A slow-growing Korean and Chinese root, central to East Asian medicine for two thousand years. The most-studied of the true ginsengs, with modest evidence for energy, cognition, and immune support. Different in character from American ginseng — more warming and stimulating.

Adaptogen — helps the body cope with physical and mental stress
May modestly improve mental performance, especially under fatigue
Supports immune function, particularly during cold and flu season
May modestly improve erectile function and sexual performance in men
Some evidence for steadier blood sugar in type 2 diabetes
Generally taken in cycles — several weeks on, then a break — rather than continuously

Can cause overstimulation, insomnia, or anxiety — especially at higher doses

Use caution with blood thinners — ginseng has mild anticoagulant action

Use caution with stimulants and caffeine — additive effects

May lower blood sugar — caution with diabetes medication

Use caution with hormone-sensitive conditions — ginseng has weak estrogen-like activity

Skip with uncontrolled high blood pressure

Skip during pregnancy

Stop two weeks before surgery

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Asian ginseng