Whether this helps your sleep or stress levels depends on a question science hasn't fully answered: can oral **GABA** meaningfully cross the blood-brain barrier? At 500mg per capsule, you're getting well above the 100–300mg range used in the limited clinical studies, but the evidence for supplemental GABA reaching the brain is mixed.

The suggested use of one to two capsules daily puts you at 500–1,000mg. If GABA does produce effects through peripheral pathways or the gut-brain axis, the dose is generous. The capsule format makes it easy to start with one and adjust based on how you respond.

The main caveat is the evidence base itself. Clinical trials on oral GABA are sparse, and results vary considerably between individuals. If you try this for relaxation or sleep, give it a few weeks to evaluate — but know that the science behind it is still catching up to the marketing.