I take B-12 5000 mcg Super Strength Sublingual Liquid to help relieve my stress, anxiety, and to maintain my energy levels. I am not a police officer, but I do deal with 10 special needs children who have behavioral issues and are on the Autism Spectrum. So, naturally my patience is tested on a daily basis. I started taking B-12 in liquid form over three years ago. I can tell when I do not have my daily dose, so it works! B-12 is a water soluble vitamin, so you don't need to worry about vitamin intoxication. Your body will excrete what it does not need or use. I started to notice a notable change after 2 weeks.