Different Kinds of Magnesium: Which Form Is Right for You?

Anyone who has looked at a shelf of magnesium supplements has wondered why there are so many different kinds of magnesium, and whether the choice matters. It does.

Magnesium is a mineral, and it can’t go into a capsule on its own. It has to be attached to a partner molecule, such as an amino acid, a natural acid found in fruit, or a simple mineral salt, and the partner gives each kind its name. Magnesium citrate is magnesium attached to citric acid; magnesium malate is magnesium attached to malic acid.

The partner changes how easily your body absorbs the magnesium, how it feels in your digestive system and, in one case, how well it reaches the brain.

Does the family really change absorption? A systematic review of 14 human studies comparing magnesium supplements¹ found that inorganic forms appear to be less bioavailable than organic ones, and that the share absorbed depends on how much magnesium is given. Every form in Focal Evolve’s MightyMag formulas sits in the organic group.

Supplement Facts panels all share one layout. Here is the panel for MightyMag 125 magnesium capsules.

A branded ingredient can also get its own line, as Magtein does on MightyMag Neuro Berry. That line shows the weight of the whole compound; the magnesium it supplies is already counted in the magnesium figure.

Magnesium is a working part of more than 300 enzyme reactions, including the ones that make ATP, the molecule cells run on, and it is needed for normal muscle contraction and nerve signaling, according to a review of magnesium’s roles in the body².

MightyMag 125 is built for everyday magnesium. Each two-capsule serving provides 250 mg magnesium (as Albion di-magnesium malate and TRAACS magnesium lysinate glycinate chelate), plus 828 mg malic acid from the malate form.

The lysinate glycinate is an amino-acid chelate: magnesium held by one lysine and one glycine, two amino acids the gut already has routes to absorb. Because the magnesium travels bound to its partners, chelates are a popular choice for magnesium that is gentle on digestion.

The di-magnesium malate is an organic-acid form: magnesium bound to malic acid, the acid that makes apples tart. Malic acid also takes part in the cycle cells use to turn food into energy, which is why malate is often chosen for energy support.

Magnesium L-threonate is magnesium bound to threonic acid, a compound the body makes when it breaks down vitamin C. Its trademarked version, Magtein, was developed by researchers at MIT to raise magnesium levels in the brain, which tightly controls what crosses into it.

In a six-week randomized trial of Magtein in 100 adults³ aged 18 to 45 who were unhappy with their sleep, the Magtein group improved more than the placebo group on an overall cognition score, most of all in working and episodic memory, and reacted faster.

A 21-day placebo-controlled trial in 80 adults⁴ aged 35 to 55 with self-reported sleep problems tracked sleep with questionnaires and a sleep-tracking ring. The magnesium L-threonate group had better deep and REM sleep scores than the placebo group, and better mood, energy and alertness during the day.

An earlier 30-day trial in 109 healthy adults⁵ tested a Magtein formula that also contained phosphatidylserine and vitamins C and D, and reported higher scores than placebo on every section of a standard memory test.

MightyMag Neuro Berry powder is the Focal Evolve formula built around this form. One scoop (about 2.5 g) provides 200 mg magnesium from three forms: Albion di-magnesium malate, Magtein magnesium L-threonate and TRAACS magnesium lysinate glycinate chelate, including 1 g of Magtein. The two Albion forms round out whole-body support.

Magnesium citrate is magnesium bound to citric acid. It is an organic-acid form that dissolves readily and absorbs well: a study comparing magnesium citrate with magnesium oxide⁶ found that citrate dissolved far better in laboratory tests, and in healthy volunteers it raised urinary magnesium, a sign of how much was absorbed, more than oxide did. The portion that stays in the bowel has a noticeable osmotic effect. That makes citrate the usual choice when the goal is occasional regularity.

#2 regularity formula, from Focal Evolve, uses citrate for exactly that reason. The #2 label lists 200 mg magnesium (as magnesium citrate) per two-capsule serving, plus a 300 mg botanical blend of Triphala extract (three Ayurvedic fruits, standardized to 45% tannins) and Cape aloe leaf (Aloe ferox).

Magnesium oxide, common in low-cost tablets, dissolves poorly and belongs to the inorganic group the review above found less bioavailable. Chloride, sulfate (Epsom salt) and taurate also turn up on labels; the magnesium formulas Aduco carries use none of them.

Both MightyMag formulas share the same two Albion forms; the difference is Magtein, so the choice comes down to your goal. Both belong to the Focal Evolve formula range Aduco carries, alongside #2.

Most healthy adults tolerate magnesium supplements well. Because unabsorbed magnesium draws water into the bowel, loose stools are the effect people most often notice. Magnesium also shares absorption routes with some medicines: a review of magnesium and drug interactions⁷ describes how it can interfere with the absorption of tetracycline antibiotics, and how diuretics and proton-pump inhibitors (acid-reducing drugs) can deplete the body’s magnesium.

Any magnesium product calls for your practitioner’s advice if you have a kidney condition, since the kidneys clear extra magnesium from the body.

Follow the directions on the label or your practitioner’s advice.