Duration Guide
Duration determines how to evaluate a nootropic. Acute compounds are judged by same-day performance and rebound; medium-term compounds need a trial window; long-term compounds require caution because durable change can be good or bad.
Duration pages
Dynamic duration table
| File | duration | onset | half_life | primary_effects |
|---|---|---|---|---|
| 5-HTP | Acute & Instant Effects | 30-120 minutes for acute effects; mood effects may take days to weeks | Roughly 2-4 hours, with downstream serotonin/melatonin effects | mood support, sleep support, appetite modulation, serotonin precursor |
| ACD-856 | Acute & Instant Effects | Unknown; estimated 30-90 minutes based on similar compounds | Unknown; preclinical data only | memory enhancement, hippocampal LTP support, learning, cognitive sharpening |
| Acetyl-L-Carnitine | Acute & Instant Effects | 1-3 hours acutely; weeks for fatigue or neuropathy-related outcomes | Several hours; tissue carnitine pools vary | mental energy, mitochondrial support, fatty acid transport, neuropathy support |
| Adderall | Acute & Instant Effects | IR: about 30-60 minutes; XR: 1-2 hours with extended profile | Amphetamine isomers often about 9-14 hours, affected by urine pH and individual factors | ADHD symptom control, wakefulness, motivation, executive function under clinical need |
| Agmatine Sulfate | Acute & Instant Effects | 30-120 minutes | Human nootropic kinetics are not well established; effects are usually same-day | mood support, pain modulation, glutamate modulation, vascular modulation |
| Alpha-GPC | Acute & Instant Effects | 30-120 minutes | Choline kinetics vary; acute effects usually last several hours | acetylcholine support, focus, memory support, power output support |
| Amphetamines | Acute & Instant Effects | Varies by compound and route; prescription oral forms often 30-90 minutes | Varies; dextroamphetamine often around 10-13 hours, methamphetamine often longer | wakefulness, attention, motivation, appetite suppression |
| Aniracetam | Acute & Instant Effects | 20-45 minutes | 1-3 hours (short; active metabolites may extend effects) | memory support, anxiety reduction, mood lift, creativity, verbal fluency |
| Armodafinil | Acute & Instant Effects | 30-120 minutes | Approximately 12-15 hours, often subjectively long | wakefulness, vigilance, fatigue reduction, executive function under sleepiness |
| BPN-14770 | Acute & Instant Effects | Unknown; estimated 1-3 hours based on mechanism | Unknown; preclinical pharmacokinetic data only | memory enhancement, CREB activation, BDNF upregulation, learning support |
| Caffeine | Acute & Instant Effects | 15-60 minutes; faster in gum or liquid, slower with food | Usually about 3-7 hours in adults, highly variable with genetics, pregnancy, liver function, smoking, and medications | wakefulness, vigilance, reaction time, reduced perceived effort |
| CBD | Acute & Instant Effects | 30-90 minutes (oral); faster sublingual or inhaled | 18-32 hours with regular use; 1-2 hours for initial single dose | anxiety reduction, sleep support, anti-inflammatory, mood stabilization, pain modulation |
| Chai | Acute & Instant Effects | 15-60 minutes depending on caffeine dose, milk/food, and brew strength | Caffeine half-life is commonly 3-7 hours, longer in slow metabolizers or pregnancy | warm stimulation, mood lift, digestion support, calm focus |
| Citicoline | Acute & Instant Effects | 1-3 hours for acute subjective effects; weeks for membrane-related support | Metabolized into choline and cytidine/uridine pools; practical effects vary over hours to days | attention, acetylcholine support, membrane repair, mental energy |
| Coluracetam | Acute & Instant Effects | 30-60 minutes | ~3 hours | memory support, choline uptake enhancement, mood support, visual sharpness |
| DMAE | Acute & Instant Effects | 30-120 minutes in user reports; cumulative claims are uncertain | Not well characterized for nootropic use | focus claims, cholinergic tone, mental clarity, skin/anti-aging marketing |
| Electrolytes | Acute & Instant Effects | Minutes to hours when imbalance or sweat loss is present | Varies by electrolyte and kidney regulation; acute balance shifts over hours | hydration, nerve conduction, muscle function, blood pressure stability, exercise performance |
