Best Time to Take Magnesium: Morning or Night? (By Goal and Type)

How long before bed should you take magnesium?

About 30 to 60 minutes before bed is the usual advice, and what the main recent trial used. That gives a drink or capsule time to settle, and it turns the dose into a cue that the day is over. Our Sleep Complex directions say 30 minutes before bed.

To be honest: no trial has compared one timing with another, so this is a sensible habit, not a proven sweet spot. In a 2025 German trial, adults reporting poor sleep took magnesium bisglycinate 30 to 60 minutes before bedtime for four weeks; the researchers called the effect on insomnia scores small. If it upsets an empty stomach, take it with your evening meal.

• Keep the same time each night. The routine is half of the point.
• Make it a drink. A warm mug can replace a late coffee. See magnesium powder vs tablets.
• Groggy in the morning? Take it earlier or lower the dose. See does magnesium make you sleepy?

Why does magnesium help you sleep?

Magnesium contributes to normal functioning of the nervous system and to normal psychological function. There is no authorised claim that it improves sleep, and the evidence is modest. A 2021 review found just three small trials in older adults: people fell asleep about 17 minutes sooner than on placebo, but the evidence was rated low to very low quality. The surest reason to take it at night is that it anchors a regular wind-down. More in magnesium for sleep.

How much magnesium glycinate for sleep?

The 2025 trial used 250mg of elemental magnesium a day. On a label, look for elemental magnesium, not the weight of the whole compound. The NHS says 400mg or less a day from supplements is unlikely to cause harm. See how much magnesium per day.

Which Evopure product fits your routine?

Choose by when you want to take it (checked October 2026).

Product	Format	When it fits	What to know
Magnesium Glycinate Sleep Complex	Berry drink powder, one 4.75g scoop	Evening, 30 minutes before bed	290mg magnesium from bisglycinate and citrate, with glycine and L-theanine
Reishi Mushroom Adaptogenic Complex	Reishi hot chocolate, 1 to 2 teaspoons	Earlier evening, as a warm drink	Contains a little natural caffeine from the cacao, so have it after dinner rather than at bedtime
Sleep CBD Oil with Passion Flower	Oil, 500mg or 1,000mg	Evening, about an hour before bed	About 4 drops (500mg) or 2 drops (1,000mg) for 10mg of CBD
A morning tablet	Tablet or capsule	With breakfast	We don’t make one. Our best magnesium supplement UK guide covers what to look for

Magnesium contributes to a reduction of tiredness and fatigue. The Sleep Complex also contains chamomile, passionflower, hops and oat straw extracts. New to magnesium? Start with a third of a scoop.

The FSA’s 10mg a day figure is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication.

Value: compare price per serving and the elemental magnesium in each. A pack of our Sleep Complex makes about 30 servings, each with 290mg of magnesium. For Sleep CBD Oil, the 1,000mg bottle is cheaper per mg than the 500mg. Subscribe and Save lowers the price of every delivery; skip, pause or cancel any time.

What you get with Evopure:

• Our CBD products: every batch third-party tested at ISO 17025 labs; request a batch report on our lab testing page.
• Made in the UK, vegan and alcohol-free.
• Sleep CBD Oil is broad spectrum and THC free, and on the FSA public list, linked to validated applications.
• Tracked Royal Mail delivery across the UK, dispatched the same day if you order before 3pm Monday to Thursday (delivery details). Unopened, unused items can be returned within 14 days of delivery (returns policy).

They’re food supplements, not medicines, and we don’t claim they treat any sleep problem. Start with the Sleep Complex for a bedtime drink, the Reishi Cacao for a cup after dinner, or Sleep CBD Oil if you prefer drops.

Morning vs night: which is better?

If you are unsure, the evening is a good default. It fits a wind-down routine and keeps well clear of medicines taken first thing in the morning.

Can I take magnesium glycinate in the morning?

Yes. Your body absorbs glycinate whenever you take it, and the daily total matters more than the hour. Morning suits you if you forget evening doses or split a larger amount. Two exceptions: if you take levothyroxine or alendronic acid before breakfast, take magnesium later (see medicines), and if a morning dose leaves you sleepy, switch to the evening.

Does the time you take magnesium matter?

Less than most people think. Your body absorbs magnesium whenever you take it, and your kidneys clear most of what you don’t use within a day or two. Taking it regularly is what builds your levels, so the best time is the one you can stick to (see how long magnesium stays in your body).

Timing does matter in four cases: a bedtime routine, laxative forms (citrate and oxide), large single doses, and certain antibiotics, bone medicines or thyroid medicine.

Best time to take magnesium by goal

A routine guide, not a rule. If you take medicines, fit it around them (see below).

In short: for stress, split it or take it in the evening; magnesium contributes to normal psychological function (see magnesium for anxiety). For tiredness, any time works; magnesium contributes to a reduction of tiredness and fatigue and to normal muscle function. Citrate and oxide can loosen stools, so take them in the evening (see magnesium for constipation). For PMS, take it daily across your cycle (see magnesium for PMS).

Best time to take each type of magnesium

Glycinate: most people take it 30 to 60 minutes before bed, though morning works too. Glycinate and bisglycinate are the same compound under two names; see magnesium glycinate vs bisglycinate. Our magnesium glycinate guide covers its timing and doses in detail.

