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Reishi

Also known as: Ganoderma lucidum, lingzhi

Low concern

Reishi has been consumed for centuries and is generally well tolerated at culinary doses. Concentrated extracts may interact with anticoagulant and immunosuppressant medications, and rare cases of liver toxicity have been reported with prolonged high-dose use.

What it is

A medicinal mushroom (Ganoderma lucidum) traditionally used in East Asian medicine, sold as powder or extract.

Added as a functional/adaptogen ingredient in supplements, teas, coffees, and tonics.

Why it's flagged

May interact with blood thinners and immunosuppressants
Rare reports of liver toxicity at high doses

Regulatory status

United States — FDA

Permitted as a dietary supplement ingredient

European Union — EFSA

Permitted as a food / novel food ingredient depending on form

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