A positive test in a small study is a research lead, not a general performance guarantee. With gotu kola, consider individual findings alongside the overall analysis. This keeps possible benefits visible without overstating their certainty.
An example from a small human trial
A 2008 randomized trial investigated 28 healthy older people over two months. Certain working-memory measurements improved in the highest tested extract group; reported mood also changed. The small sample does not allow reliable extrapolation to all age groups or every product. [1]
What the combined studies showed
A 2017 systematic review included five trials of Centella alone and six of blended products. The meta-analysis showed no statistically clear advantages over placebo in the cognitive domains. Some mood findings were more favorable, but formulas and study designs differed. [2]
These statements do not necessarily conflict. One favorable finding can remain uncertain in a broader analysis. This justifies further research, not reliable treatment success for forgetfulness.
| Question | What should be distinguished |
|---|---|
| Who was studied? | Healthy older people, young adults and people with illnesses. |
| What was given? | A defined extract, tea or blend. |
| What improved? | Mood, alertness and a particular memory test. |
| How certain is the result? | An individual signal and confirmed general benefit. |
Take rare risks seriously too
LiverTox describes rare reports of acute liver injury with jaundice after Centella preparations. In individual cases, possible contamination or other causes could not be conclusively excluded. This is a safety signal, not a calculable frequency for every product. [3]
Discuss a planned supplement with a professional when existing conditions or medicines are involved. New yellowing of the skin or eyes is not a desirable adaptation sign and needs prompt medical assessment.
Describe your concern more precisely
Record a typical task that has become harder and what changed at the same time. A clearly described problem helps more than attempting to boost brain function in general. A preparation should not delay necessary investigation of causes.
Frequently asked questions
Are there any human studies?
Yes. Their size and results nevertheless limit broad claims.
Is greater alertness the same as better memory?
No. These outcomes need separate consideration.
Does an extract trial automatically apply to tea?
No. The specific preparation is part of the investigation.
Does rare mean impossible?
No. Rarely reported risks also belong in the decision.
Read more: Gotu kola in skin care and Memory research using SmartAge as an example.
Sources
[1] Wattanathorn et al., 2008, PMID 18191355. [2] Puttarak et al., 2017, PMID 28878245. [3] NIDDK/LiverTox: Centella asiatica. Sources linked in the text; date: September 30, 2026. Not individual memory or liver treatment.