| Epicatechin | Acute & Instant Effects | 1-3 hours for vascular effects; weeks for training adaptations | Short parent compound kinetics; metabolites act over hours | blood flow, endothelial function, exercise support, antioxidant signaling |
| Forskolin | Acute & Instant Effects | 30–90 minutes for acute cAMP elevation; cognitive effects may require consistent use | Approximately 4–6 hours | memory enhancement, cognitive processing, cAMP elevation, motivation, focus |
| GABA | Acute & Instant Effects | 30-60 minutes if subjectively active | Short; central penetration is limited and debated | calming, sleep support, stress reduction |
| Glycine | Acute & Instant Effects | 30-90 minutes for sleep temperature and calming effects | Short amino acid kinetics over hours | sleep quality, calming, body temperature regulation, collagen support |
| Guarana | Acute & Instant Effects | 30-90 minutes | Driven mainly by caffeine: often 3-7 hours, variable | wakefulness, energy, reaction time, fatigue reduction |
| Huperzine A | Acute & Instant Effects | 30-90 minutes | Often reported around 10-14 hours, with long subjective cholinergic duration | acetylcholine preservation, memory support, lucidity, focus |
| Kava | Acute & Instant Effects | 30–60 minutes for onset; peak effects 1–2 hours | Kavalactone half-life approximately 9 hours; subjective effects last 3–5 hours | anxiety reduction, social ease, muscle relaxation, mild euphoria, sleep support |
| Kratom | Acute & Instant Effects | 15-60 minutes orally | Mitragynine estimates vary widely, often several to many hours | pain relief, stimulation at low exposure, sedation at higher exposure, mood alteration |
| L-Citrulline | Acute & Instant Effects | 30-120 minutes for blood-flow effects | Raises arginine over hours; nootropic duration is same-day | blood flow, exercise performance, nitric oxide support, reduced fatigue |
| L-Theanine | Acute & Instant Effects | 30-60 minutes | Roughly 1-3 hours; subjective calming may last several hours | calm focus, reduced caffeine jitter, stress resilience, alpha-wave support |
| L-Tyrosine | Acute & Instant Effects | 30-120 minutes | Amino acid kinetics over hours; stress-buffering effects are acute | stress cognition, working memory under pressure, dopamine precursor support, fatigue resistance |
| Lemon Balm | Acute & Instant Effects | 30-120 minutes for acute calming; days to weeks for stress patterns | Not well established; rosmarinic acid and terpenes have different kinetics | anxiety reduction, calm focus, sleep support, mood support |
| Marijuana | Acute & Instant Effects | Inhaled: minutes; oral: 30-120 minutes | THC redistribution is complex; acute effects last hours, metabolites can persist days to weeks | relaxation, pain modulation, appetite, altered perception, sleepiness |
| Matcha | Acute & Instant Effects | 15-60 minutes for caffeine/theanine; chronic polyphenol effects are weeks-scale | Caffeine half-life is commonly 3-7 hours; catechin kinetics vary | calm focus, wakefulness, mood support, antioxidant support |
| Melatonin | Acute & Instant Effects | 30-120 minutes depending on timing and formulation | Usually about 20-60 minutes for immediate-release; prolonged-release lasts longer | circadian phase shifting, sleep onset support, jet lag support, antioxidant signaling |
| Methylene Blue | Acute & Instant Effects | 30-120 minutes in anecdotal low-dose use; medical effects depend on route and indication | Roughly 5-24 hours depending on dose, route, and measurement method | mitochondrial support, mental energy, redox cycling, neuroprotection research |
| Modafinil | Acute & Instant Effects | 30-120 minutes | Approximately 12-15 hours | wakefulness, vigilance, fatigue reduction, executive function under sleepiness |
| Mucuna Pruriens | Acute & Instant Effects | 30-120 minutes | L-DOPA plasma half-life is short, often around 1-2 hours without carbidopa | dopamine precursor, motivation, mood, motor activation |
| Neboglamine | Acute & Instant Effects | Unknown; estimated 30-90 minutes based on mechanism | Unknown; no published human PK data | NMDA receptor modulation, memory support, cognitive function in impairment |
| Nefiracetam | Acute & Instant Effects | 30-60 minutes | 3-5 hours | memory support, neuroprotection, mood support, learning |
| Nicotine | Acute & Instant Effects | Seconds by inhalation; minutes by gum/lozenge; slower and steadier by patch | About 1-2 hours; cotinine persists much longer | attention, working memory, alertness, reward reinforcement |
