CBD and Magnesium: Can You Take Them Together? (2026 Guide)

Last updated: September 2026.

The short answer

Yes. For most healthy adults, CBD and magnesium can be taken together, and there is no known interaction between them. Many people take both in the evening as part of a wind-down routine for sleep. Magnesium glycinate is the most popular form to pair with CBD because it is gentle on the stomach. Keep supplemental magnesium to 250mg a day or less unless your doctor advises otherwise, and check with your doctor or pharmacist first if you take regular medication.

Below we cover what each one does, why people combine them, which magnesium to choose, how much to take, when to take it, and who should be careful.

What is CBD?

CBD (cannabidiol) is a natural compound from the hemp plant. It does not cause a “high”. It works with the body’s endocannabinoid system, a network of receptors involved in keeping the body in balance, including around rest and stress. Most people take CBD as an oil under the tongue. Our 10% CBD oil gives 5mg per drop, and most customers start with 5 drops a day.

What is magnesium?

Magnesium is an essential mineral involved in more than 300 processes in the body. Unlike CBD, magnesium has official EU-approved health claims. Magnesium contributes to:

• the normal functioning of the nervous system
• normal psychological function
• normal muscle function
• the reduction of tiredness and fatigue
• normal energy-yielding metabolism
• the maintenance of normal bones and teeth

You get magnesium from leafy greens, nuts, seeds, beans and whole grains. The European Food Safety Authority suggests an adequate intake of about 350mg a day for men and 300mg a day for women from all sources. Dietary surveys suggest many adults fall short, especially people with busy, stressful lives who rely on processed food.

Why do people take CBD and magnesium together?

Mostly for sleep and for winding down after a stressful day. The two work in different ways. Magnesium supports the normal functioning of the nervous system and muscles, and is involved in the body’s calming GABA pathways. CBD works through the endocannabinoid system. Many of our customers find that taking both in the evening helps them switch off.

There are no clinical trials yet on CBD and magnesium taken together, so be wary of any claim that the combination is “proven”. What we have is research on each one separately, and a lot of positive experience from people who use both.

What does the research say?

CBD and sleep

In a large case series from a US clinic (Shannon et al., 2019), 72 adults with worry and poor sleep took CBD alongside their usual care. Most reported feeling calmer in the first month, and sleep scores improved at first for about two-thirds, although the sleep results were less consistent over time. A 2021 real-world study from a Canadian clinic (Rapin et al.) also found that many people reported better sleep and wellbeing with CBD. These were not placebo-controlled trials, so they show promise rather than proof.

Magnesium and sleep

Magnesium has been studied for sleep for decades. Reviews (for example Al Alawi et al., 2018) describe its roles in the nervous system and muscle relaxation. Small trials, mostly in older adults, have reported better sleep quality with magnesium supplements, but the evidence is mixed and larger trials are needed. It is most likely to help people who are low in magnesium to begin with.

Which magnesium is best to take with CBD?

• Magnesium glycinate (bisglycinate): the most popular choice for evenings and sleep. It is well absorbed and gentle on the stomach, and glycine is itself often taken before bed.
• Magnesium citrate: well absorbed and good value, but can loosen the bowels at higher doses.
• Magnesium L-threonate: marketed for the brain and focus. More expensive, with less research.
• Magnesium oxide: cheap and common in pharmacies, but poorly absorbed. Not our pick.

So if you are searching for “CBD and magnesium glycinate”, you are on the right track: it is the form most people pair with CBD.

How much CBD and magnesium should you take?

• CBD: most people start with about 25mg a day, which is 5 drops of our 10% oil, and adjust slowly. Our CBD dosing guide explains how to find your amount.
• Magnesium: supplements usually give 100mg to 250mg of elemental magnesium a day. The EU sets a safe upper level of 250mg a day for supplemental magnesium (on top of food). Check the label for the elemental magnesium figure, not the total weight of the compound.

When should you take them?

For sleep, most people take both about an hour before bed: magnesium with a small snack or a glass of water, and CBD drops held under the tongue for 60 to 90 seconds. Some people prefer CBD in the morning for daytime calm, and magnesium in the evening. There is no wrong answer; pick a routine and stick with it for a few weeks.

A simple evening routine

• An hour before bed: magnesium glycinate with a glass of water.
• Screens off, lights low.
• 30 minutes before bed: your CBD drops under the tongue.
• Same time every night, including weekends.

Is it safe to take CBD and magnesium together?

