Walk into any pharmacy or scroll any supplement site and you'll find both magnesium glycinate and magnesium citrate recommended, often by the same brand, sometimes on the same shelf. Both are considered good forms of magnesium. Neither is automatically "better" in every situation, because they're absorbed differently, tolerated differently, and genuinely suited to different goals. It's exactly why we chose magnesium glycinate specifically for CHOOZY: the highest-absorption, most gut-friendly option, and the one best suited to daily use for sleep and muscle recovery, rather than the occasional, targeted job citrate is better known for. Here's how they actually compare.
What Each Form Actually Is
Magnesium citrate is magnesium bound to citric acid, the same acid found naturally in citrus fruit. It's highly soluble in water, which is part of why it's absorbed reasonably efficiently and why it's the form most commonly used in over-the-counter laxative products.
Magnesium glycinate (or bisglycinate) is magnesium chelated to glycine, an amino acid rather than an acid salt. That chelation allows it to be absorbed via a different intestinal pathway, one that doesn't rely on drawing water into the gut the way citrate does. It's this pathway, and the higher absorption and gentler digestion that come with it, that made glycinate the obvious choice when we formulated CHOOZY Magnesium Glycinate.
Absorption: What the Evidence Actually Says
Here's the honest answer, and it's more nuanced than most comparison articles let on: there has never been a published clinical trial directly comparing magnesium glycinate and magnesium citrate head-to-head for absorption in humans. Most of what gets cited as "glycinate absorbs better" comes from laboratory modelling and comparisons against magnesium oxide specifically, not a clean citrate-versus-glycinate trial.
What the available evidence does suggest is that both forms absorb considerably better than poorly soluble forms like magnesium oxide. In lab modelling, magnesium glycinate showed efficient absorption under both fasted and fed conditions, while magnesium citrate showed moderate absorption that improved when taken with food. Citrate's water solubility allows for reasonably efficient passive absorption, and the citrate component itself may help form soluble complexes that aid uptake further.
So while glycinate likely has a modest edge, both forms are genuinely well absorbed. Raw bioavailability isn't actually where the meaningful difference between them lies. That modest edge, combined with how gently it sits with most people, is exactly why CHOOZY Magnesium Glycinate is built on this form rather than citrate: it's the highest-absorption option that still works reliably as a daily supplement.
The Real Difference: How Your Gut Handles Each One
This is where the two forms actually diverge in a way that matters day to day. Magnesium citrate works partly by increasing osmotic pressure in the intestines, drawing water into the bowel to soften stool and stimulate movement. That's precisely why it's sold as a laxative, and it's an intentional, well-understood mechanism, not a side effect. But it means that at higher doses, or in more sensitive individuals, citrate can cause loose stools or digestive urgency even when that's not what you were going for.
Magnesium glycinate's glycine-based transport pathway largely sidesteps this. Because it isn't relying on the same osmotic pull, it tends to be far gentler on digestion, which is exactly why it's the form most consistently recommended for daily, ongoing use rather than occasional, targeted use. It's the reason CHOOZY Magnesium Glycinate is formulated as a genuinely gut-friendly daily supplement, one you can take every night without it interfering with digestion the way a citrate-based product might.
What Magnesium Citrate Is Actually Best For
Citrate earns its place for specific, deliberate purposes. For occasional constipation, standard dosing (typically taken as a liquid solution with a full glass of water) usually produces a bowel movement within 30 minutes to 6 hours, which is precisely the outcome it's designed for. It isn't intended for long-term, chronic constipation management, and repeated high-dose use can risk dehydration or electrolyte imbalance.
Citrate has also been studied specifically for migraine prevention: one trial using 600mg of oral magnesium citrate daily found a significant reduction in both migraine frequency and severity, with particular benefit noted for migraine with aura and menstrually related migraine.
What Magnesium Glycinate Is Actually Best For
Glycinate is the form to reach for when you want magnesium as part of your everyday routine rather than for a specific, short-term digestive purpose. Its gentler tolerability profile makes it the more practical choice for consistent daily supplementation aimed at sleep quality, nervous system support, muscle recovery, and general magnesium status, the kinds of benefits that depend on taking a supplement reliably over weeks and months, not a single dose.
If your goal is "I want to top up my magnesium every day without it affecting my digestion," glycinate is very clearly the better-suited tool for that specific job.
Side by Side
Magnesium Citrate:
Absorption: good, and improves further when taken with food
Digestive tolerance: can cause loose stools or urgency, especially at higher doses
Best suited for: occasional constipation relief, and studied specifically for migraine prevention
Typical use case: short-term and targeted
Sedative or calming association: not typically associated with this form
Magnesium Glycinate:
Absorption: good to very good, and consistent whether taken fasted or with food
Digestive tolerance: generally gentle, with minimal GI effect for most people
Best suited for: daily, ongoing supplementation, which is exactly why CHOOZY builds its Magnesium Glycinate around this form
Typical use case: long-term and routine, supporting sleep and muscle recovery night after night
Sedative or calming association: commonly associated, partly via the calming effect of glycine itself
Can You Take Both?
Yes, they're not mutually exclusive, they're just suited to different jobs. Someone might take CHOOZY Magnesium Glycinate daily for general supplementation, sleep support, and muscle recovery, and reach for citrate only occasionally if they need short-term digestive relief. There's no meaningful benefit to combining both forms every single day if your goal is simply consistent daily magnesium intake; picking the one form that matches your actual goal is the more sensible approach.
Where CHOOZY Stands
We chose glycinate, specifically and deliberately, because CHOOZY Magnesium Glycinate is designed to be taken daily, not occasionally, and daily use is exactly where glycinate's tolerability advantage matters most.
Ingredients: Magnesium Bisglycinate (Chelated, Pure, Unbuffered). Capsule Shell: Hydroxypropyl Methylcellulose (Vegan).
Free From: Plastic, Magnesium Oxide, Carbonate, Additives, Excipients, and Gluten, with no fillers or sweeteners.
Certifications: Vegan certified, Gluten-free (batch tested), Third-party tested, Nutritionist-approved formulation.
Nutritional Info (Per Daily Intake): 155mg Elemental Magnesium, 41% of the Reference Intake (based on UK guidance of 375mg daily).
Manufactured in the UK and third-party tested for magnesium content and heavy metals including lead, cadmium, mercury, and arsenic. In keeping with the rest of our range, it's also packaged entirely plastic-free and home compostable.
FAQs
Is magnesium glycinate or citrate better absorbed?
Neither has been directly compared in a published human trial. Lab modelling suggests glycinate may have a modest edge, particularly on an empty stomach, but both absorb considerably better than poorly soluble forms like magnesium oxide.
Which magnesium is best for sleep, glycinate or citrate?
Glycinate is more commonly recommended for sleep, partly due to its gentler digestive profile for nightly use and partly because glycine itself has calming, sleep-supportive properties independent of the magnesium.
Does magnesium citrate always cause diarrhoea?
Not always, but it's more likely at higher doses due to its osmotic mechanism, which is also exactly why it's used deliberately as a laxative. Sensitivity varies by individual.
Can I switch from citrate to glycinate?
Yes, there's no issue switching forms. Many people use citrate only occasionally for digestive relief and glycinate for their regular daily supplementation, since the two serve different practical purposes.
Is one form of magnesium safer than the other?
Both are considered safe within recommended intake levels. Citrate's laxative effect is a normal, expected mechanism rather than a safety concern, but it does make it less suited to daily, long-term use than glycinate for most people.
