Also known as: Panax quinquefolius, Cereboost, North American ginseng, Ginsenosides
BotanicalGood evidence
A distinct species from Asian ginseng with a different ginsenoside profile and a calmer character. The cognitive research is genuinely interesting, with effects appearing within hours.
Typical dose
200.0–400.0 mg per day
1-2 hours before demanding mental work
What it is
American ginseng is Panax quinquefolius, native to eastern North America and a separate species from Asian ginseng, Panax ginseng.
Both contain ginsenosides, but in different proportions. American ginseng is higher in Rb1 and lower in Rg1, which is the chemical basis for its reputation as the calmer of the two.
Traditional Chinese medicine classifies them oppositely: Asian ginseng as warming and stimulating, American as cooling. That distinction happens to line up reasonably well with what the modern research shows.
How it works
Ginsenosides influence neurotransmitter systems including acetylcholine and dopamine, and support cerebral blood flow, which underlies the cognitive findings.
American ginseng also has documented effects on how the body handles glucose after a meal, which may contribute to the steadier mental energy people report.
Gut bacteria convert ginsenosides into more absorbable compounds, so individual response varies with the microbiome, in a similar way to pomegranate and urolithin A.
What the evidence shows
Cognitive research is the strongest area, with controlled trials in healthy adults reporting improvements in working memory and reaction time within one to six hours of a single dose.
Several trials have used a standardised extract and reported effects on both memory and calmness, and findings have come from more than one research group.
There is also a body of work on blood sugar handling after meals, and on fatigue during demanding periods. Trials are modest in size, and much of the cognitive research involves the same standardised extract.
Dosing
Cognitive trials have typically used 200 to 400 mg of extract standardised to around 10 per cent ginsenosides, taken as a single dose.
Because effects appear within one to six hours, this suits taking before demanding mental work rather than as a daily background supplement.
Check the Latin name, since Panax ginseng and Panax quinquefolius are sold under similar marketing and behave differently. American ginseng suits people who find Asian ginseng too stimulating or find it affects their sleep.
Cognitive effects reported within 1-6 hours of a dose
Timing
1-2 hours before demanding mental work
Competition status
Permitted — not on the WADA Prohibited List
Category
Botanical
Safety and side effects
American ginseng is generally well tolerated and tends to cause less restlessness and sleep disturbance than Asian ginseng. Headache and digestive upset are the occasional complaints.
Because it lowers blood sugar after meals, take particular care if yours is being managed, and be alert to it dropping lower than expected.
It may affect how readily blood clots. Speak to your doctor before use if you take anything affecting clotting or any regular medication, and stop before scheduled surgery.
Who should avoid it
Take particular care if your blood sugar is being managed, and speak to your doctor first in that case. Speak to your doctor before use if you take anything affecting blood clotting or any regular medication. Stop before scheduled surgery. Not established at supplemental doses in pregnancy or breastfeeding.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
