Magnesium Glycinate vs Citrate for Sleep: Which Is Better?

Table of Contents

• What's actually different between the two forms?
• Does one absorb better than the other?
• Which one should you actually take?
• A few things worth knowing before you buy
• Frequently Asked Questions

Short answer: magnesium glycinate is generally better absorbed and gentler on the stomach, which is why it's the more common choice for sleep. Magnesium citrate is absorbed reasonably well too, but it has a laxative effect at higher doses that can work against a settled night. Neither is a sleep drug — both simply help top up magnesium levels, and magnesium contributes to the reduction of tiredness and fatigue and to normal muscle function.

What's actually different between the two forms?

Magnesium on its own isn't very soluble, so supplements bind it to a "carrier" compound to help your gut absorb it. Glycinate binds magnesium to glycine, an amino acid; citrate binds it to citric acid. The carrier changes how the body handles it more than most labels let on.

Glycine itself is calming in its own right, which is part of why glycinate is the more popular pick for an evening dose — you get the magnesium plus a carrier that doesn't fight against winding down. Citrate, by contrast, draws water into the gut, which is exactly why it's also sold as a mild laxative. At a modest dose that's rarely noticeable; at a higher one, it can mean a disrupted night for a different reason entirely.

Double Magnesium — 376mg per daily dose from bisglycinate and oxide

Does one absorb better than the other?

Both are considered more bioavailable than older, cheaper forms like magnesium oxide. Glycinate has a slight edge for sustained absorption without gut upset, which is why it tends to be recommended for daily, ongoing use rather than occasional top-ups. The NHS page on vitamins and minerals confirms magnesium's role in normal muscle and bone function, and notes that most adults should be able to get what they need from a varied diet — a supplement is for filling a gap, not replacing one.

Watch Out: if you take regular prescription medication — particularly for blood pressure — speak to your GP or pharmacist before adding a new magnesium supplement, since it can interact with some of these.

Which one should you actually take?

• Take glycinate if: you want a daily evening supplement and have a sensitive stomach.
• Take citrate if: you're also dealing with occasional constipation and don't mind the mild laxative effect.
• Skip both if: your diet already covers your magnesium needs — leafy greens, nuts, seeds and wholegrains are all decent sources, and the NHS is clear that most adults meet their needs through food alone.

Pro Tip: take your dose at roughly the same time each evening. Consistency does more for how well it works than the exact form you choose.

A few things worth knowing before you buy

Check the elemental magnesium amount on the label, not just the total tablet weight — a "1000mg magnesium glycinate" tablet might contain a fraction of that as actual magnesium, since the glycine carrier makes up much of the mass. Look for a brand that states this figure plainly rather than burying it in a proprietary blend.

Our own Double Magnesium combines bisglycinate and oxide to give 376mg of elemental magnesium per daily dose, with every amount printed on the label — no proprietary blends. Magnesium contributes to normal psychological function, normal muscle function, and the reduction of tiredness and fatigue.

Frequently Asked Questions

Can I take magnesium glycinate every night?

Most people can take it daily as part of a consistent routine. Stick to the labelled dose and check with a pharmacist if you're on other medication.

How long before magnesium helps with sleep?

Effects vary — some people notice a difference within a week, others need a full month of consistent use before judging it fairly.

Is magnesium citrate bad for sleep?

Not inherently, but its laxative effect means some people find it disruptive at bedtime. If that happens, try glycinate instead or move your dose earlier in the day.

Where can I check how much magnesium I actually need?

The NHS vitamins and minerals guide sets out UK daily reference intakes and is a reliable starting point before adding any supplement.