Several of the blend members have decent literature behind them. That literature is about doses, and the doses here are not published, so the two cannot be joined up. It is still worth knowing what the names are known for.
Bacopa monnieri has a 2014 meta-analysis in the Journal of Ethnopharmacology by Kongkeaw and colleagues. The trials it pooled used standardised extract, most commonly around 300 mg a day, and ran for at least twelve weeks. Shorter courses and smaller doses did not show the same effect, which makes the twelve-week requirement as important as the dose.
Green tea and L-theanine have the most directly relevant recent work. A 2025 review by Payne and colleagues in Nutrition Reviews examined tea, L-theanine, and L-theanine with caffeine on cognition, sleep and mood in healthy people. The clearest signals were short-term and attention-related rather than long-term.
Berberine is the best studied name in the blend and the one least likely to be present at a studied amount. The NCCIH notes gastrointestinal side effects and says berberine may be unsafe during pregnancy or breastfeeding. Trials generally use 500 mg to 1,500 mg daily, split across doses.
Ginkgo biloba, bilberry, alpha lipoic acid, GPC choline, lutein and zeaxanthin each have their own literature, and none of it can be applied here for the same reason. Lutein and zeaxanthin in particular are eye-health ingredients that sit oddly on a label sold for digestion, energy and clarity.