I am told i hour before and 2 hours after. Hope this answers your question..

I have been using one hour before or after and have good results.

My husbands doctor said 1/2 hour before eating protein. Take it with a cracker

Am told half an hour either side..

As I understand it, it is one half hour BEFORE eating or two hours AFTER eating.
I take C/L 5x a day 25/200 and C/L 10/100 3X a day. I will say this does pretty good for me as long as I get a LOT of sleep and limited challenges. Too much excitement, and I pay. Too much activity, I pay. BUT I also have a bad attitude about not being able to go full throttle, balls to the wall. This is a good portion of our animated discussions 😉🙄😏 Family says....slow down! Me....🚀 therein lies the problem. Right after I jumped off the top of our camper ( I honestly thought I was closer to the ground) and hit the ground my husband had a talk with me. He asked me if l would feel better with a broken bone to go with my PD. I quietly nodded no.
I am trying