Gaba is made from the amino acids taurine and glutamine by the body. Glutamine is officially a non-essential amino acid but in certain very stressful situations the body cannot make it itself. However it can be obtained from food. Glutamine is found in meats but glutamine deficiency is rare even in vegetarians because glutamine can be found in such foods as legumes, hemp seeds, chia seeds, and raw cabbage and beets.
Caffeine and alcohol as well as MSG and other processed glutamates play havoc with the body’s Gaba/glutamine balance and cause unhappy addictive cycles. I will come back to this later. I personally used alcohol and caffeine for many years of my life and did some healing of my brain chemistry with the temporary used of gaba supplements. Once the healthier brain chemistry is restored, the gaba supplements become unnecessary. I have seen ohers similarly helped.
The thing to understand is, for people who feel the pleasurable state after a cup of tea or coffee or alcoholic drink - like i did for years -once your brain chemistry is healed you feel as good as this ALL THE TIME and you can function well and sustainably in this state.
For more information on healing brain chemistry I recommend Gabriel Cousens’ book Conscious Eating’