Topic
Side-effect and interaction breakdowns drawn from published human research, plus who should check with a clinician before combining or starting anything.
Want the evidence grades side by side? Try the Evidence Explorer.
12 articles
One of the most-asked lion's mane questions online has almost no direct research behind it. What the small human trials touched on mood, why there are no SSRI-interaction studies, and how to think about combining them.
Read the articleBacopa carries a thyroid caution on most labels. It rests on animal data, not human interaction trials — but with narrow-margin drugs like levothyroxine, the conservative call is still to check first. Here's the honest state of the evidence.
Read the articleHow supplements actually interact with medications — the three mechanisms in plain English, the interactions worth knowing by name, why they can distort your lab results, and why "no known interactions" is not the same as safe.
Read the articleWhat human research reports about melatonin's side effects, how modest its real sleep effect is, who should be cautious, and why a smaller dose is usually the smarter one.
Read the articleHuperzine A works like a drug — it strongly blocks the enzyme that breaks down acetylcholine — and its side-effect profile reflects that. What human research reports, why microgram dosing matters, and who should avoid it.
Read the articleAlpha-GPC's day-to-day tolerability is generally mild, but a large 2021 observational study flagged an association with higher stroke risk — an honest look at what that finding does and does not show.
Read the articleWhat the research behind magnesium L-threonate (Magtein) actually reports about tolerability, the elemental-magnesium labeling issue that makes doses hard to compare, and who should check with a clinician first.
Read the articleWhat human research reports about Ginkgo biloba's tolerability, the bleeding-risk interaction that matters most, and where the enhancement evidence honestly stands.
Read the articleWhat published human trials report about ashwagandha's tolerability, the international liver-safety signal, who should check with a clinician first, and where the evidence is still thin.
Read the articleWhether Lion's Mane and L-theanine can be taken together, what each one is studied to do, what the combination is (and isn't) known to do, and the cautions worth knowing.
Read the articleWhat human studies report about Lion's Mane mushroom tolerability, the known cautions and allergy considerations, and where the evidence is still thin.
Read the articleWhat human studies report about L-theanine's side effects and tolerability, where the evidence is thin, and who should talk to a clinician before trying it.
Read the articleIngredients covered
Full evidence-graded profiles for the ingredients discussed across these articles.
An edible mushroom studied for long-term cognitive support. Human evidence is still limited, so it is positioned as an emerging ingredient with sourcing and extract-quality considerations.
Read the full breakdown
A traditional herb standardized for compounds called bacosides. It is studied mainly for memory and learning over sustained daily use, not for same-day effects.
Read the full breakdown
A well-characterized stimulant-free botanical with a dedicated Health Canada monograph that allows a cognition/memory claim. Its best human evidence is in older adults with cognitive symptoms; in healthy adults the benefit is small and inconsistent.
Read the full breakdown
A fat-soluble vitamin that activates the proteins directing calcium into bone rather than soft tissue. It is a foundational cofactor for vitamin D, not a cognitive ingredient, and it carries one significant caution: it directly interacts with warfarin and other vitamin K antagonists.
Read the full breakdownA plant-derived compound that strongly and selectively blocks the enzyme that breaks down acetylcholine — the same mechanism as some prescription memory drugs. That drug-like potency, thin healthy-adult evidence, and cholinergic side-effect profile make it a serious ingredient to handle carefully, not a casual add.
Read the full breakdown
A calming adaptogen with solid human evidence for reducing stress, anxiety, and cortisol at 300–600 mg/day of standardized extract. Any cognitive benefit is mostly downstream of stress relief and is still emerging in healthy adults.
Read the full breakdownOther topics
What the category actually is, how to evaluate it, and where the evidence stands.
Plain-English breakdowns of individual nutrients and compounds, dose, and form.
How to read a label, spot proprietary blends, and judge sourcing and testing.
Neutral comparisons of forms, doses, and formats to help practical decisions.
Start from what you're trying to support — focus, stress, sleep, brain fog — and see the graded ingredients.