Cong Bai (Scallion or Green Onion)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Cong Bai?

  Roughly 3–10 g, using the white bulb with the roots attached — often counted in whole stalks rather than weighed, since this is a kitchen ingredient. Sources commonly specify three to five bulbs for a home preparation. Because the active aromatic compounds are volatile, it is traditionally added near the end of a decoction rather than boiled at length, and it is used fresh, not dried and stored.

  • Part used — the white bulb, with the fine roots; the green tops are food rather than the medicinal part.
  • Preparation — added late to a decoction to preserve the volatile aromatics; also taken as a hot congee or broth at the onset of a chill.
  • Course — short by nature, since its indication is the first day or two of a wind-cold pattern.

  Source: Sacred Lotus sources & references; cross-referenced against multiple online sources and standard materia medica ranges. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Cong Bai?

  Cong Bai is an ordinary food eaten daily by a large share of the world’s population, so the cautions are proportionate: the main traditional one is not to use it where the person is already sweating. Its whole purpose is to open the exterior and produce a light sweat, so in spontaneous sweating — or in exterior-deficiency patterns where the surface is already loose — it works against what is needed.

  • Spontaneous sweating — the standard classical caution, and the one in our own record.
  • Heat patterns — a spicy, warm herb is not appropriate for a wind-heat cold with sore throat and fever.
  • Large medicinal quantities — culinary amounts are simply food; the caution applies to concentrated or repeated medicinal doses.
  • Allergy — allium sensitivity is uncommon but real, as with any food.

  Is it true that you should not combine scallion with honey?

  This is a genuine and widely repeated classical dietary caution, but we could not substantiate it. The prohibition on taking Cong Bai together with honey appears in traditional dietary-incompatibility lists and is carried in our own long-standing record, so it belongs here as part of the tradition. However, a search of the biomedical literature returns no studies of scallion–honey toxicity or interaction, and we found no case reports, no proposed mechanism, and no modern verification of any kind.

  Our honest assessment: we report the honey caution as traditional dietary lore that we cannot verify. We are not asserting that the combination is harmful, and nothing we could find supports that it is. It is recorded because it is part of the classical literature on this herb and readers will encounter it elsewhere — not because it has been demonstrated.

  Source: Sacred Lotus sources & references (existing caution) and classical dietary-incompatibility lists; cross-referenced against multiple online sources. Verification status determined by a PubMed search for scallion/green onion/Welsh onion combined with honey and toxicity, which returned no records.

Chinese Herb Toxicity & Overdose

• None recognised. Cong Bai is a common food with a very long dietary history and no toxicity is attributed to it in the materia medica. The realistic concerns are ordinary food ones: allium allergy or intolerance in sensitive individuals, and digestive discomfort from large raw quantities.

  Source: materia medica consensus; cross-referenced against multiple online sources. Reference note, not a safety guarantee.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Cong Bai (Allium fistulosum)?

  Yes — but almost all of it studies the scallion as a food and a source of sulfur chemistry, not as a treatment for the common cold. Allium fistulosum has been reviewed as a nutritionally and therapeutically significant vegetable crop, and its characteristic organosulfur compounds, flavonoids and phenolics are the focus of the chemistry work. No verified clinical trial supports its traditional wind-cold indication, and readers should not expect one.

  • Food and nutrition review — a 2023 review surveys green onion’s distribution, culinary role, nutritional profile and associated health properties across cuisines, positioning it within current interest in nutrient-dense vegetables.
  • Chemistry of the white bulb — a study of the Japanese ‘Kujou’ cultivar isolated novel cyclic sulfur-containing compounds (the kujounins and thiolane-type compounds) specifically from the white parts of the plant — which is precisely the portion used as Cong Bai. A neat convergence between the traditional part-selection and the chemistry.
  • Antioxidant and antiproliferative activity — total phenol and flavonoid content, antioxidant capacity, and antiproliferative activity against cancer cell lines in Allium fistulosum vary measurably with growing conditions such as nitrogen fertilisation. Laboratory work; relevant to it as a food crop, not to any clinical use.
  • Metabolic effects (animal) — aqueous and ethanolic Welsh onion extracts attenuated high-fat-diet-induced obesity in an animal model. Preclinical and unrelated to the traditional indication.

  The honest summary: the research profile here is that of a healthy aromatic vegetable, which is essentially what Cong Bai is. Its standing in Chinese medicine rests on centuries of traditional use at the onset of wind-cold, not on clinical trial evidence.

  Sources: PMID 38137307 (Foods, 2023 — green onion as food, nutritional and therapeutic crop); PMID 30535771 (Journal of Natural Medicines, 2019 — cyclic sulfur-containing compounds from the white parts of Allium fistulosum ‘Kujou’); PMID 34221743 (PeerJ, 2021 — phytochemical, antioxidant and antiproliferative activity); PMID 29558911 (BMC Complementary and Alternative Medicine, 2018 — Welsh onion extracts and diet-induced obesity, animal model). Research context, not a therapeutic claim.

Chinese Herb Notes

• Is Cong Bai the same as the scallions I cook with, and how does it compare to other wind-cold herbs?

  Yes — it is the same plant. Cong Bai is the white bulb portion of Allium fistulosum, the Welsh onion / bunching onion, which is what is sold in most of the world as scallion, spring onion, or green onion. There is no special medicinal cultivar. That everyday familiarity is the point: it makes Cong Bai the most accessible entry in the entire exterior-releasing category, and it is the herb most often reached for at home rather than dispensed from a pharmacy.

  How it sits among its neighbours:

  • Compared with Ma Huang and Gui Zhi — Cong Bai is far milder. The strong wind-cold herbs are dispensed by practitioners for a definite pattern; Cong Bai is gentle enough to be a household measure at the first shiver.
  • Compared with Sheng Jiang (fresh ginger) — the other kitchen herb in this group. Both are spicy, warm, and used at the onset of a cold; ginger leans toward the Stomach and nausea, while Cong Bai is specifically credited with unblocking the yang qi and clearing a blocked nose.
  • Its niche — the earliest stage. Once a cold is established, or once there is heat, sore throat, or sweating, it is no longer the right herb.

  Botanical note: Some sources give the source plant as Allium fistulosum and others as the bulb onion Allium cepa or its varieties, reflecting the genuine regional variation in which allium is sold as “scallion.” Our record’s Bulbus Allii Fistulosi follows the standard pharmaceutical name and is the mainstream identification; readers using local produce should be aware the alliums vary between markets.

  Source: Sacred Lotus sources & references; cross-referenced against multiple online sources and materia medica consensus; botanical background from PMID 38137307 (Foods, 2023 — review of Allium fistulosum as a food and therapeutic crop).