American ginseng is generally the better choice for anxiety. It has a calming, cooling profile compared to Korean (Asian) ginseng, which tends to be more stimulating and energizing. Both species contain active compounds called ginsenosides, but they contain different ratios of these compounds, which is why they affect your body differently. A third product often called “Siberian ginseng” (eleuthero) is not true ginseng at all and has shown negligible benefits for stress-related symptoms in clinical trials.
American Ginseng vs. Korean Ginseng
The two main species sold as ginseng supplements are American ginseng (Panax quinquefolius) and Korean or Asian ginseng (Panax ginseng, often sold as “Korean red ginseng”). Both belong to the same plant genus, but they grow in different climates and produce distinct chemical profiles. American ginseng is richer in certain ginsenosides associated with relaxation, while Korean ginseng has a higher concentration of the types linked to stimulation and energy.
This distinction matters for anxiety. In a double-blind crossover study of healthy adults, eight weeks of Korean ginseng extract (200 mg daily) produced a significant shift on mood scales from calm and relaxed toward excited and tense. That’s the opposite of what someone with anxiety wants. Korean ginseng did improve working memory and quality-of-life ratings, which suggests it may help people who feel mentally sluggish under stress, but it is not inherently calming.
American ginseng, by contrast, has shown stress-buffering effects in preclinical research. An American ginseng extract called G1899 reduced elevated stress hormones in chronically stressed animals and reversed stress-related behavioral problems, including social withdrawal and depression-like behavior. Notably, it only lowered stress hormones when they were already elevated. In unstressed animals, it had no effect on hormone levels, suggesting it works as a regulator rather than a sedative.
How Ginseng Affects Stress Biology
Your body responds to chronic stress through a system called the HPA axis, a communication loop between the brain and adrenal glands that controls cortisol release. When this system stays activated too long, cortisol levels remain high, fueling anxiety, sleep problems, and mental fatigue. American ginseng appears to dampen this overactive stress response. In animal models of chronic stress, the G1899 extract significantly reduced circulating stress hormones, likely by suppressing HPA axis activity.
Ginsenosides also interact with GABA receptors, the same brain receptors targeted by many prescription anti-anxiety medications. Intact ginsenosides from Panax ginseng have been shown to enhance GABA receptor activity, which promotes calm. However, once your body metabolizes ginsenosides, the breakdown products actually inhibit GABA activity. This means the calming effect may be more complex than simply “boosting GABA,” and it helps explain why the two ginseng species, with their different ginsenoside ratios, produce different subjective experiences.
Why Siberian Ginseng Falls Short
Siberian ginseng (Eleutherococcus senticosus) is marketed as an adaptogen for stress, but it is a completely different plant from true ginseng and contains none of the same active compounds. A randomized controlled trial of 144 people with chronic stress-related fatigue found that adding 120 mg per day of eleuthero extract to stress management training produced no meaningful benefit over stress management training alone. Any improvements participants experienced were attributed to the passage of time and the training itself, not the supplement. If anxiety is your concern, eleuthero is not a useful option.
How Long It Takes to Work
Ginseng is not a fast-acting remedy. Clinical studies typically measure outcomes at 4 to 8 weeks of daily use. The Korean ginseng mood study assessed participants at day 1, day 29, and day 57 of supplementation before finding significant mood changes. A separate study using Korean red ginseng for residual depression symptoms ran for 8 weeks at 3 grams per day before observing improvements. If you start taking ginseng for stress or anxiety, expect to wait at least a month before evaluating whether it’s helping.
Side Effects to Watch For
Both American and Korean ginseng can cause nervousness, insomnia, changes in blood pressure, vomiting, and diarrhea. The stimulating nature of Korean ginseng makes insomnia and jitteriness more likely with that species, which is another reason it’s a poor fit for anxiety. American ginseng is generally better tolerated by people who are already feeling wired or on edge, though individual responses vary.
If you take an SSRI, SNRI, or MAOI for anxiety or depression, be aware that ginseng has been linked to a rare but serious interaction called serotonin syndrome, where excess serotonin activity causes agitation, rapid heart rate, and muscle rigidity. The evidence for this interaction is limited, graded at the lowest levels of clinical certainty, but the risk is worth knowing about. Starting ginseng while on psychiatric medication is something to discuss with whoever prescribes your medication.
Choosing a Product
Look for supplements labeled “Panax quinquefolius” (American ginseng) rather than “Panax ginseng” (Korean/Asian). Study doses for American ginseng extracts have ranged from 200 mg to 400 mg daily. Standardized extracts that list ginsenoside content on the label give you more consistency between doses. Avoid products labeled simply “ginseng” without specifying the species, since the two types have meaningfully different effects.
Whole root, powdered root, and standardized extracts are all available. Standardized extracts are what most studies use because they deliver a controlled amount of active compounds. Red ginseng (steamed before drying) is almost always Korean ginseng and is the more stimulating option. White or unprocessed American ginseng root is the calmer choice.