Quick answer

NCCIH says trouble sleeping is the most common side effect of Asian ginseng. In trials, sleep problems and other mild events were about as common on placebo as on ginseng, according to a systematic review of adverse effects. Ask your doctor if ginseng seems to be disturbing your sleep.^1,2

Key facts

NCCIH calls trouble sleeping the most common side effect of Asian ginseng.¹
A systematic review found that adverse events with ginseng alone were about as frequent as with placebo, most often headache, sleep problems and digestive complaints.²
In a 4-week trial in healthy adults, insomnia was reported in both the ginseng and placebo groups, and no serious reactions occurred.³
NIH's LiverTox database lists trouble sleeping, nausea, headache and nosebleeds among the mild effects of ginseng.⁴

What do NIH sources say about ginseng and sleep?

Two NIH sources name sleep as the most common problem. NCCIH says so directly, and LiverTox, the database NIH keeps on liver injury from medicines and supplements, lists trouble sleeping first among the effects it calls uncommon and mild.^1,4

Trouble sleeping is the most common side effect of Asian ginseng.^1,4

Other reported side effects are usually mild, such as headache, nausea, diarrhea in the morning and nosebleeds. In trials, side effects with ginseng alone were about as common as with placebo.^2,4

How often does it happen in trials?

Trials add a qualification to the word most common, because placebo groups report sleep problems too. The studies below looked at ginseng alone, and they compare it with an inactive pill.^2,3

What studies found about sleep problems with ginseng^2,3,5
Source	What was studied	What was reported
Systematic review of adverse effects, 2002	Published data on Panax ginseng root extracts	Adverse events with single-ingredient ginseng were about as frequent as with placebo; headache, sleep and digestive problems were the most common
Randomized trial in healthy adults, 2012	1 g or 2 g a day of root extract, or placebo, for 4 weeks	Mild events including insomnia and constipation occurred in both the ginseng and placebo groups; no serious reactions
Randomized trial in 50 adults with long-lasting fatigue, 2020	Korean red ginseng, 3 g a day, or placebo, for 6 weeks	No adverse events reported

The 2002 review also found that products combining ginseng with other ingredients had been linked to more serious events, which makes it hard to say what a blend does. A person who takes ginseng in a product with caffeine or other stimulants cannot tell from these studies which part is keeping them awake.²

What other effects are listed alongside sleep problems?

People who search on this question often ask about anxiety, high blood pressure, headaches or diarrhea, so it helps to see the lists side by side. NIH's lactation database, which covers adult side effects of ginseng, names headache, high blood pressure, diarrhea, sleeplessness and skin rash as the most common, and adds nervousness with long-term use. NCCIH's list is shorter: trouble sleeping first, then rare severe rash, liver damage and severe allergic reactions.^1,6

Anyone who notices these effects is describing something a doctor will want to hear about, together with the product label.⁶

What is not known?

None of the sources we read says how large an amount, or how late in the day, is more likely to disturb sleep. The trials above were not designed to answer that. NCCIH says most ginseng trials have been small and shorter than 3 months, so effects of long use are also unclear.^1,3

Who should ask a doctor?

Anyone whose sleep has worsened since starting ginseng should ask a doctor or pharmacist whether the product could be the cause.
Anyone with high blood pressure or on blood pressure medicine should ask before using it, since NIH's lactation database lists high blood pressure among the reported effects.⁶
Anyone taking warfarin should ask a pharmacist, because its label names ginseng among botanicals that may change its effect.⁷
Anyone with long-lasting trouble sleeping should ask a doctor, since the cause may have nothing to do with a supplement.

Questions people ask

Does ginseng cause anxiety?

NCCIH does not list anxiety, but NIH's lactation database lists nervousness among the effects seen with long-term use. Ask your doctor if ginseng makes you feel on edge.^1,6

Does ginseng cause high blood pressure?

NIH's lactation database lists high blood pressure among the most common side effects in adults, while NCCIH's page does not. Ask your doctor if you take blood pressure medicine.^1,6

Does ginseng cause headaches or diarrhea?

LiverTox lists headache and nausea among mild effects, and a systematic review found headache among the most common events with ginseng, at rates similar to placebo. NIH's lactation database also lists diarrhea.^2,4,6

Does ginseng cause constipation, weight gain or hair loss?

Constipation was reported in both the ginseng and placebo groups of one 4-week trial. The sources we read do not report weight gain or hair loss, which is not a finding either way.³

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Sources

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.