| Nitrates | Acute & Instant Effects | 2-3 hours for peak nitrate-nitrite-nitric oxide conversion | Nitrate/nitrite effects last several hours | blood flow, exercise efficiency, blood pressure support, endothelial function |
| Noopept | Acute & Instant Effects | 30-90 minutes acutely; neurotrophic claims would require repeated use | Parent compound is short-lived; active metabolite and downstream effects may last longer | memory support, focus, neurotrophic signaling, verbal fluency |
| Oleamide | Acute & Instant Effects | 30-90 minutes | ~2-4 hours (degraded by FAAH) | sleep induction, sleep quality, GABAergic calming, mood modulation |
| Oxiracetam | Acute & Instant Effects | 30-60 minutes | 8-10 hours | focus, logical thinking, memory, mental energy, sensory sharpness |
| Oxytocin | Acute & Instant Effects | Minutes to an hour depending on route; context strongly shapes effects | Plasma half-life is only minutes; central and behavioral effects can last longer | social salience, bonding, trust/context effects, stress modulation |
| Passionflower | Acute & Instant Effects | 30-120 minutes for calming; days to weeks for anxiety patterns | Not well established; flavonoids and alkaloids vary by extract | anxiety reduction, sleep support, calming, withdrawal-support research |
| Phenibut | Acute & Instant Effects | 2-4 hours orally; slow onset encourages accidental redosing | Often cited around 5 hours, but subjective effects and rebound can last much longer | anxiety reduction, sociability, sleep support, euphoria |
| Phenylpiracetam | Acute & Instant Effects | 30-60 minutes | 3-5 hours | physical energy, focus, motivation, cold tolerance, mental drive |
| Piracetam | Acute & Instant Effects | 30-90 minutes | 4-5 hours | memory support, verbal fluency, focus, mental clarity |
| Pramiracetam | Acute & Instant Effects | 30-60 minutes | 5-6 hours | memory, learning efficiency, focus, information retention |
| Racetams | Acute & Instant Effects | 30-120 minutes for acute racetams; days to weeks for some cumulative effects | Varies widely: piracetam about 4-5 hours; phenylpiracetam shorter; aniracetam very short parent half-life | memory support, learning, focus, sensory clarity |
| Rhodiola Rosea | Acute & Instant Effects | 30-120 minutes for acute fatigue; days to weeks for stress resilience | Active constituent kinetics vary; subjective effects usually same-day | fatigue resistance, stress resilience, mood support, mental stamina |
| Ritalin | Acute & Instant Effects | IR: about 20-60 minutes; ER forms vary | IR methylphenidate about 2-3 hours; ER duration depends on formulation | ADHD symptom control, attention, impulse control, wakefulness |
| Selank | Acute & Instant Effects | 15-60 minutes in intranasal reports; stress effects may build | Short peptide half-life; subjective effects may last hours | anxiety reduction, calm focus, stress resilience, mood support |
| Semax | Acute & Instant Effects | 15-60 minutes intranasally in user reports; clinical effects may build | Short peptide half-life; subjective effects can last hours | focus, neurotrophic support, fatigue resistance, mood support |
| Sugar | Acute & Instant Effects | Minutes to hours depending on carbohydrate type and meal context | Blood glucose changes over minutes to hours; glycogen stores turn over across hours to days | acute energy, exercise support, mood stability when low, cognitive support during hypoglycemia |
| Taurine | Acute & Instant Effects | 30-120 minutes | Several hours; tissue pools are regulated | calm energy, osmoregulation, cardiovascular support, GABA/glycine modulation |
| Theacrine | Acute & Instant Effects | 45–75 minutes | Approximately 14–40 hours depending on dose and individual metabolism | wakefulness, energy, mood elevation, motivation, reduced fatigue |
| Theobromine | Acute & Instant Effects | 30-120 minutes | Often around 6-10 hours, variable | mild stimulation, mood support, vasodilation, smooth energy |
| Tropisetron | Acute & Instant Effects | 30-60 minutes | 6-8 hours | cognitive support in impairment, cholinergic modulation, nausea prevention, attention support |
| Valerian Root | Acute & Instant Effects | 30-120 minutes for sedation; sleep-quality trials often use repeated dosing | Not well established; valerenic acids and volatile compounds vary by extract | sleep support, anxiety reduction, sedation, sleep onset |
