60 mg
- **Soda (12 oz):** 35-45 mg
| What Is the Recommended Magnesium Intake? | |
|---|---|
| **Males (19-30 years)** | 400 mg |
| **Males (31+ years)** | 420 mg |
| **Females (19-30 years)** | 310 mg |
| **Females (31+ years)** | 320 mg |
| **Pregnant people (19-30 years)** | 350 mg |
| **Pregnant people (31-50 years)** | 360 mg |
National Institutes of Health: Office of Dietary Supplements. Magnesium. 
In addition to caffeine, the following factors may reduce your magnesium levels:6
- Poor diet or [malnutrition](https://www.health.com/loss-of-appetite-8731849)
- Fluid loss (such as from heavy sweating or diarrhea)
- Medical conditions that affect nutrient absorption
- [Excessive urination](https://www.health.com/condition/urological-conditions/what-is-polyuria)
- Alcohol use
- Certain medications (e.g., diuretics, laxatives, some chemotherapies)
If you're worried about your magnesium levels, there are several things you can do to [improve magnesium absorption](https://www.health.com/supplements-to-take-with-magnesium-11901903).
### 1\. Eat Magnesium-Rich Foods
[Dietary sources of magnesium](https://www.health.com/foods-high-in-magnesium-11928924) include:1
- Leafy greens (spinach, kale)
- Whole grains (brown rice, oats)
- Nuts and seeds (pumpkin, chia, almonds)
- Legumes (lentils, black beans)
### 2\. Consider Supplements
[Magnesium supplements](https://www.health.com/types-of-magnesium-7853312) come in many forms, such as oxide, citrate, and [glycinate](https://www.health.com/magnesium-glycinate-8415806). Talk to a healthcare provider to determine which supplement and dosage is best for you.1
### 3\. Focus on a Balanced Diet
Other vitamins and minerals may also affect magnesium levels. Eating a nutritious, well-balanced diet can help your body absorb minerals better overall.
To enjoy your morning coffee without compromising magnesium:
- Cut back on caffeine or choose decaf. Decaf coffee still contains some caffeine, but not as much as regular coffee.7
- Stay hydratedto offset caffeine’s [dehydrating](https://www.health.com/dehydration-7376352) effects.
- Eat more [magnesium-rich foods](https://www.health.com/snacks-that-are-high-in-magnesium-11821274) or talk to a medical provider about supplements. |
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