Jim, I bought Dymatize Xpand Caffiene Free, even without the caffiene it still gave me heart palpitations, in looking thru the ingredients it looks like it was the Tyrosine. It also made me real alert which was probably also the Tyrosine. Not sure how much is in Xpand but it looks like a lot, what do you think about buying Tyrosine on its own and taking a small amount?
Yes, it likely is the tyrosine. This amino acid is a building block in the body for adrenaline (epinephrine) and norepinephrine, which are stimulating neurotransmitters/hormones. But yes, tyrosine makes a great way to ramp up your attention and mental focus.