| Vinpocetine | Acute & Instant Effects | 30–90 minutes for cerebrovascular effects; cognitive benefits over weeks of use | Approximately 2-3 hours; requires 2-3x daily dosing for sustained levels | cerebral blood flow enhancement, memory support, neuroprotection, cognitive processing speed, anti-inflammatory |
| Water | Acute & Instant Effects | Minutes to hours when dehydration is present | Not applicable; hydration status changes with intake, sweat, urine, salt intake, and temperature | attention, headache reduction, thermoregulation, blood volume, physical performance |
| 9-Me-Bc | Long Term & Permanent Effects | Unknown; anecdotal reports vary | Not established for human nootropic use | dopamine neuron research, motivation claims, neuroprotection research |
| BPC-157 | Long Term & Permanent Effects | Unclear in humans; tissue effects would be days to weeks | Not well established in humans | tissue repair research, gut barrier support claims, anti-inflammatory signaling, injury recovery claims |
| Cerebrolysin | Long Term & Permanent Effects | Days to weeks in clinical protocols | Mixture kinetics are complex; biological effects may outlast plasma exposure | neurorecovery, neurotrophic support, stroke/TBI research, cognitive impairment support |
| Cortexin | Long Term & Permanent Effects | Days to weeks in clinical use | Mixture kinetics are not well established publicly | neuroprotection, neurorecovery, cognitive impairment support |
| Curcumin | Long Term & Permanent Effects | Weeks to months for cognitive and anti-inflammatory effects; bioavailability critically depends on formulation | Short for native curcumin (~1-2 hours); enhanced formulations vary significantly | anti-inflammatory, antioxidant, mood support, memory support, BDNF upregulation |
| Diet | Long Term & Permanent Effects | Meals affect energy within minutes to hours; body-composition and micronutrient changes build over weeks to months | Not applicable; effects depend on meal timing, glycogen, micronutrient stores, microbiome, and metabolic health | stable energy, neurotransmitter precursors, metabolic health, inflammation control, micronutrient sufficiency |
| Dihexa | Long Term & Permanent Effects | Unknown in humans | Not well established for human nootropic use | synaptogenesis research, neurotrophic signaling, memory research |
| Epithalon | Long Term & Permanent Effects | Unknown for nootropic use; proposed effects are long-term | Short peptide kinetics; downstream effects are speculative | circadian/aging research, telomerase claims, sleep rhythm claims |
| Exercise | Long Term & Permanent Effects | Acute mood and blood-flow effects within minutes to hours; structural adaptations over weeks to months | Acute neurotransmitter and glucose effects last hours; fitness and neuroplastic adaptations persist with training | executive function, mood, BDNF signaling, insulin sensitivity, vascular health |
| LSD | Long Term & Permanent Effects | Usually 30-90 minutes orally | Roughly 3-5 hours, with subjective effects often 8-12 hours | altered perception, cognitive flexibility, emotional salience, mystical-type experiences |
| NSI-189 | Long Term & Permanent Effects | Weeks in mood/neurogenesis research contexts | Reported human pharmacokinetics vary by formulation; not standardized for nootropic use | mood research, hippocampal neurogenesis research, cognitive support claims |
| PE-22-28 | Long Term & Permanent Effects | Preclinical rapid-onset antidepressant effects over days; human onset unknown | Human pharmacokinetics not established; designed for improved stability versus spadin | mood research, neurogenesis research, stress resilience research, neuroplasticity |
| Pinealon | Long Term & Permanent Effects | Unknown for nootropic use; proposed effects are cumulative | Short peptide kinetics; downstream effects not well characterized | neuroprotection claims, aging research, cognitive support claims |
| Psilocybin | Long Term & Permanent Effects | Usually 20-60 minutes orally depending on preparation and stomach contents | Psilocin half-life is roughly 2-3 hours; subjective effects often 4-6 hours | altered perception, emotional processing, cognitive flexibility, mystical-type experiences |
