Supplements for focus & attention

18 compounds relevant to focus & attention, ranked by overall evidence grade.

Overall grade: Grade A
Last revised: Jul 10, 2026; 18
graded outcomes: 0
references listed

Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.

1 at grade A · 3 at grade B · 11 at grade C · 3 at grade D — 18 graded rows

What is known

Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.

Outcome	Grade	Effect size	Agreement
CaffeineThe most-used and best-evidenced cognitive and physical stimulant on earth — precise dosing and a hard afternoon cutoff are the whole skill.	Evidence grade A	Unclear	mixed
L-TheanineThe calm in green tea — pairs with caffeine to keep the focus and drop the jitter.	Evidence grade B	Unclear	mixed
Bacopa MonnieriThe nootropic that actually improves memory — but slowly, over 8–12 weeks, not on the day you take it.	Evidence grade B	Unclear	mixed
ButterburSolid evidence for migraine prevention and allergic rhinitis — but only PA-free products are safe.	Evidence grade B	Unclear	mixed
L-TyrosineA catecholamine precursor that buffers performance under acute stress and sleep loss — and does little on a normal day.	Evidence grade C	Unclear	mixed
Ginkgo BilobaA circulation-and-memory classic that failed the big dementia-prevention trials — modest, niche, and a bleeding risk.	Evidence grade C	Unclear	mixed
Lion's ManeA mushroom with intriguing nerve-growth mechanisms and a couple of small, promising human cognition trials — early days.	Evidence grade C	Unclear	mixed
Citicoline (CDP-Choline)A choline source with modest attention and memory data — the more evidence-backed of the popular cholinergics.	Evidence grade C	Unclear	mixed
Alpha-GPCA choline donor with a little power-output data and thin cognition evidence outside dementia settings.	Evidence grade C	Unclear	mixed
PhosphatidylserineA membrane phospholipid with old age-related-memory data and a cortisol-blunting angle for stressed athletes.	Evidence grade C	Unclear	mixed
FeverfewA migraine-prevention herb with modest, inconsistent trial support.	Evidence grade C	Unclear	mixed
Huperzine AA potent acetylcholinesterase inhibitor with some dementia data — effectively a drug, not a casual nootropic.	Evidence grade C	Unclear	mixed
Mucuna Pruriens (L-Dopa)A natural L-dopa source with real Parkinson's data — and exactly the drug-interaction risks that implies.	Evidence grade C	Unclear	mixed
SageA culinary herb with small but repeatable acute-memory-and-attention signals.	Evidence grade C	Unclear	mixed
Theacrine (TeaCrine)A caffeine-like purine that gives clean energy and focus with slower tolerance build-up — real but lightly studied.	Evidence grade C	Unclear	mixed
GABA (Supplement)The brain's calming neurotransmitter in a pill — which mostly can't cross into the brain.	Evidence grade D	Unclear	mixed
VinpocetineA cerebral-blood-flow nootropic used as a drug abroad, unproven for healthy cognition and unsafe in pregnancy.	Evidence grade D	Unclear	mixed
PramiracetamA potent racetam with intriguing older memory data but thin, dated human evidence.	Evidence grade D	Unclear	mixed

CaffeineEvidence grade A
The most-used and best-evidenced cognitive and physical stimulant on earth — precise dosing and a hard afternoon cutoff are the whole skill.
Unclearmixed
L-TheanineEvidence grade B
The calm in green tea — pairs with caffeine to keep the focus and drop the jitter.
Unclearmixed
Bacopa MonnieriEvidence grade B
The nootropic that actually improves memory — but slowly, over 8–12 weeks, not on the day you take it.
Unclearmixed
ButterburEvidence grade B
Solid evidence for migraine prevention and allergic rhinitis — but only PA-free products are safe.
Unclearmixed
L-TyrosineEvidence grade C
A catecholamine precursor that buffers performance under acute stress and sleep loss — and does little on a normal day.
Unclearmixed
Ginkgo BilobaEvidence grade C
A circulation-and-memory classic that failed the big dementia-prevention trials — modest, niche, and a bleeding risk.
Unclearmixed
Lion's ManeEvidence grade C
A mushroom with intriguing nerve-growth mechanisms and a couple of small, promising human cognition trials — early days.
Unclearmixed
Citicoline (CDP-Choline)Evidence grade C
A choline source with modest attention and memory data — the more evidence-backed of the popular cholinergics.
Unclearmixed
Alpha-GPCEvidence grade C
A choline donor with a little power-output data and thin cognition evidence outside dementia settings.
Unclearmixed
PhosphatidylserineEvidence grade C
A membrane phospholipid with old age-related-memory data and a cortisol-blunting angle for stressed athletes.
Unclearmixed
FeverfewEvidence grade C
A migraine-prevention herb with modest, inconsistent trial support.
Unclearmixed
Huperzine AEvidence grade C
A potent acetylcholinesterase inhibitor with some dementia data — effectively a drug, not a casual nootropic.
Unclearmixed
Mucuna Pruriens (L-Dopa)Evidence grade C
A natural L-dopa source with real Parkinson's data — and exactly the drug-interaction risks that implies.
Unclearmixed
SageEvidence grade C
A culinary herb with small but repeatable acute-memory-and-attention signals.
Unclearmixed
Theacrine (TeaCrine)Evidence grade C
A caffeine-like purine that gives clean energy and focus with slower tolerance build-up — real but lightly studied.
Unclearmixed
GABA (Supplement)Evidence grade D
The brain's calming neurotransmitter in a pill — which mostly can't cross into the brain.
Unclearmixed
VinpocetineEvidence grade D
A cerebral-blood-flow nootropic used as a drug abroad, unproven for healthy cognition and unsafe in pregnancy.
Unclearmixed
PramiracetamEvidence grade D
A potent racetam with intriguing older memory data but thin, dated human evidence.
Unclearmixed

