USA Authorized Cognizil Retailer30 ml · 30 days15.47 mg blend, 21 ingredients180-day window on the sales page kits
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How to take it

The label is short and unambiguous, which is more than many liquid supplements manage. Everything below either comes from it or is flagged as general practice.

Last updated September 22, 2026By Cognizil Editorial Desk

From the label

The directions, verbatim

Quick answer

Shake well before each use. Take 1 dropperful daily. Place in mouth and swallow. One dropperful is one millilitre. A 30 ml bottle is 30 servings, so 30 days.

Serving size
1 ml, described on the label as one dropperful
Frequency
Once daily
Route
Place in mouth and swallow
Before use
Shake well before each use
Servings per bottle
30
Age
Adults 18 and over. Not for use if pregnant or nursing

Shake well is not filler

A suspension of botanical extracts in water separates. The instruction to shake is the manufacturer telling you that the contents are not uniformly distributed at rest. Skipping it means the first doses from a bottle and the last doses are not the same.

The measure

What a dropperful means

A dropperful is a dropper drawn to its fill line, which on a standard 30 ml supplement dropper is one millilitre. It is not a full pipette and it is not a squeeze until it stops.

  1. Squeeze the bulb fully with the tip out of the liquid.
  2. Put the tip in, release the bulb once, and let it fill.
  3. The liquid should sit at the graduation mark if the dropper carries one. If it does not, one full bulb release from a standard 30 ml dropper is close to 1 ml.
  4. If the bottle runs out before thirty days, the servings were bigger than one millilitre. That is the practical check.

Thirty servings from 30 ml is the arithmetic the label publishes. A bottle that empties in twenty-four days is telling you the dropper is being overfilled, and the label says not to exceed the recommended dose.

When

Timing

The label does not specify a time of day, with or without food. Where a label is silent, this site does not invent an instruction. What follows is general practice and is labelled as such.

General practice where the label is silent.
QuestionWhat can reasonably be said
Morning or eveningGuarana carries caffeine and the label does not say how much. Morning is the cautious default for anything containing caffeine.
With or without foodNot stated. Taking it the same way each day matters more than which way.
Same time dailyHelps adherence, which is the variable most likely to determine whether you finish the bottle.
Missed a dayTake the next one as normal. The label says not to exceed the recommended dose, so do not double up.

The caffeine unknown

Guarana sits fourth on the blend and its ceiling is 3.87 mg of extract, or up to 77 mg of raw-herb equivalent if the 20:1 ratio is granted. The caffeine content of that is not stated anywhere on the label. If you are caffeine-sensitive, morning dosing removes the question.

Duration

How long to give it

The trials behind the botanicals on this list ran between four and twelve weeks for cognitive endpoints. A single thirty-day bottle is shorter than most of them.

That is an argument for deciding up front how long you intend to run the trial on yourself, and buying accordingly, rather than buying one bottle and deciding at day thirty. The 180-day guarantee on the sales page kits exists precisely because the seller expects a longer run.

  1. Write down why you are taking it

    One sentence, before the first dose. What would have to change for you to call this worthwhile?

  2. Pick the measure

    Something you can actually observe: how often you lose a word, how many times you re-read a paragraph, how you feel at 3pm. Not a feeling in retrospect.

  3. Note the baseline for a week before you start

    Almost nobody does this, and it is the single thing that makes the rest of the exercise mean anything.

  4. Run it for the bottle

    Thirty days, same time, same way, with the shake.

  5. Read your own notes, not your memory

    Recall of how you felt a month ago is the least reliable instrument available to you.

  6. Decide once

    Continue deliberately or stop. Continuing by momentum is how people end up six bottles in with no view either way.

The small print

Storage and safety, as printed

Storage
Keep away from heat, light, and humidity to preserve freshness.
Caution
Do not exceed recommended dose. Not for use by individuals under the age of 18, or by pregnant or nursing women. Individuals with a known medical condition should consult a physician before using this or any dietary supplement.
Keep out of reach
KEEP OUT OF THE REACH OF CHILDREN. DO NOT USE IF SAFETY SEAL IS DAMAGED OR MISSING.

