Plain-language guides to nootropic supplements — what each ingredient is, what to look for when buying it, and, where HighIQ Nootropics carries it, every product in that category.
Latest Guide · L-Theanine Dosage
What the trials actually gave: 50mg to 900mg, sorted by dose and goal. How much L-theanine per day is typical, what the highest tested dose was, what 800mg and 1,000mg mean, and how the dose changes with caffeine.
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Lion's Mane
A plain-language guide to the mushroom behind nearly every memory-and-focus supplement list — what the research actually looks at, fruiting body vs. mycelium, how much people take, how long it takes, and how to read a label.
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Bacopa Monnieri
Bacopa is one of the most-studied herbal nootropics and one of the slowest — here's what it is, how long it actually takes, the right dose, how to avoid the stomach upset, and how to read a bacoside percentage.
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Rhodiola Rosea
An adaptogenic root from cold, high-altitude terrain, reached for during stretches of stress and fatigue — what 'adaptogen' actually means, why the rosavin-to-salidroside ratio matters, how to time it, and how to avoid the wrong species.
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L-Theanine
L-Theanine is one of the simplest nootropics to use — how it works, the caffeine ratio people use, what the research does and doesn't show for stress and sleep, how long it takes, and why Suntheanine shows up on so many labels.
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Tongkat Ali
Tongkat Ali potency varies enormously between raw root and concentrated extract — what the research looks at, why the extraction ratio and eurycomanone content matter more than milligrams, how people cycle it, and what to watch for.
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Shilajit
Shilajit is mined, not grown, which makes purity the whole buying decision — what it is, what the research looks at, how to take resin, resin vs. capsules vs. powder, why home 'purity tests' don't prove much, and what to check before you buy.
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Ashwagandha
The best-known adaptogen in Ayurvedic medicine — what the research on stress and sleep actually looks at, root vs. leaf extracts, typical doses, why some people take breaks from it, and the safety issues that matter more than with most herbs.
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Maca
An Andean root vegetable best known for libido and energy — what the research actually looks at, why it probably doesn't raise testosterone, yellow vs. red vs. black maca, gelatinized vs. raw powder, and how much people take.
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L-Carnitine
A nutrient your body makes and gets from meat, sold in several forms for energy, exercise, and the brain — what it actually does, acetyl-L-carnitine vs. L-carnitine tartrate, typical doses, and the TMAO question.
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Fadogia Agrestis
A West African shrub that became popular as a testosterone booster almost overnight — why nearly all the research is in rats, what those studies found (including the worrying parts), how it's usually taken, and why bloodwork and caution matter.
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Creatine
Creatine is best known for muscle, but your brain runs on it too. What the trials found for memory, who seems to benefit most, how much people take, and the safety questions people actually ask: kidneys, hair loss and water weight.
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Bulletproof Coffee
Coffee blended with butter and MCT oil is sold as a focus-boosting, fat-burning breakfast. Nobody has tested the drink itself, so here's what the evidence says about each ingredient: caffeine, MCT oil, and butter.
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Phenibut
Phenibut is sold online as a nootropic for anxiety and sleep. It's actually a prescription drug in parts of Eastern Europe, it isn't a legal supplement ingredient in the US, and poison centers have seen serious harm. Here's what the data shows.
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Lion's Mane vs. Bacopa Monnieri
The two most popular long-term memory supplements work on different timelines, have different evidence behind them, and suit different people — a side-by-side comparison, plus whether it makes sense to take both.
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Tongkat Ali vs. Shilajit
Both are traditional men's-health tonics studied in relation to energy and testosterone, but one is a rainforest root and the other a mountain resin — how they compare on evidence, dosing, safety, and what to check before buying.
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Rhodiola Rosea vs. L-Theanine
Both get recommended for stress, but they work in opposite directions — Rhodiola for the drained, fatigued kind of stress and L-Theanine for the wired, tense kind. How to tell which you need, and how people combine them.
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L-Theanine + Caffeine
One of the simplest and most-studied nootropic stacks — what the trials actually tested, the ratios people use, how to dose it with coffee or tea, timing, tolerance, and who should skip it.
