When it comes to magnesium supplements, my personal preference is magnesium threonate. It seems to be most efficient at penetrating cell membranes, including your mitochondria, which can help boost your energy level. It also penetrates your blood-brain barrier and may help improve memory.
If you struggle with headaches or migraines, magnesium threonate may be a good alternative for that reason as well. (For headaches and migraines, make sure you’re getting enough vitamin B12 and Coenzyme Q10 as well.)
Read this entire article for more information.