Magnesium Glycinate vs Citrate
Which Form Is Right for You?
Both are well-absorbed forms of magnesium, but they serve different purposes. Your choice depends on why you are taking it.
Glycinate
Best for sleep and anxiety. Calming. Gentle on the stomach. More expensive.
Citrate
Best for digestion and constipation. Faster acting. Affordable. May cause loose stools.
What Makes Them Different?
Both are magnesium, but the compound it is bonded to changes how your body uses it. Magnesium glycinate is bonded to glycine (an amino acid with its own calming properties). Magnesium citrate is bonded to citric acid (which has a mild osmotic laxative effect).
Magnesium Glycinate
- -Bonded to glycine, an amino acid
- -Glycine has calming, neuroprotective properties
- -Enhances relaxation beyond magnesium alone
- -Gentlest on the stomach (least GI issues)
- -High bioavailability (25 to 35%)
- -Slower release, sustained effect
Magnesium Citrate
- -Bonded to citric acid
- -Mild osmotic laxative effect
- -Effective for constipation relief
- -Comparable bioavailability (25 to 35%)
- -Faster acting
- -More affordable per dose
Head-to-Head Comparison
Scan the left column for your concern and find the right form.
| Factor | Glycinate | Citrate |
|---|---|---|
| Best for | Sleep, anxiety, stress | Digestion, constipation, general repletion |
| Absorption rate | High (25-35%) | High (25-35%) |
| Bioavailability | Excellent | Excellent |
| Release speed | Slower, sustained | Faster acting |
| Side effects | Very rare (mild drowsiness) | Loose stools at higher doses |
| GI tolerance | Excellent (gentlest form) | Moderate (may cause loose stools) |
| Bonus benefit | Glycine aids sleep and calm | Mild osmotic laxative |
| Taste | Neutral, easy to swallow | Slightly tart/acidic |
| Price per dose | $0.15 to $0.40 | $0.05 to $0.20 |
| Overall cost | Higher | Lower |
Which Is Better for Your Concern?
Find your primary reason for taking magnesium.
| Concern | Glycinate | Citrate | Winner |
|---|---|---|---|
| Sleep quality | Excellent (glycine promotes sleep) | Moderate | Glycinate |
| Anxiety and stress | Excellent (calming effect) | Moderate | Glycinate |
| Muscle cramps | Good | Good | Tie |
| Constipation relief | No effect | Excellent (osmotic effect) | Citrate |
| General deficiency | Good | Excellent (fast repletion) | Citrate |
| Migraine prevention | Good | Good | Tie |
| Heart health | Good | Good | Tie |
| GI sensitivity | Best (gentlest form) | May cause loose stools | Glycinate |
| Budget | $0.15 to $0.40/dose | $0.05 to $0.20/dose | Citrate |
Magnesium Glycinate: The Calming Form
Why glycinate is different
Magnesium glycinate is magnesium bonded to glycine, an amino acid that has its own calming and neuroprotective properties. When you take glycinate, you get the benefits of magnesium plus the benefits of glycine. This makes it uniquely effective for sleep, anxiety, and stress relief compared to other forms.
Best for sleep
Glycine acts on NMDA receptors in the brain and may lower core body temperature, both of which promote sleep onset and improve sleep quality. Studies show that 3g of glycine before bed improves subjective sleep quality and reduces daytime sleepiness. A typical magnesium glycinate dose provides 1 to 2g of glycine alongside the magnesium.
Gentlest on the stomach
Of all magnesium forms, glycinate is the least likely to cause digestive side effects. It does not have the osmotic laxative effect of citrate or oxide. If you have a sensitive stomach, IBS, or are prone to loose stools, glycinate is the safest choice.
The trade-off: price
Glycinate is roughly twice the price of citrate per effective dose. This is because the chelation process (bonding magnesium to glycine) is more complex and expensive to manufacture. For sleep and anxiety, the premium is generally worth it. For general magnesium repletion, citrate offers better value.
Magnesium Citrate: The Practical Form
The osmotic laxative effect
Citric acid draws water into the intestines through osmosis. This is why magnesium citrate is commonly recommended for constipation and is even used in higher doses as a bowel prep before medical procedures. At normal supplement doses (200 to 400 mg), this effect is mild but noticeable, especially when starting out.
Best for constipation
If constipation is your primary concern, citrate is the clear winner. The osmotic effect is a feature, not a bug. Start with 100 to 200 mg and increase gradually. Most people find their ideal dose within the first week. Taking it in the morning with water gives the most predictable results.
Affordable and widely available
Citrate is one of the most affordable well-absorbed magnesium forms. It is available at virtually every pharmacy, grocery store, and online retailer. Generic brands offer excellent value at $0.05 to $0.13 per 200 mg elemental dose compared to $0.20 to $0.47 for glycinate.
