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.

Not really sure, I heard that magnesium citrate can have laxative effects. I used to use cal-mag which helped anxiety but it never really “clicked” in my head that it was helping, I used it for muscle cramps.

Haven’t had any issues with citrate. I use natural calm (brand) and tend to take the minimum dose only as needed.

Ditto. I'm using mg orotate for that reason. Haven't tried mg glycinate.

Ive read people recommend glycinate because they find that salt has less laxative effects than the others