Citrate: the BNF lists diarrhoea and soft stools as common side effects at high doses, so take it in the evening, with food if needed. More in our magnesium citrate guide.

Oxide: in a 1990 study, far more magnesium was absorbed from citrate than from oxide, which barely dissolved in water. Compare every form in types of magnesium.

Should you take magnesium with food or on an empty stomach?

Either is fine for most people. Taking it with food makes stomach upset and loose stools less likely, especially with citrate or oxide, and in a 1991 study magnesium from almonds was absorbed as well as from a soluble magnesium salt. Glycinate is gentle enough that many people take it on an empty stomach before bed.

If one way bothers you, switch to the other or lower the dose. The NHS says taking more than 400mg for a short time can cause diarrhoea. More in magnesium side effects.

Should you split your dose?

For larger amounts, it can make sense. Your gut absorbs a smaller share of magnesium as the dose goes up: in a 1991 study, the share absorbed fell from 65% at the lowest dose to 11% at the highest, and larger single doses are more likely to loosen stools.

The BNF doses magnesium citrate for low magnesium three times a day. For a supplement, one dose with a meal and one in the evening works well; a once-a-day evening drink is fine as a single dose. Keep the daily total within the NHS guide of 400mg or less from supplements.

Can you take magnesium with vitamin D, calcium, iron or zinc?

Vitamin D: yes, together is fine

Yes. The NHS says everyone should consider a daily 10 microgram vitamin D supplement in autumn and winter, so many people take both from October. See magnesium and vitamin D for timing and doses.

Calcium: fine at normal doses, space out large ones

Everyday calcium from food is no reason to move your magnesium. Take a large calcium supplement, such as one prescribed for your bones, at a different meal. See magnesium and calcium and our guide to calcium supplements.

Can zinc and magnesium be taken together? Yes, at normal doses

In a metabolic study, 142mg of zinc a day lowered magnesium absorption. That is far above the NHS upper guide of 25mg of zinc a day from supplements, so normal zinc doses are unlikely to matter. If you take both, morning zinc and evening magnesium is an easy split. More in magnesium vs zinc.

Iron: keep a gap

iThe BNF advises taking iron 1 hour before or 2 hours after antacids, which often contain magnesium. If you take iron tablets, keep your magnesium supplement at a different time of day too, and ask your pharmacist if you are on prescribed iron.

How far apart should you take magnesium and medicines?

Magnesium can bind to some medicines in the gut and stop them being absorbed properly. These gaps come from the BNF (British National Formulary), which UK doctors and pharmacists use. Your medicine leaflet and pharmacist have the final word.

What the NHS says: its alendronic acid guidance names supplements containing magnesium and says to wait at least 30 minutes before taking another medicine by mouth. Its levothyroxine and doxycycline pages list indigestion remedies, many of which contain magnesium, as not mixing well.

An easy way to fit it in: the NHS advises taking levothyroxine on an empty stomach 30 to 60 minutes before breakfast, and alendronic acid 30 minutes before breakfast. Evening magnesium leaves a long gap from both.

Acid reflux medicines (PPIs) such as omeprazole and lansoprazole are a different issue. The MHRA warns that long-term use, mostly over a year, can lower magnesium levels, and that over-the-counter PPIs should not be used for more than 4 weeks without seeing a doctor. On a PPI long term? Ask your GP whether to check your magnesium.

iFor any other regular medicine, including blood pressure tablets and antidepressants, check with your GP or pharmacist before you start magnesium.

Should you take magnesium every day, and how long until you notice?

Yes, for most people daily is best, because your body does not store extra magnesium for long. The NHS says adults need 300mg (men) or 270mg (women) a day, mostly from food. Take it daily for at least two to four weeks before judging; some goals take longer. See how long magnesium takes to work for a timeline by goal and type.

When not to take magnesium

• at the same time as the medicines listed above
• if you have kidney disease, unless your doctor agrees
• a laxative form just before travelling or a long meeting
• above 400mg a day from supplements without medical advice
• if it gives you diarrhoea: lower the dose, take it with food or switch to glycinate

iOur products are for adults (18+) only. We don’t recommend our products during pregnancy or breastfeeding. If you take any medication, check with your GP or pharmacist first.

Related guides

• Magnesium L-threonate dosage and timing
• Magnesium spray for sleep
• The best time to take vitamin D
• Zinc supplements: how much, the 25mg limit and what not to mix
• When to take ashwagandha
• Glycinate vs citrate vs threonate
• The best time to take iron tablets
• Brand directions: Wild Nutrition magnesium, New Leaf magnesium glycinate and Healthy Metal magnesium
• An evening drink idea: the sleepy girl mocktail
• Taking reishi as well? Our guide covers the best time to take reishi, morning or night.
• Timing your supplement works best alongside a steady schedule; our guide to the best time to sleep shows bedtimes for every alarm time.
• Taking magnesium for restless legs? See magnesium for restless legs: cream, spray or glycinate.
• Taking it in perimenopause or menopause? See magnesium for menopause: best type, how much and when.
• If you’d rather drink it, our guide to the best magnesium drink for sleep in the UK compares evening powders, shots and cans by magnesium per serving.
• Some brands suggest a time on the pack: Heights magnesium, for example, recommends the evening but says any time works.