The glycinate is a well absorbed form of magnesium. Threonate is also well absorbed and is able to pass the blood-brain barrier.
Malate and citrate are pretty absorbable too, but I (am not who you were responding to but) use Magnesium bis-glycinate (TRAACS) form. It works well enough.
Keep in mind I am not a doctor or biologist, but many common forms of magnesium, commonly in multivitamins, are absorbed (slowly) via metal channels which require calcium to be taken as well or else the absorption slows and stops. As a result, it will pass through your GI instead of being absorbed into your body.
Malate and citrate are pretty absorbable too, but I (am not who you were responding to but) use Magnesium bis-glycinate (TRAACS) form. It works well enough.
Keep in mind I am not a doctor or biologist, but many common forms of magnesium, commonly in multivitamins, are absorbed (slowly) via metal channels which require calcium to be taken as well or else the absorption slows and stops. As a result, it will pass through your GI instead of being absorbed into your body.