KandyWandy: Magnesium Glycinate: Benefits, Side Effects, Dosage and the Best Time to Take It

Magnesium Glycinate: Benefits, Side Effects, Dosage and the Best Time to Take It

Magnesium rich foods including almonds seeds avocado and leafy greens

Magnesium glycinate has become one of the most popular forms of magnesium supplement, particularly among people looking for help with sleep, relaxation, muscle function or correcting a low magnesium intake.

It is often promoted online as a particularly gentle and highly absorbable form of magnesium. You may also see claims that magnesium glycinate can improve sleep, reduce anxiety, prevent muscle cramps or provide numerous other health benefits.

Some of these claims are more strongly supported than others.

Magnesium itself is an essential mineral involved in hundreds of processes throughout the body. Your muscles, nerves, bones, heart and many enzymes depend on an adequate supply.

But that does not mean everyone needs a magnesium supplement, nor does it mean magnesium glycinate can treat every symptom associated with poor sleep, stress or muscle discomfort.

This guide explains what magnesium glycinate is, its potential benefits, how it differs from other forms of magnesium, possible side effects, when people commonly take it and who should be particularly careful with supplementation.

What Is Magnesium Glycinate?

Magnesium glycinate, sometimes called magnesium bisglycinate, is a supplement in which magnesium is combined with the amino acid glycine.

Different forms of magnesium are used in supplements because magnesium needs to be combined with another substance to create a stable compound.

Common supplemental forms include:

Magnesium glycinate
Magnesium citrate
Magnesium oxide
Magnesium chloride
Magnesium lactate

These forms can differ in how well they dissolve and are absorbed, how much elemental magnesium they provide and how likely they are to cause gastrointestinal side effects.

Magnesium glycinate is frequently chosen by people who want a form that may be easier on the digestive system than some alternatives.

What Does Magnesium Do in Your Body?

Magnesium is essential for normal health.

It contributes to processes including:

Normal muscle function
Normal nerve function
Energy production
Protein synthesis
DNA production
Blood glucose regulation
Blood pressure regulation
Bone development
Normal heart rhythm

Most magnesium in the body is stored in bones and soft tissues rather than circulating freely in the bloodstream.

The goal is therefore to obtain enough magnesium for normal body function — not to consume increasingly large amounts in the hope of obtaining additional benefits.

What Are the Potential Benefits of Magnesium Glycinate?

The benefits of magnesium supplementation depend heavily on whether someone is getting enough magnesium in the first place.

Correcting inadequate magnesium intake or deficiency is different from taking extra magnesium when your body already has an adequate supply.

Here are some of the main reasons people consider magnesium glycinate.

1. Correcting Low Magnesium Intake

The clearest reason to use a magnesium supplement is to help address inadequate magnesium intake or clinically relevant deficiency when supplementation is appropriate.

People can obtain magnesium naturally from many foods, including:

Nuts
Seeds
Beans
Lentils
Whole grains
Leafy green vegetables
Some dairy products

A balanced diet should generally remain the foundation of magnesium intake.

However, individual circumstances can sometimes make supplementation appropriate.

2. Magnesium Glycinate and Sleep

One of the biggest reasons people search for magnesium glycinate is sleep.

Magnesium is involved in normal nervous-system function, and researchers have investigated whether supplementation could improve sleep.

Some studies suggest an association between magnesium status and sleep, and supplementation may help certain people, particularly when magnesium intake is inadequate.

However, the evidence is not strong enough to describe magnesium glycinate as a guaranteed treatment for insomnia.

Sleep problems can have numerous causes, including:

Stress
Anxiety
Menopause
Sleep apnoea
Pain
Alcohol
Caffeine
Medications
Irregular sleep schedules
Other medical conditions

If insomnia is persistent, simply adding a supplement may not address the underlying problem.

3. Magnesium and Muscle Function

Magnesium plays an important role in normal muscle contraction and relaxation.

For that reason, magnesium supplements are frequently marketed for muscle cramps.

But muscle cramps have many potential causes, and magnesium supplementation does not necessarily prevent or cure cramps in everyone.

Persistent, severe or unexplained muscle cramps should be evaluated rather than automatically assumed to indicate magnesium deficiency.

4. Magnesium and Bone Health

Magnesium contributes to healthy bone structure and mineral metabolism.

Bone health, however, depends on considerably more than one mineral.

Important factors include:

Calcium
Vitamin D
Protein
Physical activity
Hormonal health
Age
Smoking and alcohol habits
Certain medications and medical conditions

Taking magnesium should therefore not be viewed as a substitute for an overall bone-health strategy.

5. Magnesium and Blood Pressure

Magnesium is involved in normal blood pressure regulation.

Research has examined whether magnesium supplementation can modestly influence blood pressure in some people.

However, magnesium supplements should not replace prescribed blood-pressure medication or appropriate medical treatment.

If you have high blood pressure, discuss supplements with your healthcare professional, particularly if you take medication.

6. Magnesium and Blood Sugar

Magnesium participates in glucose metabolism and insulin function.

