I think you will only see a big boost in energy from glutathione and methylcobalamin if you have the MTHFR gene mutation. It's a good idea to get tested for that. I'm going to on my next visit to my LLMD.
Remember that glutathione doesn't absorb well because the stomach tends to degrade it before it can absorb into the bloodstream so if you can't do IV then go for liposomal glutathione like one called ReadiSorb. It's not cheap but a very important antioxidant needed for detoxification.
You can also give rhodiola a shot. It's helpful for energy as well as memory and mood. I tend to like the New Chapter brand -300mg.