I just bought some magnesium citrate gummies to help with constipation from kratom. How much should I take, how many times a day, and what time of day?

My digestive system has been really bothering me for a week or two. I've been taking half plant, half extract. I'm pretty sure it's the plant material that's bothering me (I'll know by the end of today, all my doses are going to only be extract and I'm not going to eat troublesome foods). Either way I need to do something to fix it. Magnesium citrate was the most suggested thing to try when I searched yesterday.

I pooped this morning. So I got a nice reset, and my system at the moment. I live in the US, so it's afternoon right now. Should I take some now or wait until tonight?

Update: I took some a couple times since I made this post, I definitely feel better already. Starting with 150mg twice a day. I'll up the dose a bit after I see how this works out

Update 2: My digestive tract has been dandy all day :) I'm so happy about this right now