The trade-off: digestive sensitivity
The same osmotic effect that helps with constipation can cause loose stools or diarrhoea in people who do not need that effect. If you already have regular bowel movements or tend toward loose stools, citrate may not be the best choice. Starting with a low dose and increasing gradually minimises this issue.
Absorption and Bioavailability
25 to 35% bioavailability
Both glycinate and citrate are well-absorbed organic forms. Compare this to just 4 to 5% for magnesium oxide.
What the science says
- -Both are classified as highly bioavailable organic magnesium salts
- -Glycinate may have slightly higher absorption due to amino acid chelate structure
- -Citrate is absorbed quickly; glycinate is absorbed more gradually
- -Both are significantly better absorbed than magnesium oxide
- -Taking with food improves absorption for both forms
- -Splitting doses (morning and evening) is better than one large dose
Dosage Guide by Goal
Recommended Daily Allowance (RDA)
Adult men
400 to 420 mg
Adult women
310 to 320 mg
Pregnant women
350 to 360 mg
Most people get 200 to 300 mg from food, leaving a gap of 100 to 200 mg.
Sleep support
Recommended form
Glycinate
Elemental Mg
200 to 400 mg
When to take
1 to 2 hours before bed
Anxiety and stress
Recommended form
Glycinate
Elemental Mg
200 to 400 mg
When to take
Split: half morning, half evening
Constipation
Recommended form
Citrate
Elemental Mg
200 to 400 mg
When to take
Morning with food
Muscle cramps
Recommended form
Either
Elemental Mg
200 to 400 mg
When to take
With meals, split if possible
General health
Recommended form
Either
Elemental Mg
200 to 400 mg
When to take
With meals, any time of day
Important: Look at "elemental magnesium" on the label, not the total compound weight. A 500 mg magnesium glycinate capsule may contain only 100 mg of elemental magnesium. Doses above refer to elemental magnesium content.
Which Magnesium Do You Need?
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What is your primary goal for taking magnesium?
Price Per Effective Dose
Based on typical retail prices for a 60-capsule bottle.
| Product | Price (60 caps) | Cost per 200mg |
|---|---|---|
| Magnesium Glycinate (generic) | $12 to $18 | $0.20 to $0.30 |
| Magnesium Glycinate (premium) | $20 to $35 | $0.27 to $0.47 |
| Magnesium Citrate (generic) | $6 to $10 | $0.06 to $0.13 |
| Magnesium Citrate (premium) | $12 to $20 | $0.12 to $0.27 |
| Magnesium Oxide (for comparison) | $5 to $8 | $0.04 to $0.07 |
Citrate is roughly half the price of glycinate per effective dose. But if you are taking magnesium for sleep or anxiety, the glycinate premium is worth it for the added glycine benefit and better tolerability.
Other Forms of Magnesium
There are 10+ forms of magnesium. Here is a brief guide to the others.
Magnesium Oxide
Cheapest and worst absorbed (4 to 5% bioavailability). Only useful as a budget laxative. Not recommended for correcting deficiency.
Magnesium Threonate (L-Threonate)
Crosses the blood-brain barrier. Studied for cognitive function, memory, and brain health. The most expensive form.
Magnesium Malate
Bonded to malic acid. May help with energy production and muscle pain. Well-tolerated and reasonably priced.
Magnesium Taurate
Bonded to taurine. Studied for heart health and blood pressure support. Gentle on the stomach.
Magnesium Chloride
Good bioavailability. Available as oil or bath flakes for topical use, or as oral supplements.
Magnesium Sulfate (Epsom Salt)
Primarily for baths and topical use. Poor oral absorption. Useful for muscle soaking, not supplementation.
Safety and Interactions
Glycinate side effects
- -Very few side effects at recommended doses
- -Rare: mild drowsiness (often the desired effect)
- -Almost never causes digestive issues
- -High doses may cause nausea
Citrate side effects
- -Loose stools or diarrhoea (dose-dependent)
- -Feature for constipation, drawback for others
- -Stomach cramps at high doses
- -Start low and increase gradually
Drug interactions (both forms)
- -May affect absorption of certain antibiotics (tetracyclines, fluoroquinolones). Take 2+ hours apart.
- -May interact with bisphosphonates (osteoporosis drugs). Take 2+ hours apart.
- -Diuretics can affect magnesium levels. Consult your doctor about dose adjustments.
- -Kidney disease patients must be cautious with magnesium supplementation.
When to see a doctor
- -Severe symptoms: muscle spasms, irregular heartbeat, numbness, seizures
- -If you take heart medications, diuretics, or antibiotics
- -If you have kidney disease
- -If taking above 400 mg/day of elemental magnesium long-term
- -If symptoms do not improve after 4 to 6 weeks of supplementation
Disclaimer: This website provides general health information for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medications, or have a medical condition.