What is the best form of magnesium?

8 forms compared by what actually reaches your bloodstream. Absorption ranges from 15% to 95% — a difference that matters more than the milligrams on the label.

0 forms

0 best absorption %

0 average %

Ranked by absorption

Higher means more of the dose reaches you

Magnesium L-Threonate 95 Magnesium Glycinate 90 Vitamin C (Magnesium Ascorbate) 85 ZMA (Zinc + Magnesium + B6) 75 Magnesium Chloride 50 Magnesium Malate 40 Magnesium Citrate 35 Magnesium Oxide 15

Short answer

Magnesium L-Threonate absorbs best — 95%.

Brain health & cognitive enhancement. Typical dose 2000-4000 mg, about $120 a month. The cheapest option is Magnesium Oxide at $8, but it only absorbs at 15%.

See Magnesium L-Threonate

Every form side by side

Form	Absorbed	Safety	Per month	Dose	Evidence
Magnesium L-Threonate	95%	8/10	$120	2000-4000 mg	B
Magnesium Glycinate	90%	9/10	$25	200-600 mg	A
Vitamin C (Magnesium Ascorbate)	85%	9/10	$20	500-2000 mg	A
ZMA (Zinc + Magnesium + B6)	75%	8/10	$25	ZMA formula before bed	B
Magnesium Chloride	50%	8/10	$20	200-600 mg oral + topical	A
Magnesium Malate	40%	9/10	$35	600-1200 mg	B
Magnesium Citrate	35%	8/10	$15	300-600 mg	A
Magnesium Oxide	15%	7/10	$8	400-800 mg	A

Head to head

15 comparisons

Magnesium Glycinate vs Magnesium Oxide 90% · 15% Magnesium Citrate vs Magnesium Oxide 35% · 15% Magnesium Malate vs Magnesium Oxide 40% · 15% Magnesium Chloride vs Magnesium Oxide 50% · 15% Magnesium Oxide vs ZMA (Zinc + Magnesium + B6) 15% · 75% Magnesium Citrate vs Magnesium Glycinate 35% · 90% Magnesium Glycinate vs Magnesium Malate 90% · 40% Magnesium Chloride vs Magnesium Glycinate 50% · 90% Magnesium Glycinate vs ZMA (Zinc + Magnesium + B6) 90% · 75% Magnesium Citrate vs Magnesium Malate 35% · 40% Magnesium Chloride vs Magnesium Citrate 50% · 35% Magnesium Citrate vs ZMA (Zinc + Magnesium + B6) 35% · 75% Magnesium Chloride vs Magnesium Malate 50% · 40% Magnesium Malate vs ZMA (Zinc + Magnesium + B6) 40% · 75% Magnesium Chloride vs ZMA (Zinc + Magnesium + B6) 50% · 75%

How to read this

Absorption is the share of the dose that reaches your bloodstream — the number that decides whether the milligrams on the label mean anything.
A cheaper form at half the absorption is not cheaper per unit delivered.
Safety here reflects tolerance at normal doses, not toxicity risk.
Evidence A means the form itself was studied, not just the parent compound.

Common questions

What is the best form of magnesium?

Magnesium L-Threonate — it absorbs at 95%, the highest of the 8 forms here. Brain health & cognitive enhancement. Typical dose 2000-4000 mg.

Which form of magnesium is worst absorbed?

Magnesium Oxide at 15%. It is usually the cheapest option, which is exactly why it ends up in budget products.

Is the expensive form of magnesium worth it?

Compare per unit delivered, not per bottle. Magnesium Oxide costs $8 a month at 15% absorption, Magnesium L-Threonate costs $120 at 95%.

How much magnesium should you take?

Doses differ by form: Magnesium L-Threonate 2000-4000 mg; Magnesium Glycinate 200-600 mg; Vitamin C (Magnesium Ascorbate) 500-2000 mg; ZMA (Zinc + Magnesium + B6) ZMA formula before bed.