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Study Stack
A realistic, evidence-aware study stack built around timelines — what to start months before exams, what helps on the day, what to use when exam stress hits, and the basics no supplement can replace.
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Ashwagandha for Stress
Stress is the main reason people buy ashwagandha. Here's what the placebo-controlled trials actually measured, the doses and extracts they used, how long it took, and where the evidence runs out.
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Choosing Ashwagandha
The best ashwagandha supplement is the one that matches what was studied. How to read the label, capsules vs. powder vs. gummies, and four ashwagandha products compared side by side.
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Choosing Herbal Supplements
'Organic' and 'natural' on an herbal supplement label say less than most people think. What those words cover, why a study found toxic metals in a fifth of Ayurvedic products bought online, and how to choose one that's actually been tested.
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Nootropics Guide
A plain-English guide to nootropics: what the word covers, which popular supplements have human evidence for focus and memory, the safety basics, and how to pick a product that matches the research.
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MCT Oil Coffee
A practical guide to MCT oil coffee: how much MCT oil and ghee or butter to use, why blending matters, how ghee and butter actually compare per spoon, and which MCT oil does what.
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Ashwagandha for Women
Most ashwagandha research mixes men and women. A handful of trials studied women specifically, for menopause symptoms, sexual function and sleep. Here's what they found, how strong it is, and who should avoid ashwagandha.
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Alpha Brain Review
Onnit's Alpha Brain is one of the best-known nootropic brands. We read the current label, compared each ingredient with the doses used in research, and looked at the one published trial of the product itself.
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Tongkat Ali Dosage
Every human trial of Tongkat Ali we could find, sorted by dose: what 100mg, 200mg, 300mg, 400mg and 600mg a day actually did, how to match a label to those doses, when to take it, and why more isn't better.
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Cycling Tongkat Ali
Five days on, two off? Four weeks on, one off? The cycling schedules are everywhere, but no trial has tested one. Here's what the research does show about tolerance and hormones, and a sensible way to take breaks anyway.
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When to Take Rhodiola
Rhodiola trials gave it before breakfast and lunch, at the start of a shift, or an hour before exercise. Here's what each timing was used for, how fast it works, and whether taking it at night is a problem.
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Is Ashwagandha Safe?
A 2026 review of 23 trials found no serious adverse events in healthy adults at 125–600mg a day. But there are real case reports of liver injury and thyroid overactivity. Here's what each study found, what isn't known, and who should check with a doctor first.
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Ashwagandha for Men
Testosterone, libido, erections, sperm and strength: what the trials of ashwagandha in men found, how big the effects were, what didn't work (erectile dysfunction in one trial), what dose was used and who should check with a doctor first.
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Ashwagandha for Sleep
Five placebo-controlled trials point the same way: a small but real improvement in sleep, larger in people with insomnia and after 8 weeks or more. Here's what each trial found, what dose they used, how it compared with melatonin, and what's known about the best time of day.
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Creatine Side Effects
Hair loss, kidney damage, bloating, dehydration, stomach upset: what the controlled trials found for each, including a 2025 randomized hair-loss trial and two kidney trials, plus the dose used and who should check with a doctor first.
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Creatine for Women
Muscle, bone, mood and weight: what randomized trials of creatine in women found, with a focus on menopause and women over 40, how much to take, what the evidence can't say yet (perimenopause, pregnancy), and who should check with a doctor first.
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Himalayan Shilajit
Himalayan shilajit for men and for women: what each human trial found (testosterone, sperm, strength, bone, skin), the doses used, why "Himalayan" isn't a quality guarantee, and the safety cases worth knowing about.
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Lion's Mane Side Effects
Stomach upset, headache, rash and allergy: what the human trials and a 2025 systematic review report about lion's mane side effects, what the animal toxicology shows, the doses trials used, and who should check with a doctor first.
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Nootropics for ADHD
An evidence check, not a recommendation: what reviews of omega-3, Bacopa, L-theanine, caffeine, ginkgo, vitamin D and minerals found for ADHD, why most of it is low quality, and why supplements don't replace treatment.
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