This product makes me stammer, hard.

This product makes me stammer, hard. Hello, I had a stutter growing up that I realized was a stammer later, through eating healthy and exercise this diminished severely. Today I am fluid and have been for a very long time. My wife brought home the product shown here, taking this I have had a really bad stammer for about a week. I stopped taking it and within a few days it was gone. I reviewed all possibilities (stress, work, anxiousness, food, no exercise, etc) and there were no changes besides the powder/supplement my wife purchased. I say all of this to say, are there products you stay away from that increase the rate/risk of stutter/stammer in your life?