Posted by Larry Hoover on October 11, 2003, at 9:45:34
In reply to L-Tyrosine, amino molecular-weight champ? ;-) » Larry Hoover, posted by DSCH on October 10, 2003, at 21:08:12
> > > 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
>
> References? Please and thank you? ;-)I'm just firing up a new 'puter, so my links/favourites are not up to speed. I don't know that this is my "best" link, but it covers the information. BTW, it suggests 20% comparative yield, but we're dealing with estimates/educated guesses, in any case.
Lar
http://www.neuroreplete.com/Phenylalanine%20does%20not%20work%20nearly%20as%20well.htm
poster:Larry Hoover
thread:267473
URL: http://www.dr-bob.org/babble/alter/20031003/msgs/268297.html