Posted by Larry Hoover on October 10, 2003, at 19:49:41
In reply to L-Tyrosine vs. L-Phenylalanine » Larry Hoover, posted by DSCH on October 10, 2003, at 19:24:15
> Larry,
>
> Previous threads on PB on amino acid supplemention weren't very clear on this point and I'd like you to comment on it if you may: if increased synthesis of dopamine and norepinepherine is desired, which amino acid is generally the most effective?Tyrosine, hands down. They each have similar molecular weight, so you can compare them by weight. The "yield" from phenylalanine, in terms of dopamine, is no more than 25% that of tyrosine, and may be less than that, due to variables such as genetic factors, dietary history, vitamin stutus, etc.
So, 500 mg tyrosine has the effect of at least 2 grams phenylalanine, from a dopamine-synthesis perspective.
Lar
poster:Larry Hoover
thread:267473
URL: http://www.dr-bob.org/babble/alter/20031003/msgs/268052.html