Nootropic Ingredients Explained: Bacopa, Ginkgo, Ginseng, L-Theanine and Caffeine

July 29, 2026|Barry Lees

Brain formulas have the longest ingredient lists in the supplement aisle. This is a walk through the ones you will actually meet — what each is, what part of the plant it comes from, what dose is typical, and what to watch for.

I sell a formula containing most of them, so weigh that. I have tried to write the version I would want to read before buying, which means the interactions and the awkward numbers are in here too.

A note on how doses are written

Botanical amounts on a label are usually equivalent weights from a concentrated extract, not the weight of powder in the capsule. "1000mg Korean panax ginseng" typically means an extract equivalent to 1000mg of the raw root. This is a normal and legitimate convention, but it only lets you compare two products if both state it. Where a label gives you a big number and no explanation, you cannot tell which convention it is using.

The botanicals

Bacopa monnieri

A creeping marsh herb used in Ayurvedic practice, also sold as brahmi. The compounds of interest are bacosides, and good extracts state the bacoside percentage as well as the weight. Typical supplement doses run from 150mg to 600mg equivalent; ours is 300mg.

Bacopa is the ingredient most associated with the "give it eight to twelve weeks" advice you see in this category. Some people report digestive upset taking it on an empty stomach, which is why most brain formulas suggest taking them with or near food.

Claim status: none. Bacopa's claims sit in the on-hold category and are not authorised in GB.

Ginkgo biloba

Leaf extract from a tree species that has been around, essentially unchanged, for a very long time. It is the single most common botanical in UK pharmacy brain products — it is in Vitabiotics Neuromind, in Boots Sharp Mind, and it is sold on its own as a 120mg one-a-day tablet in most pharmacies. Quality extracts are typically standardised to 24% flavone glycosides and 6% terpene lactones, often written as "24/6". Ours is 300mg leaf equivalent.

The interaction to know: ginkgo has a recognised interaction with blood-thinning medication, and it is one of the botanicals you should stop taking before surgery. Vitabiotics carries the anticoagulant warning on its own product and so do we. If you take warfarin, clopidogrel, apixaban or similar, speak to your GP or pharmacist before buying any ginkgo product from anyone.

Claim status: none authorised. Ginkgo's memory-related claims are among the on-hold set.

Korean panax ginseng

The root of Panax ginseng, distinct from American ginseng and from Siberian ginseng (which is a different plant entirely — Eleutherococcus). The compounds of interest are ginsenosides. It is usually the largest botanical by weight in a brain formula; ours is 1000mg equivalent.

Cautions: panax ginseng interacts with blood-thinning and blood-glucose medication, and is not recommended in pregnancy or breastfeeding. Like ginkgo, stop before surgery.

Claim status: none authorised.

Green tea and guarana

Both appear constantly in this category and both are worth reading as caffeine sources first. Guarana seed is roughly twice the caffeine of coffee bean by weight. A formula can therefore be considerably more stimulating than its declared caffeine figure suggests — or contain meaningful caffeine while declaring none at all, if the only sources are botanical. If you are caffeine-sensitive, read the ingredients list rather than the front of the pot.

Turmeric, rosemary and cinnamon

The supporting cast. With turmeric, the number to look for is the curcuminoid content rather than the turmeric weight — raw turmeric root is only a few percent curcuminoids, so "212mg turmeric root providing 10mg curcuminoids" tells you far more than "212mg turmeric". Black pepper is almost always present alongside it. None of the three carries an authorised claim.

The amino acids and lipids

L-theanine

An amino acid found naturally in tea leaves, and the reason tea and coffee feel different despite both containing caffeine. It is very commonly paired with caffeine in this category, usually at somewhere between 100mg and 200mg. Ours is 100mg.

Claim status: none authorised.

L-tyrosine

An amino acid that the body uses as a precursor in making certain neurotransmitters. Typically 100mg to 500mg in a blend; ours is 100mg. Worth knowing: tyrosine has a recognised interaction with thyroid medication.

N-acetyl L-carnitine

An acetylated form of L-carnitine, chosen over plain carnitine in brain formulas for its different absorption profile. Usually 100mg to 500mg; ours is 100mg. No authorised claim.

Phosphatidylserine and phosphatidylcholine

Phospholipids, structurally part of cell membranes. The thing to know as a shopper is practical rather than biochemical: both are usually derived from soya, and they are the single most common reason a brain supplement carries a soya allergen declaration. Neuromind, Efamol Active Memory and our own formula all declare soya for this reason.

Choline

Choline does have authorised claims — for normal liver function, lipid metabolism and homocysteine metabolism — but they need 82.5mg per serving to reach the 15% threshold. Most brain formulas carry far less than that, ours included at 37mg. Where a label lists choline in single or double digit milligrams, nothing may be claimed for it, and you should be sceptical of a page that talks it up.

DHA

The omega-3 with a real, authorised brain claim — and a condition attached. DHA contributes to the maintenance of normal brain function at 250mg of DHA per day, DHA on its own, not combined with EPA. Most brain formulas that mention DHA are nowhere near it. Efamol Active Memory reaches it at 250mg per capsule, from fish oil in a bovine gelatin capsule. Ours is 50mg and we do not attach the claim to it.

The distinction worth knowing when comparing: DHA is either fish-derived or algae-derived. Algal DHA, usually from Schizochytrium, is the only route to a vegan DHA supplement — fish get theirs from eating algae in the first place, so it is the original source rather than a substitute.

Caffeine, on its own terms

The most effective ingredient in the category and the one with the least to say for itself, legally.

EFSA issued positive opinions on caffeine for alertness and concentration, and then the European Parliament vetoed the regulation that would have authorised them. They were never adopted, and that carried into GB law. No UK supplement may claim its caffeine improves focus or alertness. Anyone telling you otherwise, or citing "EFSA-approved", has not checked.

What you can do is count it. Health authorities generally treat 400mg a day as the ceiling for healthy adults, and 200mg for pregnancy — though caffeine-containing supplements are generally not recommended in pregnancy at all. When you total yours, count the supplement, the coffee, the tea, and the guarana and green tea inside the supplement.

Our own formula declares 100mg per serving, with guarana and green tea on top of that. At the maximum six capsules a day it would be 300mg of declared caffeine before the botanicals are counted, which is why we print the ceiling on the label.

The six that can actually claim something

After all of the above, the legally-supported part of a brain supplement comes down to vitamins and minerals:

Zinc — contributes to normal cognitive function
Iodine — contributes to normal cognitive function and to the normal functioning of the nervous system
Pantothenic acid (B5) — contributes to normal mental performance
Vitamin B12 — normal psychological function, normal nervous system function, reduction of tiredness and fatigue
Folate — normal psychological function, reduction of tiredness and fatigue
Niacin (B3) — normal psychological function, normal nervous system function, reduction of tiredness and fatigue

Each needs to be at 15% NRV or above per serving to carry its claim. This is the structure the biggest UK brain brands are built on, and it is the structure ours is built on: Nootro Brain carries all six, alongside the eighteen other ingredients described above, each printed at its own weight.

One caution to carry away from this whole page: if you take blood-thinning or blood-glucose medication, thyroid medication, or you are pregnant or breastfeeding, this is a category to discuss with your GP or pharmacist rather than to browse. Ginkgo, panax ginseng, tyrosine and caffeine all have reasons to be checked.