my kid is 11yrs old, stammering for last 3-4 yrs, B1 did nothing to him. I ordered many thainine gummies as well, did nothing , I just ordered some magnisium for him. when he stay home , he watch tv , stammering returns, more he out , more school he goes , stammering stops. sometimes he become so fluent like he did not a what the stammering is, I try to keep him busy in many things , sometimes work , sometimes not, sometimes therapy works , sometimes not , but I know one thing , whenever he behave confident , stammering goes, when he is emotional (he is very very emotional , sensitive in nature just like her mother, ) stammering comes back. this formula always works. I decided to put him in gym soon , he will start building some muscles , he will grow stronger so I am dead sure stammering will go away . I am regular gym going person for last 20 yrs , I never found a stress buster, confidence booster more than weight lifting and buffed body.