Lian Qiao (Forsythia suspensa fruit) is one of the most widely used herbs in Traditional Chinese Medicine, classified as bitter and slightly cold in nature, acting on the Heart, Lung, and Gallbladder meridians. It is the foundational herb in the classical formula Yin Qiao San (Silver and Forsythia Powder), which has been used for millennia to treat wind-heat invasions presenting as fever, sore throat, and upper respiratory symptoms. Modern phytochemical research has identified a range of bioactive compounds—most notably forsythosides and phenylethanoid glycosides—responsible for its antimicrobial, antiviral, anti-inflammatory, and antioxidant activities.

Lian Qiao's primary active compounds, particularly forsythoside A and phillyrin, inhibit pro-inflammatory cytokine production (including TNF-α, IL-6, and IL-1β) via suppression of NF-κB and MAPK signaling pathways. The herb also demonstrates broad-spectrum antimicrobial activity against both gram-positive and gram-negative bacteria, and antiviral effects against respiratory pathogens including influenza A. Forsythoside A has been specifically investigated for its ability to disrupt bacterial biofilm formation and inhibit neuraminidase activity in influenza viruses.

In TCM clinical practice, Lian Qiao is most commonly used as part of a multi-herb decoction or in classical granule formulas. Standardized extracts in capsule or tablet form are available in Western markets, often standardized to forsythoside A content. The herb is most clinically documented in the context of combination formulas such as Yin Qiao San and Shuang Huang Lian (a preparation also containing Huang Qin and Jin Yin Hua), which have been more rigorously studied than Lian Qiao in isolation.

• Upper respiratory infections (common cold, influenza)
• Fever
• Bacterial skin infections and boils
• Sore throat / pharyngitis
• Inflammation (systemic and local)

• Progression of early-stage wind-heat respiratory illness to deeper infection (traditional TCM use supported by combination formula clinical data, particularly Yin Qiao San used at symptom onset)

• Forsythia fruit tea (dried Lian Qiao decoction) — The only direct dietary source; dried Forsythia suspensa fruit prepared as a tea is the traditional administration method and delivers forsythosides and phillyrin directly.
• Green tea — Rich in catechins (EGCG) with overlapping antimicrobial and NF-κB-inhibiting anti-inflammatory activity, supporting similar immune defense and fever-resolving pathways.
• Elderberry (Sambucus nigra) — Contains anthocyanins and flavonoids with documented antiviral activity against influenza; supports the same respiratory antiviral pathway targeted by Lian Qiao.
• Ginger — Gingerols and shogaols inhibit pro-inflammatory cytokines (TNF-α, IL-1β) via NF-κB suppression, complementing Lian Qiao's anti-inflammatory mechanism in upper respiratory conditions.
• Garlic — Allicin and organosulfur compounds provide broad-spectrum antimicrobial activity against gram-positive and gram-negative bacteria, supporting the same anti-infective biological pathway as Lian Qiao.

• Nausea
• Diarrhea or loose stools (particularly with prolonged use or high doses)
• Mild gastrointestinal discomfort or cramping
• Reduced appetite (in sensitive individuals or with high doses)
• Potential allergic reaction in those sensitive to the Oleaceae plant family
• Possible exacerbation of spleen-qi deficiency symptoms in vulnerable individuals (TCM classification)

• Recommended daily: Traditional decoction: 6–15 g dried fruit per day in divided doses. Standardized extract (standardized to forsythoside A): typically 400–800 mg per day in divided doses; follow manufacturer's standardization specifications. In classical formulas such as Yin Qiao San, Lian Qiao is typically used at 6–10 g per formula dose.
• Best time of day: Traditionally taken 2–3 times daily at evenly spaced intervals; for acute infections, doses may be taken every 4–6 hours while symptoms are active.
• With or without food: Can be taken with or without food; taking with light food may reduce the risk of gastrointestinal discomfort, particularly for individuals with sensitive digestion.
• Time to effect: Acute conditions (fever, respiratory infection): noticeable effects within 2–5 days. Anti-inflammatory benefit: 5–10 days of consistent use.
• How long to take it: Intended for short-term use during acute illness (5–14 days maximum per episode). Not traditionally used as a long-term daily supplement. Extended use beyond 2–3 weeks is not supported by safety data and is discouraged in TCM for cold-natured herbs in the absence of ongoing heat conditions. Consult a practitioner for repeated or prolonged use.