In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet
Nobody has measured whether ordinary human doses reach MAO-A-inhibiting concentrations
Examining B12 Shots & Injections: Shedding Light on the Definite Reasons Why Would You Need B12 Injections and Exploring Alternatives
L-Carnitine L-Tartrate Fatty-acid transport (no internal link in map)
This may be a big problem, especially for those with gastrointestinal issues, such as certain conditions that prevent someones body from absorbing various minerals and vitamins