I find eating more protein on a daily basis helps with energy levels. Many people suggest eating at least 30% more than the recommended daily amount, for crohnnies. If I drink a whey smoothie twice a day, I feel less drained.
I blend up a scoop of unflavored whey (18g protein), a banana, 5 shakes of cinnamon, 20 drops of stevia (1/2 vanilla, 1/2 unflavored), and sometimes a tablespoon of chia into 8oz of filtered water. Once with breakfast, once with dinner.
I also rely on 2 cups of yerba mate in the morning for caffeine that I can handle. I sweeten with a drop of peppermint oil and 8 drops of stevia. I've heard some vague criticisms of a powdered, commercialized form of stevia, erythritol, but I haven't substantiated any problems with stevia extract.
I'm considering trying d-ribose to help maintain energy levels, but I can't say I've personally tryed it. I'll probably try out some 5,000% B12, sublingual tabs every few days, as well. Some people tout the benefits of boosting glutathione levels; I can't say I've pursued this route. I'm always experimenting with supplements.