Magnesium supplements come in many forms with different absorption profiles and uses. Magnesium types explained helps choose the right form for your needs. Always discuss with healthcare provider before starting supplementation.
Common magnesium forms
Magnesium glycinate (bisglycinate):
- Bound to glycine
- Well-absorbed, gentle on GI
- Often preferred for sleep, anxiety
- Less laxative effect
Magnesium citrate:
- Bound to citric acid
- Good absorption
- Mild laxative effect (helpful for constipation)
- Common all-purpose form
Magnesium oxide:
- Cheap and high elemental magnesium content
- Poorly absorbed
- More likely to cause GI side effects
- Used for constipation, antacid
Magnesium malate:
- Bound to malic acid
- Some claims of energy benefits
- Generally well-tolerated
Magnesium L-threonate:
- Marketed for cognitive benefits
- Animal studies suggest brain bioavailability
- Limited human data
- Expensive
Magnesium taurate:
- Bound to taurine
- Some marketing for cardiovascular use
- Limited specific evidence
Magnesium chloride:
- Used in topical sprays/oils
- Oral form available
- Reasonable absorption
Choosing a form
- General/sleep/anxiety: glycinate
- Constipation: citrate or oxide
- Cognition (uncertain evidence): threonate
- Cardiovascular: any well-absorbed form
- Best value: citrate or glycinate
Dosing considerations
RDA: 310-420 mg daily for adults. Most supplementation: 200-400 mg daily. Higher doses risk diarrhea.
Frequently Asked Questions
What’s the most absorbable magnesium?
Glycinate and citrate generally well-absorbed. Oxide poorly absorbed.
Is magnesium L-threonate worth the cost?
Limited human evidence for unique brain benefits.
Can I take different forms together?
Possible. Watch total daily magnesium.
What if magnesium gives me diarrhea?
Switch to glycinate (less laxative). Reduce dose.
Is topical magnesium absorbed?
Limited evidence for systemic absorption from topical preparations.
The bottom line on magnesium types
Glycinate or citrate for general use. Oxide cheap but poorly absorbed. Match form to your needs. Watch total dose.