What is the difference between magnesium glycinate and magnesium citrate?

Magnesium glycinate is magnesium bound to the amino acid glycine — highly bioavailable, gentle on the gut, and mildly calming, which makes it the preferred form for sleep, anxiety, and long-term daily use. Magnesium citrate is magnesium bound to citric acid — also well absorbed, but osmotically active in the intestine, which makes it the go-to form for constipation but a poor choice if you're sensitive to loose stools.

Which is better for sleep, glycinate or citrate?

Glycinate. Glycine itself is a mild inhibitory neurotransmitter that lowers core body temperature and improves sleep-onset latency in randomized trials, and the glycinate form is far less likely to cause middle-of-the-night bathroom trips. Take 200–400 mg elemental magnesium as glycinate 60 minutes before bed.

Which is better for constipation, glycinate or citrate?

Citrate. Magnesium citrate pulls water into the colon via osmosis and produces a bowel movement within 6–12 hours at doses of 300–600 mg elemental magnesium. Glycinate does not have this effect at normal doses. If your only goal is regularity, citrate is cheaper and faster.

Which is better for anxiety and stress?

Glycinate — for two reasons. First, gut-friendly forms are dosed higher without side effects, so you actually get the daily 300–400 mg most anxiety trials use. Second, glycine independently reduces sympathetic tone. Citrate can work too, but the laxative effect caps how much most people tolerate.

Which is better for muscle cramps?

Either works, because both are well absorbed. Glycinate is preferred for nightly cramps because you can take it at bedtime without a GI reaction. Citrate is fine for daytime use and often cheaper per mg.

Can I take magnesium glycinate and citrate together?

Yes. A common longevity protocol is 200 mg glycinate at night for sleep plus 100–200 mg citrate in the morning for bowel regularity. Just track total elemental magnesium — the upper limit from supplements is 350 mg/day per NIH, and higher intakes are common but should be built up gradually.

How much elemental magnesium is in each?

Magnesium glycinate is ~14% elemental magnesium by weight (a 1,000 mg glycinate capsule delivers ~140 mg elemental). Magnesium citrate is ~16% elemental (a 1,000 mg citrate capsule delivers ~160 mg elemental). Always read the label for 'elemental magnesium' — that's the number that matters, not the total compound weight.

What is the best time of day to take magnesium?

Glycinate: 60 minutes before bed with food. Citrate: with breakfast if using for constipation, or split across meals if using for daily repletion. Magnesium absorbs better with food and is not affected by caffeine timing.

Are there side effects?

Glycinate: rare, mostly loose stools at doses above 500 mg elemental. Citrate: loose stools, cramping, and urgency at 300+ mg. Both are contraindicated in advanced kidney disease and can interact with certain antibiotics (tetracyclines, quinolones) and bisphosphonates — separate doses by 2 hours.

Which form does the Aevon Blueprint recommend?

For most people building a longevity stack: magnesium glycinate, 200–400 mg elemental at bedtime. Add citrate only if regularity is a concern. See our full supplement guidance in the free Health Assessment.

← All articles

Supplements

Magnesium Glycinate vs Citrate: Which One Should You Actually Take?

They're the two most popular forms of magnesium — and they're not interchangeable. Here's the human evidence on absorption, sleep, anxiety, cramps, and gut side effects, plus a simple rule for picking one.

July 9, 202612 min readReviewed against 25+ peer-reviewed studies

Editorial flat-lay of two amber supplement bottles — magnesium glycinate and magnesium citrate capsules — with rosemary and a glass of water on cream linen

Nearly half of US adults don't hit the daily magnesium target, and the deficit shows up in sleep, blood pressure, insulin sensitivity, and mood. The good news: supplementing works. The catch: the form you pick determines whether it helps you sleep, keeps you regular, or sends you sprinting to the bathroom.

The 30-second answer

• For sleep, anxiety, cramps, daily use: magnesium glycinate, 200–400 mg elemental at bedtime.
• For constipation, occasional relief: magnesium citrate, 200–400 mg elemental with breakfast.
• Doing both? Glycinate at night + low-dose citrate in the morning.
• Skip: magnesium oxide (poor absorption, mostly a laxative).

Side-by-side: glycinate vs citrate

	Glycinate	Citrate
Bioavailability	High (~80%)	High (~65–70%)
Elemental magnesium	~14% by weight	~16% by weight
GI tolerance	Excellent	Loose stools common >300 mg
Sleep & anxiety	Best	Works, but capped by GI
Constipation	Minimal effect	Reliable, 6–12 h
Muscle cramps	Good	Good
Cost / month	$12–20	$6–12
Best time	Bedtime	Morning, with food

How the two forms actually differ

Both glycinate and citrate are "chelated" magnesium — the mineral is bound to a carrier molecule that improves absorption compared with cheap oxide or sulfate forms. What's different is the carrier itself, and the carrier does something.

