Lion's Mane and Nerve Growth Factor
Lion's mane mushroom is studied for possible stimulation of nerve growth factor, with small human trials and typical doses of 1–3 grams
2 September 2026Read →
Bacopa, rhodiola, L-theanine, ginseng and BCAA: what each is studied for, at what dose, and what that research does not establish.
Lion's mane mushroom is studied for possible stimulation of nerve growth factor, with small human trials and typical doses of 1–3 grams
B vitamins lower homocysteine, and elevated homocysteine is associated with cognitive decline — but supplementing in people without def
Omega-3 fatty acids, particularly DHA, are structural components of brain cell membranes, though supplement trials for cognition in hea
Ginkgo biloba has been studied extensively for memory and dementia prevention, and the largest trials have generally not found meaningf
Acetylcholine is a neurotransmitter involved in memory, and choline is its dietary precursor — the reasoning behind choline-containing
“Nootropic” was coined to describe compounds improving learning and memory with low toxicity; in supplement marketing it now labels alm
“Adaptogen” describes plants claimed to help the body resist stress, a category term from mid-century research rather than a regulated
Branched chain amino acids share a transport system with tryptophan and tyrosine at the blood-brain barrier, so large intakes can in pr
Branched chain amino acids — leucine, isoleucine and valine — are studied mainly for muscle protein synthesis and exercise recovery, at
Ginsenosides are the compounds credited with ginseng's activity, and research extracts state a ginsenoside percentage — without it, a m
Panax ginseng has been studied for mental performance and fatigue at 200–400 mg daily of standardised extract, with reviews reporting i
A large share of L-theanine attention research uses it in combination with caffeine, where the pairing is associated with improved atte
“Clinically studied ingredient” usually means the ingredient was studied somewhere, at some dose, in some population — not that this pr
L-theanine is an amino acid from tea studied for calm, focused attention, at doses spanning roughly 100–400 mg, with 200 mg common in a
A fair comparison matches serving size, ingredient form, standardisation and amount — not just the ingredient names or the headline tot
Supplement Facts amounts are given per serving, and a serving is often two or more capsules — so per-capsule content is a fraction of t
Most well-known rhodiola trials used an extract standardised to roughly 3% rosavins and about 1% salidroside; a product standardised on
Rhodiola rosea is studied for mental fatigue and performance under stress, generally at 200–600 mg daily of a standardised extract.
The “other ingredients” line lists capsule material, fillers and flow agents — usually inert, occasionally relevant for allergies or di
Bacopa's activity is attributed to compounds called bacosides, and research extracts are standardised to a stated bacoside percentage —
The same botanical from different suppliers can vary in active content, contaminant levels and consistency, which is why standardisatio
Nutrients from food arrive with co-factors and in different chemical forms than isolated supplements, which sometimes changes how they
Bacopa monnieri is an Ayurvedic herb with randomised trials reporting modest improvements in memory acquisition and delayed recall, typ
Multi-ingredient formulas assume their components work together, but interactions between botanicals in a blend are almost never tested
Supplements often show clearer effects in people with a deficiency or impairment, and much smaller ones in healthy adults who have less
Positive results are more likely to be published than negative ones, which makes the visible literature on any ingredient look more fav
A statistically significant result can still be too small to notice; effect size describes how large the change actually was, and it is
Cell-culture experiments, animal models and human trials answer different questions, and results at one level do not establish outcomes
Some pages cite a database search results page rather than a specific study, which points at a body of literature without committing to
A useful citation check asks four questions: what dose, what population, what endpoint, and what form of the ingredient was used.
Testing a complete multi-ingredient formula in a randomised trial is expensive and commercially risky, which is why almost every supple
Whole powdered herb and a concentrated extract are different materials: the extract contains more of certain compounds per gram, but no
Standardisation guarantees a stated percentage of a named active compound in an extract, which is how research materials are defined an
A ratio such as 10:1 describes how much raw herb was concentrated into the extract; it does not tell you how much you are taking or how
Curcumin from turmeric is a genuine antioxidant with poor oral bioavailability, which is why research formulations pair it with piperin
Huperzine A is active at microgram doses and works by inhibiting an enzyme that breaks down acetylcholine, which makes both its potency
Ashwagandha is studied mainly for stress and anxiety measures at 300–600 mg daily of standardised root extract, with cognitive claims r
Creatine, best known in sports nutrition, has emerging research on cognition particularly under sleep deprivation or in vegetarians, at
Caffeine has the most consistent acute effects on alertness and attention of anything in this category, at doses of roughly 40–200 mg.
Phosphatidylserine is a phospholipid studied for memory in older adults, typically at 100–300 mg daily, and is one of the ingredients m