Amino acids sometimes have the opposite effect in some people. All comes down to body chemistry.

Maybe someone correct me but as far as I know both of these usually worked in opposite of most people.

Theanine is supposed to be calming. So that could do it. Tyrosine is usually energetic.

Google Those and see what they do for the average person.

Keep in mind that amino acids compete for transport (into the brain), so there's a good chance one is cancelling the other out.

There is not much research into the specifics between them but I'm going to guess that L-theanine cancels out much of the L-Tyrosine, since your husband is sleepy and L-theanine makes most people sleepy or relaxed.

Whereas L-Tyrosine is used for focus and energy.

we are all effected differently - but i would say theanine - unless taken in huge amounts - typically just makes it a little easier to relax - rather than actually make you sleepy - unless perhaps its already near bedtime - in which cases that's what its supposed to do

theanine is the amino acid in tea that is associated with its relaxing properties - and that counteracts the caffeine to some extent

i think there is something like 50 to 100mg of theanine in a cup of English tea -

supplement doses are typically in the 100-200mg range -

so it would be unusual if these normal doses - like a few cups of tea - were causing pronounced fatigue

how much is he taking ?

They will cancel each other out I’ve taken at the same time.

That wouldn’t be much different than taking a sleeping pill and a caffeinated beverage at the same time, it would be pointless.

Amino acids are often used in the same ways Adaptogenic herbs are.
Meaning if you’re taking two with opposing results it’s usually because during the day you may have opposing symptoms. In that case you take them a good time apart.

Example, it’s not uncommon for people who have adrenal cortisol issues to have opposing symptoms at different times of the day. Meaning they may need something that decreases the energy in the mornings for their cortisol is going crazy high) and something that increases cortisol in the afternoon (when it’s at an all time low) , this is going to be possibly six hours apart.

Perhaps this is what the LLMD was meaning but did not explain it well?

Post Edited (astroman) : 7/31/2022 3:29:17 PM (GMT-7)