| Sleep | Long Term & Permanent Effects | Same night for acute sleep pressure; 1-3 weeks for circadian stabilization | Not applicable; effects follow sleep architecture, circadian phase, and accumulated sleep debt | memory consolidation, attention, mood stability, glymphatic clearance, hormonal regulation |
| Testosterone & Anabolics | Long Term & Permanent Effects | Weeks for mood/libido/body-composition changes; ester kinetics vary | Varies by ester: hours to days/weeks depending on formulation | libido, motivation, muscle mass, mood, red blood cell production |
| Ashwagandha | Medium Term & Saturation Effects | Days to weeks for stress and sleep effects; some calming may be same-day | Withanolide kinetics vary; practical effects are cumulative | stress reduction, sleep support, anxiety reduction, cortisol modulation |
| B-Vitamins | Medium Term & Saturation Effects | Hours to weeks depending on deficiency and vitamin | Varies: many are water-soluble with short plasma persistence; B12 stores can last years | energy metabolism, methylation, neurotransmitter synthesis, myelin support |
| Bacopa Monnieri | Medium Term & Saturation Effects | Usually 6-12 weeks for memory effects; acute effects may be calming or sedating | Bacoside pharmacokinetics are not well standardized; effects appear cumulative | memory consolidation, stress resilience, learning support, antioxidant support |
| Berberine | Medium Term & Saturation Effects | Metabolic effects in 2–4 weeks; gut microbiome changes begin within days | Short: approximately 2-4 hours; often dosed 3x daily for sustained levels | blood glucose regulation, metabolic health, gut microbiome support, mild antidepressant, cardiovascular support |
| Beta-Caryophyllene | Medium Term & Saturation Effects | 30-60 minutes | ~1-3 hours | anti-inflammatory, anxiety reduction, pain modulation, neuroprotection, mood support |
| Biotin (B7) | Medium Term & Saturation Effects | Weeks for deficiency correction; little acute nootropic effect when replete | Water-soluble; functional effects depend on carboxylase biotinylation and recycling | carboxylase support, fatty acid metabolism, glucose metabolism, deficiency correction |
| Bromantane | Medium Term & Saturation Effects | 1-3 hours; some effects may build over days | Not well characterized in public human data; subjective duration often same-day to longer | fatigue resistance, motivation, anxiolytic stimulation, dopamine synthesis support |
| Cat’s Claw | Medium Term & Saturation Effects | Days to weeks for inflammatory or immune effects | Not well established; depends on alkaloids, polyphenols, and extract type | anti-inflammatory support, immune modulation, joint comfort, neuroprotection research |
| Chaga | Medium Term & Saturation Effects | Days to weeks; acute cognitive effects are usually minimal | Not well established; polysaccharides, polyphenols, and triterpenes differ | antioxidant support, immune modulation, inflammation support, general resilience |
| Choline | Medium Term & Saturation Effects | Hours for acute intake; weeks for deficiency correction | Varies by form and tissue pool; no single practical half-life | acetylcholine synthesis, membrane support, methylation, liver fat metabolism |
| CoQ10 | Medium Term & Saturation Effects | Energy effects may be subtle over 2–4 weeks; antioxidant markers improve sooner | Approximately 33 hours for ubiquinol; tissue distribution means gradual accumulation with daily dosing | mitochondrial energy support, cardiovascular protection, antioxidant defense, fatigue reduction, statin side effect mitigation |
| Cordyceps | Medium Term & Saturation Effects | 1-3 hours for energy in some users; weeks for training or tonic effects | Not well established; cordycepin is rapidly metabolized and extracts vary | energy support, fatigue resistance, exercise support, adaptogenic support |
| Creatine | Medium Term & Saturation Effects | Days to weeks depending on loading; some acute fatigue benefits may occur sooner | Creatine pool turnover is roughly weeks; creatinine is cleared renally | ATP buffering, exercise performance, fatigue resistance, brain energy support |
| Folate & 5-Methylfolate | Medium Term & Saturation Effects | Days to weeks for mood/energy if low; blood markers shift over weeks | Varies by form; red blood cell folate reflects longer-term status | methylation, homocysteine regulation, mood support, DNA synthesis |
