I haven't heard mention of glutamic acid, since it's the
precursor to GABA. Does taking glutamic acid increase brain GABA?
I see some products that include it. NOW has a
glutathione product ("Glutathione is a tripeptide, consisting of the three amino acids, cysteine, glutamic acid, and glycine"), though it's billed as an immune system and liver booster, and includes milk thistle.
Country Life has a "
Calcium Magnesium Zinc with L - Glutamic Acid" product.
NOW also sells the L isomer of GABA as a supplement, though I haven't yet found firm evidence that dietary GABA increases brain GABA.
I'm finding references that glutamic acid is a non-essential amino acid, so the body must be able to make GABA in other ways.
Here's
an article that seems to me to be very well written and researched. It claims that increasing serotonin increases GABA too. That might be the safest route, as I'm leary of taking high oral doses of GABA in the hopes that some will cross the blood-brain barrier.
Stephen