I take a number of OTC medications including R-Alpha Lipoic Acid (the "R" is important: R-Alpha Lipoic Acid is the better choice because it is the naturally occurring, biologically active form of the antioxidant that your body produces and uses making it significantly more potent and bioavailable than standard Alpha Lipoic Acid which is often a synthetic mix).
With the R-Lipoic Acid, first thing in the morning on an empty stomach, I also take Acetyl L-Carnitine. Studies by the National Institute of Health indicate that this combination may improve age-related metabolic decline, support nerve and cognitive health, and help manage blood sugar regulation.
Regarding Magnesium Glycinate, I was advised to take it after eating (because of stomach issues) so I take it after breakfast.
Just because the above works for me (along with a number of other supplements) doesn't mean it would work for you. I spent much time researching the supplements that "could" help my IPN. Once I had the supplements I researched timing of the supplements and "strengths" of each supplement. Once I had my list together, along with my prescribed medications, I met with a hospital's physician (both an MD and a PharmD) to go over my list to (1) insure that I was getting the most out of what I was consuming on a daily basis and (2) insure there was no conflict with amount(s), timing and my prescribed medications. I received his "blessing" and did not need to change anything!