| Ginkgo Biloba | Medium Term & Saturation Effects | Weeks for cognitive/vascular effects | Ginkgolide/flavonoid kinetics vary; effects are cumulative | blood flow, memory support, antioxidant support, tinnitus/circulation research |
| Gotu Kola | Medium Term & Saturation Effects | 30–90 minutes for acute anxiolytic effect; 4–8 weeks for cognitive benefits | Poorly characterized; active constituents have variable clearance | anxiety reduction, memory support, blood flow enhancement, wound healing, neuroprotection |
| Inositol | Medium Term & Saturation Effects | Days to weeks for anxiety/metabolic effects | Several hours; tissue signaling effects are broader | anxiety support, insulin signaling, mood support, PCOS support |
| Lions Mane | Medium Term & Saturation Effects | Weeks to months for possible nerve-growth or cognitive effects | Not well established; effects depend on extract constituents and repeated use | neurotrophic support, memory support, mood support, nerve health |
| Lithium | Medium Term & Saturation Effects | Weeks for mood-stabilizing effects; trace-dose effects are subtle | Often about 18-36 hours in adults, longer in older adults or kidney impairment | mood stability, impulsivity reduction, neuroprotective signaling, circadian support |
| Magnesium | Medium Term & Saturation Effects | Hours to days for muscle relaxation or bowel effects; weeks for deficiency repletion | No simple plasma half-life; body stores and kidney regulation determine status | sleep quality, relaxation, muscle function, stress resilience, NMDA modulation |
| Magnesium L-Threonate | Medium Term & Saturation Effects | Sleep effects within days; memory and cognitive effects accumulate over 4–8 weeks | Magnesium distributes into tissues; brain Mg2+ elevation requires consistent multi-week use | memory enhancement, synaptic density improvement, sleep quality, anxiety reduction, cognitive aging protection |
| Maitake | Medium Term & Saturation Effects | Weeks for immune/metabolic effects; acute cognitive effects are subtle | No simple half-life; polysaccharide effects are immune and gut mediated | immune modulation, metabolic support, neuroprotection research, anti-inflammatory support |
| NAC & Glutathione | Medium Term & Saturation Effects | Hours for mucolytic/redox effects; weeks for compulsive or inflammatory outcomes | NAC plasma half-life is roughly several hours; glutathione turnover is dynamic | glutathione support, oxidative stress reduction, glutamate regulation, respiratory mucus support |
| NAD | Medium Term & Saturation Effects | Days to weeks for energy markers; acute effects vary by form and route | NAD+ turnover is dynamic; precursors have different kinetics | cellular energy, sirtuin substrate support, DNA repair support, metabolic resilience |
| Niacin (B3) | Medium Term & Saturation Effects | Minutes for flushing from nicotinic acid; days to weeks for NAD-related nutritional effects | Short for free niacin forms; NAD/NADP pools are regulated separately | NAD support, energy metabolism, redox support, skin and nervous system deficiency correction |
| Omega-3 Fish Oil | Medium Term & Saturation Effects | Weeks to months for membrane and inflammation changes | EPA and DHA incorporation and washout occur over weeks | membrane fluidity, inflammation resolution, mood support, cardiometabolic support |
| Panax Ginseng | Medium Term & Saturation Effects | 1-6 hours acutely; weeks for tonic effects | Ginsenoside kinetics vary widely by compound and microbiome conversion | mental energy, fatigue resistance, stress resilience, glucose support |
| Pantothenic Acid (B5) | Medium Term & Saturation Effects | Days to weeks; deficiency is rare but can affect fatigue and nerve symptoms | Water-soluble with regulated conversion into coenzyme A pools | CoA synthesis, acetylcholine support, fatty acid metabolism, energy metabolism |
| Phosphatidylcholine | Medium Term & Saturation Effects | Hours for digestion and choline availability; weeks for membrane and liver effects | No single useful half-life; enters phospholipid, choline, and bile pools | membrane support, choline support, liver lipid export, methylation support |
| Phosphatidylserine | Medium Term & Saturation Effects | Days to weeks; acute cortisol effects may be same-day in exercise contexts | Incorporates into phospholipid pools; no single useful half-life | memory support, stress response, membrane support, exercise recovery |
