There are studies showing magnesium OXIDE remains in the bowel, and never gets into the blood stream. It is now used in laxative products because of this information. (Phillips tablets)

SlowMag was designed to replace it and was detailed to doctors, but I guess the message never got thru.

Yes you should replace it. Oxide will do nothing for twitching or other magnesium tasks.

SlowMag or any chelated product will do. (citrate, gluconate, carbonate, malate, taurate).
You can also apply a wonderful lotion version...Morton Epsom lotion --a little goes a long way. Or soak frequently in a tub with epsom salts. I think the lotion is the better solution topically.

This is my magnesium thread.... with all you will ever want to know about the subject:
http://neurotalk.psychcentral.com/thread1138.html

Where can I get the stuff from?

SlowMag is online at Amazon (as is its generic Mag 64)
SlowMag is also at Walmart.
It may be more expensive at other places.

Morton lotion is at Walmart, Walgreen's and online at Amazon.

Epsom salts are sold in most pharmacies in the first aid section.

The other chelates are online at most vitamin places like iherb.com, Puritan's, Swanson's, Vitacost.
Some places are less expensive than others.

Is magnesium glycinate okay?

Yes, the glycinate is fine. Many people use it successfully.

It is only the common OXIDE which seems to persist in many mineral supplements, that you need to avoid.

Would u classify jerking as a
Twitch to ?

I am not sure jerking is a form of twitching. There are myoclonic jerks that are their own thing. Twitching would be more the muscles within the limb.

I can't get the SloMag and other things that you get in the US. I am wondering how much magnesium should one take? I have what is considered a good magnesium supplement here, that has other things in it, but how much should I take per day? And how long do I need to take it before I should see any improvement?