Safety & Interactions
How supplements can interact with medications and each other, and when to talk to a clinician before combining anything.
Natural does not mean interaction-free. Some supplements can affect how medications work, and stacking several products can add up in ways you did not intend.
See every article in this topic on the Safety & Interactions hub, or filter ingredient evidence directly in the Evidence Explorer.
An adaptogenic herb standardized for rosavins and salidroside. Its studied benefit is narrow: reducing stress-related mental fatigue and helping sustain output during genuinely demanding stretches (night shifts, exam load) — not lifting baseline performance in a rested, unstressed adult.
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A phospholipid that is part of cell membranes, including in the brain. Its most persuasive memory trials used a bovine-cortex source in memory-impaired older adults; modern soy- and sunflower-derived PS — what this and every current supplement actually contains — has not cleared that same bar.
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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 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.
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A well-tolerated botanical with strong human evidence for mood and stress and secondary sleep benefits, standardized as branded extracts. Its role in a cognitive stack is as a mood- and stress-resilience component, not a proven direct cognition enhancer.
Read the full breakdownA small choline-related molecule marketed on the theory that it raises acetylcholine. That mechanism is poorly confirmed, healthy-adult cognition evidence is weak and dated, and animal studies show developmental-toxicity signals — so for a conservative, review-ready brand it is best understood as a flagged ingredient rather than a candidate.
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