| PQQ | Medium Term & Saturation Effects | Days to weeks; acute effects are subtle | Human pharmacokinetics are not fully standardized; effects are downstream | mitochondrial biogenesis support, antioxidant signaling, fatigue support |
| Reishi | Medium Term & Saturation Effects | Hours for calming in some users; weeks for tonic immune/stress effects | Not well established; triterpenes and beta-glucans differ | calming, sleep support, immune modulation, stress resilience |
| Resveratrol | Medium Term & Saturation Effects | Days to weeks; acute effects are subtle | Parent resveratrol is short-lived, but metabolites persist longer | antioxidant signaling, vascular support, metabolic support, healthy aging pathways |
| Riboflavin (B2) | Medium Term & Saturation Effects | Days to weeks for deficiency; migraine protocols are evaluated over months | Short plasma persistence; converted into FMN and FAD coenzyme pools | mitochondrial redox support, migraine support, methylation support, antioxidant recycling |
| Saffron | Medium Term & Saturation Effects | 2–6 weeks for mood effects; some calming effects within hours | Safranal half-life approximately 1-2 hours; crocin longer-acting | mood support, anxiety reduction, antidepressant, PMS relief, appetite modulation |
| Shiitake | Medium Term & Saturation Effects | Weeks for immune/gut effects; food effects are meal-context dependent | No simple half-life; lentinan and beta-glucan effects are immune mediated | immune support, gut-brain support, anti-inflammatory support, food-based micronutrients |
| St. Johns Wort | Medium Term & Saturation Effects | 2–6 weeks for antidepressant effect; acute mild calming possible | Hypericin: approximately 24–26 hours. Hyperforin: shorter, approximately 9 hours | antidepressant, anxiety reduction, mood elevation, mild sedation, PMS support |
| Sulforaphane | Medium Term & Saturation Effects | Antioxidant gene expression within 24–48 hours; systemic anti-inflammatory effects over weeks | Approximately 2-3 hours; effects via gene expression last much longer | antioxidant defense, anti-inflammatory, neuroprotection, detoxification support, gut health |
| Thiamine (B1) | Medium Term & Saturation Effects | Days to weeks when deficient; acute energy changes are possible in severe depletion | Short plasma persistence; tissue-dependent coenzyme pools matter more | glucose metabolism, mental energy, nerve support, deficiency correction |
| Turkey Tail | Medium Term & Saturation Effects | Weeks for immune or gut-immune effects | No simple half-life; beta-glucan immune effects are receptor and microbiome mediated | immune modulation, gut-immune support, inflammation support, resilience |
| Uridine | Medium Term & Saturation Effects | Days to weeks for mood/membrane effects; acute effects are subtle | Uridine is rapidly regulated; triacetyluridine has different kinetics | membrane synthesis, mood support, dopamine receptor support, synaptic support |
| Vitamin B12 | Medium Term & Saturation Effects | Days to weeks for energy/mood if deficient; nerve recovery can take months | Large liver stores can last years; serum kinetics depend on form and route | myelin support, methylation, energy metabolism, homocysteine regulation |
| Vitamin B6 | Medium Term & Saturation Effects | Days to weeks for deficiency; acute effects vary with neurotransmitter precursor stacks | Varies by vitamer; functional PLP pools matter more than plasma half-life | neurotransmitter synthesis, GABA synthesis, serotonin and dopamine synthesis, homocysteine metabolism |
| Vitamin D | Medium Term & Saturation Effects | Weeks to months for serum repletion | 25-hydroxyvitamin D half-life is roughly 2-3 weeks | mood support, immune regulation, bone health, hormonal modulation |
| Zinc | Medium Term & Saturation Effects | Days to weeks depending on degree of deficiency and form used | Zinc distributes into tissues with a biological half-life of approximately 12.5 days; plasma zinc changes faster | cognitive function support, testosterone support, immune function, mood regulation, NMDA modulation |
Practical interpretation
Acute tools can be tested quickly but are prone to tolerance, dependence, rebound, and sleep disruption. Medium-term tools should be tracked for at least two to eight weeks unless side effects appear. Long-term tools deserve the most conservative thinking because they involve training adaptations, hormones, psychedelics, or neurotrophic pathways.