Low magnesium status is more common among some people with metabolic conditions, including type 2 diabetes.

However, magnesium glycinate should not be marketed as a treatment or cure for diabetes.

People with diabetes should continue appropriate medical treatment and discuss supplementation with their healthcare professional when necessary.

Does Magnesium Glycinate Help With Anxiety?

Magnesium is involved in nervous-system function, which has led to considerable interest in magnesium supplements for stress and anxiety.

Some research suggests magnesium supplementation may influence subjective anxiety or stress in certain circumstances, but the evidence remains limited and varies between studies.

Magnesium glycinate should therefore not be presented as a replacement for established treatment of an anxiety disorder.

If anxiety is persistent, severe or interfering with daily life, professional assessment may be more useful than relying solely on supplements.

Does Magnesium Glycinate Make You Sleepy?

Magnesium glycinate is not a sleeping pill.

Some people report feeling more relaxed after taking it, which may explain why it is commonly taken in the evening.

But not everyone experiences sleepiness.

You should not expect magnesium glycinate to act like a sedative that immediately makes you fall asleep.

What Is the Best Time to Take Magnesium Glycinate?

There is no universally required time of day for everyone.

Some people choose to take magnesium glycinate in the evening because they associate it with their bedtime routine.

Others take it with a meal earlier in the day.

Consistency and tolerability can be more important than finding a supposedly perfect hour.

If your healthcare professional has recommended magnesium for a specific medical reason, follow the instructions they provide.

Certain medicines also need to be separated from magnesium supplements because magnesium can interfere with their absorption.

Should You Take Magnesium Glycinate With Food?

Magnesium supplements can generally be taken with food, and doing so may make them easier to tolerate for some people.

Follow the instructions provided with the particular supplement and any advice given by your healthcare professional.

Remember that the amount listed for the entire magnesium compound is not necessarily the same as the amount of elemental magnesium it provides.

The supplement label should indicate how much actual magnesium is contained in a serving.

How Much Magnesium Do You Need Per Day?

Magnesium requirements vary according to age and sex.

According to the U.S. National Institutes of Health Office of Dietary Supplements, recommended dietary allowances for adults are generally:

Men aged 19–30: 400 mg per day
Men aged 31 and older: 420 mg per day
Women aged 19–30: 310 mg per day
Women aged 31 and older: 320 mg per day

Requirements differ during pregnancy.

These figures refer to total magnesium requirements from food, beverages and supplements, not a recommendation to take that entire amount as a magnesium glycinate supplement.

That distinction is extremely important.

How Much Magnesium Glycinate Should You Take?

Do not confuse the recommended daily magnesium intake with a supplement dose.

For adults, the U.S. National Institutes of Health lists an upper limit of 350 mg per day of magnesium from dietary supplements and medications unless otherwise directed by a healthcare professional.

This upper limit does not include magnesium naturally present in food.

Also pay attention to elemental magnesium.

For example, a product may advertise a large number of milligrams of “magnesium glycinate” on the front of the bottle while providing a much smaller quantity of elemental magnesium.

The elemental magnesium amount is the number that matters when comparing your magnesium intake.

Individual treatment for an actual magnesium deficiency may differ and should be medically guided.

Magnesium Glycinate vs Magnesium Citrate

Both are commonly used forms, but they are not identical.

Magnesium Glycinate

Magnesium is combined with glycine.

It is commonly chosen when someone wants a magnesium supplement that may be relatively well tolerated gastrointestinally.

Magnesium Citrate

Magnesium is combined with citric acid.

It is generally well absorbed but can have a stronger effect on the bowels in some people.

Magnesium citrate is also used in certain products intended to relieve constipation.

The “best” form therefore depends on why someone is taking magnesium and how their body tolerates it.

Magnesium Glycinate vs Magnesium Oxide

Magnesium oxide is another common and often inexpensive form.

It contains a relatively high proportion of elemental magnesium by weight, but its absorption characteristics differ from some other forms.

It can also have gastrointestinal effects.

A higher number printed on the front of a supplement bottle does not necessarily mean the product will deliver more usable magnesium.

Does Magnesium Glycinate Cause Diarrhoea?

Magnesium supplements can cause gastrointestinal side effects, particularly at higher supplemental doses.

Possible effects include:

Diarrhoea
Nausea
Abdominal cramping

Magnesium glycinate is often chosen because it may be better tolerated by some people, but digestive side effects are still possible.

If supplementation repeatedly causes diarrhoea or other significant symptoms, discuss this with a healthcare professional.

Can Magnesium Glycinate Cause Other Side Effects?

At appropriate doses, magnesium supplements are generally tolerated by many healthy adults.

However, excessive magnesium can become dangerous.

Very high magnesium levels may cause problems such as:

Nausea
Weakness
Low blood pressure
Confusion
Abnormal heart rhythm
Breathing difficulties

Severe magnesium toxicity can be life-threatening.

This is particularly important for people whose kidneys cannot efficiently remove excess magnesium.

Magnesium Glycinate and Kidney Problems

The kidneys play a major role in controlling magnesium levels.

