Magnesium Glycinate vs Citrate: Which Is Better?

Glycinate vs Citrate: the main question when choosing magnesium

When a doctor or nutritionist recommends magnesium, the first question is: Which form should you choose? Glycinate and citrate are the two most popular options, but they differ significantly in their mechanism of action, absorption, and side effects. Let's look at each in detail.

Magnesium glycinate (bisglycinate): in-depth analysis

Glycinate is magnesium bound to the amino acid glycine. This is a chelated form: magnesium is “hidden” inside an organic molecule, which protects it from destruction by hydrochloric acid in the stomach and ensures absorption through intestinal amino acid transporters.

Why glycinate is better for sleep and anxiety

The secret is glycine. It is not just a “carrier” of magnesium - it is anindependent inhibitory neurotransmitterthat:

• Binds to glycine receptors in the brain, enhancing inhibition
• Reduces body temperature by 0.3-0.5°C - this is a powerful signal to the brain: “it’s time to sleep”
• Improves subjective sleep quality (study with 3 g glycine before bed)
• Accelerates falling asleep and increases the proportion of deep sleep

Total: you get double effect. Magnesium relaxes muscles and calms the nervous system through GABA and NMDA receptors. Glycine further enhances inhibition and prepares the body for sleep.

Bioavailability and tolerability

• Bioavailability:about 80% - one of the highest among all forms
• Elemental magnesium: ~18% by weight of the compound (2000 mg glycinate = ~200 mg pure Mg)
• Gastrointestinal tract: practically does not cause diarrhea - the main advantage over citrate
• Ideal for:long-term daily use without side effects

Magnesium citrate: in-depth analysis

Citrate is magnesium bound to citric acid. It dissolves well in water (unlike oxide), is quickly absorbed and costs much less than glycinate.

Benefits of citrate

• Bioavailability: about 65% - lower than glycinate, but significantly higher than oxide (4%), carbonate (30%) and sulfate
• Elemental magnesium: ~16% by weight
• Price:1.5-2 times cheaper than glycinate
• Dissolves well - convenient in powder form (Natural Calm and analogues)

Main disadvantage: laxative effect

Magnesium citrate has an osmotic effect - it attracts water into the intestinal lumen. At doses above 300 mg elemental magnesium it may cause:

• Loose stool
• Diarrhea
• Stomach cramps

For people with constipation, this is a plus. For everyone else, this is an unpleasant side effect, which is why many switch to glycinate.

When to choose glycinate

• You take magnesium to improve sleep
• You have anxiety or increased irritability
• You have a sensitive gastrointestinal tract (IBS, gastritis, tendency to diarrhea)
• You need long-term daily usewithout side effects
• You want maximum bioavailability

When to choose citrate

• You need a budget option
• You have problems with constipation (laxative effect = plus)
• You need magnesium for general deficiency
• Do you prefer powder form (dissolves better)
• You take magnesium in the morning (not for sleep)

Is it possible to combine both forms?

Yes, and some experts recommend this particular strategy:

• Morning: Citrate 200 mg - for general replenishment and energy
• Evening: Glycinate 200-400 mg - for relaxation and sleep

Total dosage should not exceed 400 mg of elemental magnesium per day from supplements. Magnesium from food is not included in this limit.

Why NOT oxide

Magnesium oxide is the most common form in pharmaceutical preparations and the most useless for health. Yes, it contains 60% elemental magnesium by weight - sounds impressive. But only 4% is absorbed. From a 400 mg tablet, your body will receive a measly 16 mg.

The only use of the oxide is as an osmotic laxative (Magnesia). It is useless for the nervous system, sleep and anxiety.

How to take it correctly

• Dosage: 200-400 mg elemental magnesium (check the label!)
• Glycinate for sleep:30-60 minutes before bedtime, with food
• Citrate in the morning:with breakfast (reduces the risk of weakness)
• Do not combine with calcium - they compete for absorption (space for 2+ hours)
• Add B6 – improves magnesium transport into cells
• Effect on sleep: after 1-2 weeks. Full effect: 4-6 weeks

Resume from Novird

For most people, glycinate is the best choice. It is absorbed better, does not cause side effects from the gastrointestinal tract, and glycine provides an additional calming bonus. Citrate is a great budget option if you have a strong stomach or problems with constipation.

Golden Rule: Never buy magnesium oxide to supplement a deficiency. If the label says “magnesium oxide,” put it back on the shelf. Overpay for glycinate or citrate and get real results instead of an expensive laxative.