There is no known interaction between CBD and magnesium, and both are generally well tolerated. The most common side effects are mild: loose stools with too much magnesium, and a dry mouth or drowsiness with CBD. Check with your doctor or pharmacist first if:

• You take regular medication. CBD is processed by liver enzymes that also handle many common medicines.
• You take antibiotics (such as tetracyclines or quinolones), osteoporosis medicines (bisphosphonates) or thyroid medication. Magnesium can reduce their absorption, so they are usually taken at least two hours apart.
• You have kidney problems, as your body may not clear extra magnesium properly.
• You are pregnant or breastfeeding.

What about CBN for sleep?

CBN is another hemp cannabinoid that people use specifically for sleep. Our CBN Snooze Oil combines CBN with CBD and CBC in one night-time oil. It does not contain magnesium, so if you like the idea of both, take your magnesium separately. You can read more in our guide to CBN vs CBD for sleep.

Magnesium-rich foods to eat alongside

Supplements top you up, but food comes first. Good Irish-kitchen sources of magnesium include:

• Pumpkin seeds and sunflower seeds (a small handful is one of the richest sources)
• Almonds, cashews and peanut butter
• Spinach, kale and other leafy greens
• Oats, brown bread and other whole grains
• Beans, lentils and chickpeas
• Dark chocolate (70% or more)
• Salmon and mackerel

A bowl of porridge with seeds for breakfast, or a handful of nuts in the afternoon, makes a real difference over a week.

Signs you might be low in magnesium

Only a blood test can tell you for sure, but people who are low in magnesium often notice things like muscle cramps or twitches (especially at night), tiredness, poor sleep and feeling on edge. These signs have many other causes too, so if they go on for a while, see your GP rather than guessing.

CBD and magnesium vs melatonin

Melatonin is the hormone that tells your body it is night-time. In Ireland it is prescription-only, so it is not something you can simply buy in a shop or online here. That is one reason many Irish people look at CBD and magnesium instead: both are food supplements you can add to an evening routine. They work very differently from melatonin, so if you have a diagnosed sleep problem, talk to your GP about the options.

Magnesium and women

Many women take magnesium through the month and around menopause. Magnesium contributes to the reduction of tiredness and fatigue, normal psychological function and the maintenance of normal bones, which is why it is often part of women’s supplement routines. If you are pregnant, trying to conceive or going through menopause, talk to your GP or pharmacist about the right dose for you.

Frequently asked questions

Can you take CBD and magnesium together?

Yes. There is no known interaction between them, and many people take both in the evening. If you take regular medication, check with your doctor or pharmacist first.

Can you take CBD and magnesium glycinate together?

Yes. Magnesium glycinate is the most popular form to take with CBD, especially at night, because it is well absorbed and gentle on the stomach.

Do CBD and magnesium work better together for sleep?

There are no studies on the combination yet. Each has been studied on its own for rest and relaxation, and many people find the two fit well into a night-time routine. Give any routine a few weeks before judging it.

How long before bed should I take them?

Most people take magnesium about an hour before bed and CBD drops around 30 minutes before bed.

Can I take magnesium in the morning and CBD at night?

Yes. Timing is flexible. Some people prefer magnesium in the morning and CBD at night, or the other way round. Consistency matters more than timing.

Where to buy CBD oil in Ireland

Dr. Hemp Me has been helping Irish customers since 2018. Every batch of our CBD oil is third-party lab tested for cannabinoids, heavy metals and pesticides, and the lab report is on each product page. Browse our range of CBD oils, and order before 2pm for next-day delivery anywhere in Ireland (free over €50).

Disclaimer: CBD and magnesium are sold as food supplements. They are not intended to diagnose, treat, cure or prevent any disease, and are not a substitute for a varied diet or medical advice. Always consult a healthcare professional before starting a new supplement, especially if you take medication.

References

1. Shannon, Scott et al. (2019) “Cannabidiol in Anxiety and Sleep: A Large Case Series.” The Permanente Journal
2. Rapin, Lucile et al. (2021) “Cannabidiol use and effectiveness: real-world evidence from a Canadian medical cannabis clinic.” Journal of Cannabis Research
3. Al Alawi, Abdullah M et al. (2018) “Magnesium and Human Health: Perspectives and Research Directions.” International Journal of Endocrinology
4. Parazzini, Fabio et al. (2017) “Magnesium in the gynecological practice: a literature review.” Magnesium Research
5. European Commission, EU Register of nutrition and health claims (magnesium).