People with significantly impaired kidney function may be unable to remove excess magnesium effectively.

That can allow magnesium to accumulate in the bloodstream.

If you have kidney disease or reduced kidney function, do not begin high-dose magnesium supplementation without discussing it with an appropriate healthcare professional.

Can Magnesium Interact With Medicines?

Yes.

Magnesium supplements can interfere with the absorption or effectiveness of some medicines.

Examples include certain:

Antibiotics
Osteoporosis medicines
Diuretics
Acid-reducing medicines

Timing may need to be adjusted so that magnesium and particular medicines are not taken together.

If you regularly take prescription medicines, check with your pharmacist or healthcare professional before beginning a magnesium supplement.

Who Should Be Particularly Careful With Magnesium Supplements?

Speak with an appropriate healthcare professional before supplementation if you:

Have kidney disease
Take several prescription medicines
Have significant gastrointestinal disease
Are pregnant or breastfeeding and are unsure about supplementation
Already take other products containing magnesium
Have been advised to restrict certain minerals
Are considering very high doses

Also check multivitamins, antacids and laxatives because some products may already contain magnesium.

It is possible to unintentionally take magnesium from several different products at the same time.

Can You Get Enough Magnesium From Food?

Many people can obtain substantial amounts of magnesium through food.

Good sources include:

Pumpkin seeds
Chia seeds
Almonds
Cashews
Peanuts
Beans
Lentils
Spinach and other leafy greens
Whole grains
Avocado
Some fortified foods

Food provides magnesium alongside protein, fibre, healthy fats and other nutrients.

Supplements can be useful in appropriate circumstances, but they should not automatically replace a varied diet.

Frequently Asked Questions

Is Magnesium Glycinate Good for Sleep?

It may help some people, particularly when magnesium intake is inadequate, but current evidence does not establish magnesium glycinate as a reliable cure for insomnia.

Persistent sleep problems should be investigated for their underlying cause.

How Long Before Bed Should You Take Magnesium Glycinate?

There is no scientifically established perfect interval that everyone needs to follow.

Some people take it during the evening as part of their bedtime routine. Follow the product directions or advice from your healthcare professional.

Can You Take Magnesium Glycinate Every Day?

Some people use magnesium supplements daily, but whether you need one and the appropriate amount depend on your diet, health and other sources of magnesium.

More is not necessarily better.

Does Magnesium Glycinate Help With Stress?

Magnesium is necessary for normal nervous-system function, and some research has investigated supplementation for stress and anxiety.

Evidence is not strong enough to treat magnesium glycinate as a replacement for appropriate mental-health care.

Is Magnesium Glycinate Better Than Magnesium Citrate?

Not universally.

Magnesium glycinate may be preferred by people seeking good gastrointestinal tolerability, while magnesium citrate may be chosen in circumstances where its bowel effects are useful.

The most appropriate form depends on your individual reason for taking it.

Can Magnesium Glycinate Help With Constipation?

Magnesium can affect bowel movements, but magnesium citrate is more commonly associated with a laxative effect.

Persistent constipation should not automatically be treated with increasing doses of magnesium.

Can Magnesium Glycinate Lower Blood Pressure?

Magnesium supplementation may have modest effects on blood pressure in some people, but it should never replace prescribed antihypertensive treatment.

Is Magnesium Safe for Your Kidneys?

Healthy kidneys normally help regulate magnesium.

People with impaired kidney function can have greater difficulty removing excess magnesium and should seek professional advice before taking significant supplemental doses.

The Bottom Line

Magnesium glycinate is a popular form of magnesium supplement that combines magnesium with the amino acid glycine.

Magnesium itself is essential for normal muscle, nerve, bone, metabolic and cardiovascular function, and supplementation can be useful when dietary intake is inadequate or deficiency needs to be corrected.

Magnesium glycinate may also be easier on the digestive system for some people than certain other forms.

However, many online claims go beyond what research has established.

It is not a guaranteed treatment for insomnia, anxiety, muscle cramps, high blood pressure or other medical conditions.

Pay attention to the amount of elemental magnesium in a supplement rather than simply the larger number displayed for the magnesium compound.

And remember that supplements can cause side effects, interact with medicines and become particularly problematic when kidney function is impaired.

The goal is to obtain enough magnesium — not as much magnesium as possible.

Sources and Further Reading

National Institutes of Health Office of Dietary Supplements — Magnesium Fact Sheet for Health Professionals

https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/

National Institutes of Health Office of Dietary Supplements — Magnesium Consumer Information

https://ods.od.nih.gov/factsheets/Magnesium-Consumer/

MedlinePlus — Magnesium in Diet

https://medlineplus.gov/ency/article/002423.htm

National Center for Complementary and Integrative Health — Sleep Disorders and Complementary Health Approaches

https://www.nccih.nih.gov/health/sleep-disorders-in-depth

Medical Disclaimer

This article is for general educational and informational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. Speak with an appropriate healthcare professional before taking magnesium supplements if you have kidney disease, take prescription medicines, are pregnant or breastfeeding, or have another medical condition.