My son, age 5, has Apraxia (a speech disorder in which a person has trouble saying what he or she wants to say correctly and consistently). After many years of not getting anywhere with his condition, I did some research and found a study on Methyl B-12 shots. It involved Apraxia patients and Autism patients. The study results were amazing. All of the patients made huge progress and some were even fully cured. I thought it was worth a shot. Although I couldn't get his medical doctor to give him shots, she did recommend a supplement. I did more research and found Superior Source. I talked with his doctor again and she suggested giving him 5,000 mcg two times a day. She said that would be equivalent to giving him a sub-q shot daily. After the 1st week, he started making new sounds, and his other words became clear. After just 2 1/2 weeks, he started using full sentences. He is improving everyday. We highly recommend this product!