Age-related decline in memory, processing speed, and executive function. Ranges from normal aging to MCI to dementia.
Ayurvedic nootropic herb with 3,000+ years of traditional use. Modern RCTs confirm memory-enhancing effects, particularly for learning rate and memory consolidation. Requires sustained use.
Phospholipid making up significant portion of brain cell membranes. Supports memory, cognitive function, and cortisol regulation. FDA-qualified health claim for cognitive function.
Acetylated form of L-carnitine that crosses the blood-brain barrier. Supports mitochondrial energy production in neurons. Evidence for neuropathy, cognitive decline, and depression.
Plant-based source of DHA and EPA from microalgae — the same source fish get their omega-3s from. Suitable for vegetarians/vegans. Equivalent bioavailability to fish oil.
Most bioavailable choline source for the brain. Crosses blood-brain barrier efficiently. Used in Europe as a prescription drug for cognitive decline (Gliatilin). Supports acetylcholine synthesis.
Adaptogenic herb from Ayurvedic medicine. Reduces cortisol, supports sleep, and may improve metabolic markers. KSM-66 and Sensoril are the most-studied standardized extracts.
Combination of all eight B vitamins. Supports energy metabolism, nerve function, and methylation. Often used as a baseline supplement. Quality varies significantly between brands.
Naturally occurring brain compound that provides both choline and cytidine. Supports cell membrane synthesis and neurotransmitter production. Better studied for stroke recovery and cognitive function than most nootropics.
One of the most studied supplements in existence. Beyond muscle performance, emerging evidence for cognitive function — the brain uses creatine for energy-intensive tasks. May be especially beneficial for sleep-deprived cognition.
Active compound in turmeric with broad anti-inflammatory and antioxidant effects. Poor bioavailability requires enhanced formulations (piperine, phytosome, nanoparticle). One of the most researched natural compounds.
Essential fatty acids the body cannot produce. EPA and DHA support cardiovascular health, reduce triglycerides, and have anti-inflammatory effects. One of the most studied supplements in existence.
Essential B vitamin critical for DNA synthesis, methylation, and homocysteine metabolism. Methylfolate (5-MTHF) is the active form, preferred over folic acid especially for MTHFR variants.
The most-studied supplement specifically for tinnitus. Improves cochlear blood flow. Cochrane review found mixed evidence, but European trials show benefit with standardized EGb 761 extract. Widely prescribed in France and Germany.
Naturally-derived acetylcholinesterase inhibitor from Chinese club moss. Works like a mild version of Aricept (donepezil). Used in China as a drug for Alzheimer's disease.
Essential mineral for oxygen transport and energy production. Deficiency is common (especially in women) and causes fatigue, cognitive impairment, and hearing issues. Do NOT supplement without confirmed deficiency.
Amino acid derivative that shuttles fatty acids into mitochondria for energy production. Different forms have different targets: L-carnitine for heart/muscle, acetyl-L-carnitine for brain.
Medicinal mushroom that stimulates nerve growth factor (NGF) production. One of few natural compounds shown to promote neurogenesis. Growing evidence for cognitive function and nerve repair.
Expensive spice with surprisingly strong evidence for depression and emerging evidence for AMD. Crocin and safranal are the active compounds. Multiple well-designed RCTs.
Essential for nerve function, DNA synthesis, and red blood cell formation. B12 deficiency is associated with tinnitus, hearing loss, and cognitive decline. Methylcobalamin form preferred for neurological applications.
Fat-soluble vitamin functioning like a hormone, affecting 1,000+ genes. Widespread deficiency (40% of US adults). Critical for bone, immune, and cardiovascular health.
Key intermediate in the Krebs cycle. Animal studies showed significant lifespan extension. Rejuvant LifeAKG human trial suggested biological age reversal via DNA methylation clocks, but remains controversial.
Potent antioxidant that works in both water and fat-soluble environments. R-form is the biologically active isomer. Evidence for diabetic neuropathy and blood sugar support.
