I have been able to take rather large doses of Tyrosine and NALT up to like 5-6 times the recommended dose or more and I've been feeling just fine on those doses. I took around 3300 mg of NALT in one day and noticed each capsule of like 350 mg each was only lasting like 30 mins in my system.
I am super down-regulated to dopamine and I've had a long history of amphetamine abuse, but I've been trying NALT because I have felt anhedonic for weeks now.
My doctor didn't know jack about supplements or herbals when I asked, so I just said whatever and started testing things out on my own because he was taking forever to get back to me and I didn't want to wait for his own ADHD self to finally remember to contact me back just to say "I don't know."
So I became the scientist and the participant in my own experiment so-to-speak.