Which herb is commonly used for infections and immune support?

• A. Echinacea angustifolia/pallida/purpurea (Echinacea)
• B. Ephedra sinica (Ephedra)
• C. Dioscorea villosa (Wild Yam)
• D. Eschscholzia californica (California Poppy)

Answer: (A)

The key idea here is recognizing which herb is most associated with supporting the immune system and fighting infections. Echinacea is widely used for infections, especially at the onset of colds and other upper respiratory infections, and for immune support. Its active constituents—polysaccharides and phenolics like cichoric and other caffeic acid derivatives—are thought to stimulate non-specific immune responses, enhancing macrophage activity and modulating cytokine signaling, while also showing some antimicrobial properties. Clinically, it’s commonly prepared as tinctures or liquid extracts for early illness, or taken as a short course to bolster immune defenses.

The other herbs listed have different primary roles: Ephedra sinica is a stimulant with bronchodilator effects used for respiratory symptoms via sympathetic activation, not primarily for immune support; wild yam is valued for anti-inflammatory and antispasmodic effects rather than immune modulation; and California poppy is mainly a nervine sedative and analgesic, not an immune-supportive or anti-infective agent.