Rehmannia

At a Glance

Common name

Rehmannia

Scientific name

Rehmannia glutinosa

Family

Scrophulariaceae

Region

East Asia

Plant part

Root (raw or prepared)

Caffeine

Caffeine Free

Evidence

Insufficient

Safety review

Safety information on file

Botanical Description

A leafy perennial with a basal rosette of large wrinkled green leaves, tall spikes of tubular reddish-purple foxglove-like flowers, and a thick orange-brown tuberous root. The root is the medicinal part.

Also known as: Di Huang, Chinese Foxglove, Sheng Di Huang (raw), Shu Di Huang (prepared)

Historical Background

A premier TCM 'yin-nourishing' tonic, rehmannia appears in classic formulas such as Liu Wei Di Huang Wan. Raw and wine-prepared forms serve different purposes.

Earliest recorded uses: Febrile illness with thirst, yin deficiency, and as a blood and essence tonic in TCM.

Cultural significance: Among the most prescribed tonics in modern Chinese medicine for aging, fatigue, and menopause-related patterns.

1. Classical TCM

   Recorded in the Shennong Bencao Jing for blood and yin.

2. Song dynasty

   Liu Wei Di Huang Wan codifies rehmannia as a yin tonic base.

Traditional Uses

These uses document historical traditions and do not imply proven effectiveness.

Flavor & Aroma

Aroma: Earthy, rooty, slightly sweet

Tea Preparation

Modern Evidence

Iridoid glycosides (catalpol) and acteoside are studied for anti-inflammatory and metabolic effects; clinical evidence for tonic outcomes is limited and mostly from TCM practice.

Evidence levels describe the state of research for the traditional use discussed here, not a recommendation. Historical use does not imply effectiveness.