October 22, 2026 4 min read

Supplements for perimenopause brain fog, compared

Short answer: No supplement has strong evidence for perimenopause brain fog, and almost none have been tested in women going through the transition. Of the common options, bacopa and creatine have the most trial data for memory and thinking in adults, lion's mane and gotu kola have early or traditional evidence, magnesium and ashwagandha are mostly studied for sleep and stress, and ginkgo and omega 3 have largely disappointed in memory trials. The table below compares them side by side on evidence, time to judge and cautions.

How we rated the evidence

Some: several controlled trials in adults, with modest or mixed benefits for memory or thinking.
Early: few or small trials, with mixed results or results only in specific groups.
Traditional: long use in traditional medicine, little human trial data.
Indirect: studied mainly for sleep, stress or mood, which can affect thinking.
Disappointing: larger trials found little or no benefit for memory in healthy adults.

None of these ratings is specific to perimenopause, because those trials mostly do not exist yet.

The comparison table

Ingredient	What it is	Evidence for memory and thinking	Time to judge	Check with a doctor if you
Bacopa monnieri	Ayurvedic herb	Some. A meta analysis of nine trials found small improvements in attention and reaction speed. (Kongkeaw et al., 2014)	12 weeks or more	Take thyroid medication, sedatives or antidepressants; it can upset the stomach
Creatine	Compound found in meat and fish	Some. A review of six trials found possible gains in short term memory and reasoning. (Avgerinos et al., 2018)	4 to 8 weeks	Have kidney disease
Lion's mane	Edible mushroom	Early. A small trial of 30 adults aged 50 to 80 with mild memory problems found gains that faded within four weeks of stopping. (Mori et al., 2009)	8 to 16 weeks	Are allergic to mushrooms
Gotu kola	Traditional Asian herb	Traditional. Long use for mental clarity, little human trial data.	8 weeks or more	Have liver disease (rare liver reports)
Panax ginseng	Traditional root	Early. Small trials with mixed results, and a Cochrane review found no convincing benefit for memory in healthy adults. (Geng et al., Cochrane, 2010)	4 to 8 weeks	Take blood thinners, diabetes or blood pressure medication
Magnesium	Mineral	Indirect. May help sleep and tension in people who are low; little direct evidence for memory.	2 to 4 weeks	Have kidney disease; high amounts cause loose stools
Ashwagandha	Ayurvedic root	Indirect. Trials mostly on stress and sleep.	4 to 8 weeks	Have thyroid or liver problems, or take sedatives
Omega 3 (fish oil)	Fatty acids	Disappointing. A Cochrane review of trials in healthy older adults found no benefit for memory. (Sydenham et al., Cochrane, 2012)	12 weeks or more	Take blood thinners
Ginkgo biloba	Tree leaf extract	Disappointing. A large trial of over 3,000 adults aged 75 and older, followed for about six years, found it did not slow the decline in memory and thinking. (Snitz et al., JAMA, 2009)	Not recommended for memory on current evidence	Take blood thinners

"Time to judge" is a rough guide from how these were studied, not a promise that you will notice anything.

What the table means in practice

Fix the basics first. Poor sleep, low iron, thyroid problems, low B12 and low mood all affect thinking, and a blood test can check iron, thyroid and B12.
Change one thing at a time. If you start three supplements at once, you will not know which one helped.
Give it a fair window, then stop if nothing has changed.
Read the label. Look for third party testing or a Certificate of Analysis, and be wary of any product that says "clinically proven" or promises to prevent decline.
Tell your doctor about every supplement you take, especially with hormone therapy or regular medication.

Single ingredients or a blend?

Single ingredients make it easier to see what is working. Blends combine several herbs in one capsule, which is simpler to take but harder to compare with trials, because blends are rarely tested as a whole.

Our own product, Clear Cognition, is a blend, so weigh this paragraph with that in mind. It is one capsule a day of six botanicals, including gotu kola and bacopa, with no hormones, made for women in the perimenopause years to support memory and word recall, focus and mental clarity, and a calm, steady mind.* No trial has tested these six together. The full label and cautions are in Clear Cognition questions, answered.

Measure whatever you try

Start a weekly score before you begin and keep it going. The free 90 Day Word Log takes two minutes a week and tracks word finding, names and focus, so you can see whether anything is actually changing.

Get the free 90 Day Word Log