Although studies are limited, there is some research to suggest a relationship between Vitamin B12 deficiency, fatigue, depression and foggy brain (Ref) Who is at risk for Vitamin B12 deficiency
More economical: While the initial cost of vitamin injections may be higher than over-the-counter pills, the 100% absorption rate and medical supervision make them a more cost-effective option
In addition, future research must pay closer attention to biological moderators, such as sex, age, genetic background, and early-life stress
L-ascorbic acid might be the most researched, but I never got to see any results from it because it was so irritating
Once synthesized, it is distributed through the bloodstream and becomes highly concentrated in tissues that demand massive amounts of continuous energy, specifically the skeletal muscles and the myocardium (heart muscle), which contain over 95% of the body's total carnitine stores