Hi Janet

If found this message response from Dr Kellon on the subject in the archives:

Would you consider supplementing L-Tyrosine & phenylalanine useful in horses with PPID?

Dr Kellon's reply: These amino acids are interconvertible and required for dopamine synthesis. We've actually had a few members try this and there was no effect, likely because the problem is death of the neurons, not amino acid deficiency.

https://ecir.groups.io/g/main/message/148896

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Nancy C in NH
ECIR Moderator 2003
ECIR Group Inc. President/Treasurer  2021-2022