Xylitol

The Other Ingredients line includes xylitol, which is severely toxic to dogs. The label carries no pet warning. Store it closed and out of reach, and contact a vet immediately if a dog swallows any.

Cautions and interactions →The whole label →

See the Cognizil packs

Two, three or six bottles, priced plainly, with a 180-day window on the sales page kits. Read the best case first, then decide.

See the priceRead the best case

Shipping is calculated at checkout. This site publishes no figure it was not given.

Sources

References

Every source below was opened and read. Nothing here cites a study we did not read, and no identifier on this site was written from memory.

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  4. U.S. Food and Drug AdministrationGrapefruit Juice and Some Drugs Don’t Mix — FDA.gov · source
  5. U.S. Food and Drug AdministrationFDA Calls on Certain Firms to Stop Producing and Issuing Misleading ‘FDA Registration Certificates’ — FDA.gov · source
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  7. Shin, Lee, Yang, Lim & Ernst — 2010Maca (L. meyenii) for improving sexual function: a systematic review — BMC Complementary and Alternative Medicine · PMID 20691074 · source
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  9. Centre for Reviews and DisseminationThe efficacy of Irvingia gabonensis supplementation in the management of overweight and obesity: a systematic review of randomized controlled trials — NCBI Bookshelf (DARE) · NBK132337 · source
  10. Zhang, Liu, Li et al. — 2016The impact of grape seed extract treatment on blood pressure changes: a meta-analysis of 16 randomized controlled trials — Medicine (Baltimore) · PMID 27537554 · source
  11. Congretel, Bonnet, Gaudel et al. — 2023Effect of Guarana (Paullinia cupana) on Cognitive Performance: A Systematic Review and Meta-Analysis — Nutrients · PMID 36678305 · source
  12. European Medicines Agency, Committee on Herbal Medicinal ProductsAssessment report on Eleutherococcus senticosus (Rupr. et Maxim.) Maxim., radix — ema.europa.eu · source
  13. Schaffler, Wolf & Burkart — 2013No benefit adding Eleutherococcus senticosus to stress management training in stress-related fatigue/weakness, impaired work or concentration — Pharmacopsychiatry · PMID 23740477 · source
  14. Pop, Cherecheș, Buzoianu et al. — 2021Standardized astragalus extract for attenuation of the immunosuppression induced by strenuous physical exercise: randomized controlled trial — Journal of the International Society of Sports Nutrition · PMID 34271953 · source
  15. Zhang, Lin, Xu, Leung & Chan — 2014Astragalus (a traditional Chinese medicine) for treating chronic kidney disease — Cochrane Database of Systematic Reviews · CD008369.pub2 · source
  16. European Food Safety Authority — 2018Scientific opinion on the safety of green tea catechins — EFSA Journal · DOI 10.2903/j.efsa.2018.5239 · source
  17. National Institute of Diabetes and Digestive and Kidney DiseasesGymnema, in LiverTox: Clinical and Research Information on Drug-Induced Liver Injury — NCBI Bookshelf · NBK610217 · source
  18. Godard, Johnson & Richmond — 2005Body composition and hormonal adaptations associated with forskolin consumption in overweight and obese men — Obesity Research · PMID 16129715 · source
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  20. Zsiborás, Matics, Hegedűs et al. — 2023The effects of capsaicin intake on weight loss among overweight and obese subjects: a systematic review and meta-analysis of randomised controlled trials — British Journal of Nutrition · PMID 36938807 · source
  21. Takeoka, Dao, Wong, Lundin & Mahoney — 2001Identification of benzethonium chloride in commercial grapefruit seed extracts — Journal of Agricultural and Food Chemistry · PMID 11453769 · source
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TimelineWhat the studies measured, and when.Read it →Side effectsInteractions worth knowing.Read it →The best caseWhat one millilitre can carry.Read it →
Cognizil — 30 ml, 30 days21 ingredients in 15.47 mg · from $49 a bottleSee the packs