Glycine (the carrier in glycinate) is an inhibitory neurotransmitter. It lowers core body temperature, quiets sympathetic tone, and modestly improves sleep onset in randomized trials — even without magnesium.
Citrate (the carrier in citrate) is a Krebs-cycle intermediate that is osmotically active in the gut. It pulls water into the colon, which is why citrate works for constipation and glycinate doesn't.

Same mineral, opposite side profiles. The choice is almost never about absorption — it's about which side effect you want.

Sleep: the case for glycinate

The 2022 BMC Complementary Medicine systematic review of magnesium and sleep found modest but consistent improvements in sleep quality and insomnia severity across seven trials, with the largest effect in older adults. In practice, glycinate is the form used in most of those protocols because it can be dosed at 300–400 mg elemental nightly without GI issues. Add the independent sleep-onset effect of glycine and it becomes the default longevity-stack pick.

Protocol: 200 mg elemental (usually ~1,500 mg glycinate) 60 minutes before bed. If HRV data shows no change after two weeks, step to 400 mg.

Constipation: the case for citrate

Citrate is the most-studied over-the-counter osmotic laxative and works for both occasional and chronic constipation. A 300–600 mg elemental dose produces a bowel movement within 6–12 hours in most people. Glycinate has almost no laxative effect because glycine isn't osmotically active in the same way.

Protocol: 200 mg elemental with breakfast for daily regularity, or up to 400 mg for occasional relief. Drink 500 ml of water with the dose.

Anxiety, stress, and mood

A 2017 meta-analysis in Nutrients found supplemental magnesium modestly improves anxiety scores in populations with low baseline intake. Trials used 200–400 mg elemental daily for 4–8 weeks. Glycinate wins here for a boring reason: at that dose, citrate creates too many bathroom breaks for consistent adherence.

Muscle cramps and exercise

Both forms work equivalently for exercise-associated cramps and post-training recovery because absorption is comparable. Pick whichever fits your schedule — glycinate if you train in the evening and want the sleep benefit, citrate if you already need a morning regularity aid.

What about the other forms?

Magnesium threonate: crosses the blood-brain barrier; small trials suggest cognitive benefit. Expensive; use only if that's the goal.
Magnesium malate: paired with malic acid; anecdotal for fatigue and fibromyalgia; thin RCT data.
Magnesium oxide: cheap, ~4% absorbed, mostly a laxative. Skip.
Magnesium sulfate (Epsom): for baths only; oral use is a harsh laxative.
Magnesium taurate: paired with taurine; promising for cardiovascular use, limited trials.

How to pick in 10 seconds

Trouble sleeping, anxious, or stacking for longevity? → Glycinate, 200–400 mg at night.
Constipated? → Citrate, 200–400 mg with breakfast.
Both problems? → Glycinate at night + citrate in the morning.
Neither, just want the daily dose? → Glycinate. Better GI tolerance, easier to sustain.

Dose, timing, and safety

The RDA for magnesium is 400–420 mg/day (men) and 310–320 mg/day (women). NIH's Upper Limit for supplemental magnesium is 350 mg/day, but this refers to acute diarrhea risk from single-source doses, not total intake. Diet + supplement combined, most longevity protocols land at 400–500 mg/day elemental total.

Take with food for best absorption and lowest GI risk.
Separate from tetracyclines, quinolones, and bisphosphonates by 2 hours.
Contraindicated in advanced kidney disease — clear it with your clinician first.
Signs of too much: persistent loose stools, cramping, low blood pressure, muscle weakness.

Get a personalized supplement stack

Take the free 3-minute Aevon Assessment and get a Wellness Score, biological age estimate, and a preview of the exact supplement stack — dose, timing, and form — matched to your goals.

Start the free assessment

FAQ

Educational content only. Aevon Health is a wellness platform, not a medical provider. Consult a qualified clinician before starting any supplement — especially if you have kidney disease, take prescription medication, or are pregnant.

Keep reading

Editorial flat-lay of an amber supplement bottle, a scoop of white creatine powder, rosemary, a glass of water, and chalk-dusted dumbbells on cream linen

Supplements

Creatine Benefits for Women: What the Evidence Actually Shows

For 30 years creatine was marketed to male lifters. The last decade of research has quietly made it one of the best-supported supplements for women — strength, cognition, bone, and healthy aging, without the bulk.

Read →

Editorial flat-lay of an amber supplement bottle with white taurine capsules, a small scoop of white powder, rosemary sprig and a glass of water on cream linen

Supplements

Taurine Benefits: What the Human Evidence Actually Shows

Taurine went from energy-drink filler to one of the most-studied longevity molecules of the decade. Here's what the human trials prove — heart, mitochondria, metabolism, aging — and how to dose it.

Read →

Editorial flat-lay of an unlabeled amber supplement bottle with white NR capsules and a rosemary sprig on cream linen

Supplements

NR Supplement: The Complete Guide to Nicotinamide Riboside

NR is the most human-tested NAD+ precursor on the market. Here's what 15 randomized trials actually show — dose, timing, side effects, and how it compares to NMN.

Read →

Try the tools