Still taking vitamin B12 injections? Move over shot. A pill may be just as good. Dr. Leslie Greenberg's Blog Are B12 injections worth it?, Vitamin B12 shots are openly advertised as a quick fix option to boost energy and metabolism, and in some cases claim to help you to shed weight. Unless you have a B12 Your body needs vitamin B12 to keep blood cells healthy and to make your nerves work right. Here are some signs that you're low on this vitamin: https: wb.md 3zgZPuM Frontiers Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta analysis