Short-chain fatty acid normally produced by gut bacteria fermenting fiber. Fuels colon cells, reduces inflammation, and supports gut barrier integrity. Supplemental forms bypass the need for microbial production.
Dipeptide found in muscle and brain. Acts as an intracellular buffer, antioxidant, and anti-glycation agent. Levels decline with age. May be supplemented directly or via beta-alanine.
Essential coenzyme in mitochondrial energy production. Levels decline with age and are depleted by statins. Ubiquinol is the active reduced form with better bioavailability.
Medicinal mushroom traditionally used in Chinese medicine. Modern cultivated Cordyceps militaris has replaced the rare wild Cordyceps sinensis. Supports energy, exercise performance, and kidney function.
Concentrated polyphenol from green tea. EGCG is the primary active catechin. Supports metabolic rate, fat oxidation, and has neuroprotective properties. Liver safety concerns at high doses.
Essential for thyroid hormone production. Deficiency affects cognitive development and metabolic rate. Most people in developed countries get adequate iodine from iodized salt.
Mixture of phospholipids including phosphatidylcholine, phosphatidylserine, and phosphatidylinositol. Common food additive also used as a supplement. Source of choline and phospholipids.
Precursor to glutathione, the body's master antioxidant. Originally a mucolytic drug, now used for liver protection (acetaminophen overdose antidote), respiratory health, and cochlear protection. One of the most versatile supplements.
Form of vitamin B3 that serves as NAD+ precursor. NAD+ levels decline with age. NR raises NAD+ effectively without niacin flushing. Whether NAD+ elevation translates to health benefits is the key question.
Another NAD+ precursor, popularized by David Sinclair. Debates NR vs NMN. Recent human trial from University of Washington showed improved muscle insulin sensitivity. Regulatory status has been uncertain.
Major phospholipid in cell membranes and a source of choline. Supports liver cell membrane integrity and bile function. Polyenylphosphatidylcholine (PPC) form is most studied for liver.
Rich source of punicalagins and ellagitannins. Gut bacteria convert these to urolithin A, which activates mitophagy. Evidence for cardiovascular and cognitive benefits.
Micronutrient that stimulates mitochondrial biogenesis — the creation of new mitochondria. Found in small amounts in foods. Relatively new supplement with growing but still limited evidence base.
Live beneficial bacteria. Effects are highly strain-specific — different strains do different things. Gut microbiome influences virtually every organ system. Quality and strain selection matter enormously.
Flavonoid found in onions, apples, and berries with anti-inflammatory and senolytic properties. When combined with dasatinib, selectively clears senescent cells. Phytosome form improves poor bioavailability.
One of the most revered medicinal mushrooms in Asian medicine. Contains triterpenes and polysaccharides. Traditionally used for calming, liver support, and immune modulation.
Polyphenol found in red wine, grape skins, and Japanese knotweed. Activates SIRT1 and AMPK pathways. Dramatic longevity effects in animal models have not clearly translated to humans.
Universal methyl donor involved in 200+ metabolic reactions. Prescription drug in Europe for depression and liver disease. Supports methylation, cartilage repair, and liver function.
Adaptogenic berry used in Traditional Chinese Medicine for 2,000+ years. Name means 'five-flavor berry.' Contains lignans (schisandrins) with hepatoprotective and cognitive-enhancing properties.
Essential trace mineral with antioxidant properties. Necessary for thyroid function and glutathione production. Excess can be toxic — narrow therapeutic window.
Most potent natural activator of Nrf2 pathway — the body's master antioxidant defense system. Derived from broccoli sprouts. Upregulates hundreds of protective genes.
Essential for energy metabolism and nerve function. Deficiency causes Wernicke-Korsakoff syndrome. Benfotiamine is a fat-soluble form with better tissue penetration.
Active form (P5P) is involved in neurotransmitter synthesis and over 100 enzyme reactions. Deficiency affects nerve function. High doses of pyridoxine (not P5P) can cause neuropathy.
There are other evidence-based interventions studied for cognitive decline: