Calm Focus, Compound by Compound
The calm-focus and cognitive compounds
These three are commonly stacked together for focus and calm — worth covering as a group, with honestly different evidence tiers behind each.
L-Theanine
A 2025 meta-analysis of pooled trials found small but consistent improvements in sleep quality and daytime function from L-theanine supplementation. The same calming, non-sedating mechanism is why it's also popularly paired with caffeine for focus: it appears to reduce the jitteriness of caffeine without blunting alertness.
Dose: 100–200 mg; a common pairing ratio is roughly 200 mg theanine to 100 mg caffeine.
Alpha-GPC / Choline
A comprehensive review of choline's role in human health describes it as an essential nutrient — officially recognised as such since 1998 — with wide-ranging roles from cell structure to acetylcholine synthesis (acetylcholine being a brain chemical involved in memory and attention), and notes that typical intake in most populations falls below recommended adequate levels[7]. The Your Brain guide covers acetylcholine's specific role in learning and attention in more depth; Alpha-GPC is a supplemental choline source intended to support that pathway when dietary intake (eggs, liver) is insufficient.
Dose: 300–600 mg, best taken before mentally demanding tasks or exercise.
Food-first option: eggs are a genuinely excellent dietary choline source, and worth prioritising over supplementation if intake is otherwise adequate.
Apigenin
Apigenin (the compound behind chamomile's traditional sleep reputation) has a plausible mechanism but thin isolated-compound human evidence — the closest available human data comes from whole chamomile extract trials, which didn't reach statistical significance on most sleep measures. It's low-risk and reasonable to try, but shouldn't be assumed to carry the same evidence weight as the other supplements in this section.
Section takeaway
L-theanine has the most consistent trial evidence of this trio; choline addresses a genuine, common dietary shortfall; apigenin is the weakest-evidenced of the three despite its popularity — worth trying at low risk, not worth over-trusting.