What is uncertain

Read off the same rows as above. Nothing here is added that the entry does not itself record.

Thin evidence: L-Tyrosine (grade C); Ginkgo Biloba (grade C); Lion's Mane (grade C); Citicoline (CDP-Choline) (grade C); Alpha-GPC (grade C); Phosphatidylserine (grade C); Feverfew (grade C); Huperzine A (grade C); Mucuna Pruriens (L-Dopa) (grade C); Sage (grade C); Theacrine (TeaCrine) (grade C); GABA (Supplement) (grade D); Vinpocetine (grade D); Pramiracetam (grade D).
Studies disagree: Caffeine (mixed agreement); L-Theanine (mixed agreement); Bacopa Monnieri (mixed agreement); Butterbur (mixed agreement).

The evidence in words

The shortlist

Every compound in the knowledge base tagged to focus & attention, ordered by how strong its overall evidence is. Start at the top; the grade is the honest filter.

Worth considering first

Caffeine (A) — The most-used and best-evidenced cognitive and physical stimulant on earth — precise dosing and a hard afternoon cutoff are the whole skill. · L-Theanine (B) — The calm in green tea — pairs with caffeine to keep the focus and drop the jitter. · Bacopa Monnieri (B) — The nootropic that actually improves memory — but slowly, over 8–12 weeks, not on the day you take it. · Butterbur (B) — Solid evidence for migraine prevention and allergic rhinitis — but only PA-free products are safe.

Lower-evidence options

L-Tyrosine (C) — A catecholamine precursor that buffers performance under acute stress and sleep loss — and does little on a normal day. · Ginkgo Biloba (C) — A circulation-and-memory classic that failed the big dementia-prevention trials — modest, niche, and a bleeding risk. · Lion's Mane (C) — A mushroom with intriguing nerve-growth mechanisms and a couple of small, promising human cognition trials — early days. · Citicoline (CDP-Choline) (C) — A choline source with modest attention and memory data — the more evidence-backed of the popular cholinergics. · Alpha-GPC (C) — A choline donor with a little power-output data and thin cognition evidence outside dementia settings. · Phosphatidylserine (C) — A membrane phospholipid with old age-related-memory data and a cortisol-blunting angle for stressed athletes. · Feverfew (C) — A migraine-prevention herb with modest, inconsistent trial support. · Huperzine A (C) — A potent acetylcholinesterase inhibitor with some dementia data — effectively a drug, not a casual nootropic. · Mucuna Pruriens (L-Dopa) (C) — A natural L-dopa source with real Parkinson's data — and exactly the drug-interaction risks that implies. · Sage (C) — A culinary herb with small but repeatable acute-memory-and-attention signals. · Theacrine (TeaCrine) (C) — A caffeine-like purine that gives clean energy and focus with slower tolerance build-up — real but lightly studied. · GABA (Supplement) (D) — The brain's calming neurotransmitter in a pill — which mostly can't cross into the brain. · Vinpocetine (D) — A cerebral-blood-flow nootropic used as a drug abroad, unproven for healthy cognition and unsafe in pregnancy. · Pramiracetam (D) — A potent racetam with intriguing older memory data but thin, dated human evidence.

Goes with

CaffeineGrade AEvidence grade A
L-TheanineGrade BEvidence grade B
Bacopa MonnieriGrade BEvidence grade B
ButterburGrade BEvidence grade B
L-TyrosineGrade CEvidence grade C
Ginkgo BilobaGrade CEvidence grade C
Lion's ManeGrade CEvidence grade C
Citicoline (CDP-Choline)Grade CEvidence grade C

Entries that share this one's tags or conditions.

Bacopa Monnieri for Acute cognitionEvidence grade D — No same-day effectEvidence grade D
Bacopa Monnieri for Memory (chronic)Evidence grade B — Delayed recall; 8–12 weeksEvidence grade B
Bacopa Monnieri: dosage and how to take it300 mg standardized daily, with food, 8–12+ weeks.Evidence grade B
Bacopa Monnieri: side effects, safety & interactionsGenerally safe; GI upset (cramping, loose stools) is common, easing when taken with food. Mild sedative and thyroid-hormEvidence grade B

Sources

This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.

Last revised Jul 10, 2026. A grade is this entry's reading of the evidence, not medical advice.