l carnitine vs l carnitine l tartrate L-Carnitine Old School Labs 4-in-1 Liquid

Primary Benefits: Reduces "brain fog" and enhances mental focus

The compound's ability to support liver function also contributes to clearer skin, as a healthy liver is better able to process and eliminate toxins that might otherwise manifest as skin problems

J Biol Chem 274(17):1145511458

Persistent adverse effects after a B12 injection warrant evaluation rather than reassurance that its normal. How Should You Decide If B12 Injections Are Right for You

An empty stomach generally allows for better absorption of certain nutrients because there is no competition from food

(what science says) The short answer is yesvitamin B12 shots do work, but their effectiveness depends heavily on who is receiving them and why