lookin for mag supplement ASAP

Hi folks,
I live down the street from the pharmacy and I'm thinking of going there and picking up a magnesium supplement. It's Walgreens, if that helps anyone. I'm looking for advice on a brand. I'm not a fan of starting ANYTHING wihtout my LLMD knowing but he's not in the office, I"m MAJORLY constipated, I'm guessing from having such a low carb diet....and not having enough magnesium. I'm feeling very impulsive and a bit messy today....but I think maybe if i get a magnesium supplement and start taking it NOW things will improve this weekend.....

what do you think? I already take a magnesium citrate supplement - I could jsut increase that.

Or do you think I should go pure magnesium? Understanding that brands at Walgreens probably aren't going to be pure. ....
thoughts? Time is of the essence...I need help with this asap.

many thanks, comrades!

So magnesium glycinate (or biglycinate) is the best I was told.

But - if you're wanting the laxative qualities - then it's not the one to take.
You can take a lot of the glycinate form and it won't have you running to the bathroom....

We use mag citrate at a rate of 600 mg per day. 150 morning, 150 afternoon, 300 at night. I find this to be just below bowel tolerance. Much more than that causes loose stools.

It's cheap too, but we do use a lot of gelatin powder, which is a good source of glycine (needed by the body for endoginous production of glutathione). If you are not eating much gelatin/bone broth it might be a good idea to use mag glycinate.