Ci Xian Cai

Ci Xian Cai (Herba Amaranthi Spinosi) is the dried aerial parts of Amaranthus spinosus L., an annual herbaceous plant in the family Amaranthaceae. In the traditional TCM classification system, Ci Xian Cai is considered sweet in flavor with a cool nature. It enters the Large Intestine and Small Intestine meridians, giving it a central role in formulas that address Heat toxin, Blood Heat, Damp-Heat dysentery, and various bleeding disorders.

Botanical description: Amaranthus spinosus is an erect annual herb growing 30–100 cm tall. The stems are branched, green or reddish-purple, and somewhat succulent. The leaves are alternate, simple, and variable in shape, ranging from rhomboid-ovate to lanceolate, 2–8 cm long and 1–4 cm wide, with a pointed apex and cuneate base. The leaf margins are entire or slightly wavy. A distinctive feature of this species is the presence of sharp, slender spines (modified stipules) 5–15 mm long at each leaf axil, which give the plant its common name "spiny amaranth." The inflorescence consists of small, greenish flowers densely packed in axillary and terminal spikes. The seeds are small, lens-shaped, and shiny black. The entire plant is harvested in summer and autumn when flowering, then washed and sun-dried or shade-dried.

Habitat and distribution: A. spinosus is native to tropical and subtropical regions of Asia, Africa, and the Americas. In China, it is widely distributed in the southern provinces including Guangdong, Guangxi, Fujian, Yunnan, Guizhou, Sichuan, and Hainan. The plant is commonly found as a weed in cultivated fields, roadsides, waste areas, and along stream banks. It prefers warm, moist environments and rich, well-drained soils but is highly adaptable to poor soils and drought conditions. The plant is harvested from wild populations throughout its range, with collection typically occurring during the flowering stage in summer and early autumn when the concentration of bioactive compounds is considered highest.

Quality markers: High-quality Ci Xian Cai consists of intact aerial parts with stems, leaves, and inflorescences. The stems should be green to reddish-purple, slender, and succulent. The leaves should be green, intact, and free from insect damage or mold. The characteristic sharp spines at the leaf axils should be present. The odor is faint and herbaceous, and the taste is slightly sweet and bland. Material that is yellowed, moldy, or has lost its spines due to rough handling is considered inferior. In some traditions, the roots are also used and should be thin, fibrous, and light brown in color. The plant is sometimes used fresh in traditional practice, particularly for external applications and acute conditions.

In the traditional Chinese medicine theoretical framework, Ci Xian Cai is understood in terms of its effects on specific patterns of disharmony (zheng). Because Ci Xian Cai enters the Large Intestine and Small Intestine meridians and has a sweet, cool quality, it is traditionally indicated for a range of patterns involving Heat toxin, Blood Heat, and Damp-Heat.

Clearing Heat and resolving toxicity: Ci Xian Cai is traditionally used for conditions associated with Heat toxin (re du), particularly those affecting the skin, throat, and lymphatic system. In TCM theory, Heat toxin may manifest as sores, abscesses, swollen glands, sore throat, and skin eruptions. Ci Xian Cai is considered to clear Heat and resolve toxicity through its cool nature, making it suitable for acute inflammatory conditions. It is often used as a single herb in decoction for sore throat and tonsillitis, or combined with other toxicity-resolving herbs such as Pu Gong Ying and Jin Yin Hua in formulas for sores and abscesses. For skin conditions, it may be used both internally and externally as a wash.

Cooling Blood and stopping bleeding: Ci Xian Cai is traditionally used for bleeding disorders associated with Blood Heat (xue re). In TCM theory, when Heat enters the Blood level, it can cause the Blood to move erratically and leak from the vessels, resulting in various forms of bleeding. Ci Xian Cai is indicated for hematuria (blood in urine), hematochezia (blood in stool), uterine bleeding, and traumatic bleeding. Its cool nature is believed to cool the Blood and stop bleeding, while its sweet nature moderates its action. It is often combined with other Blood-cooling and hemostatic herbs such as Sheng Di Huang and Bai Mao Gen in formulas for Blood Heat bleeding. For traumatic bleeding, the fresh herb may be crushed and applied directly to the wound.

Treating dysentery and diarrhea: Ci Xian Cai is traditionally used for dysentery and diarrhea, particularly when there is Blood and mucus in the stool associated with Damp-Heat in the Large Intestine. In TCM theory, Damp-Heat accumulation in the Intestines can cause abdominal pain, tenesmus, and dysentery with Blood and pus. Ci Xian Cai is considered to clear Heat, resolve toxicity, and drain Dampness from the Intestines. It is often combined with other Heat-clearing and Dampness-draining herbs such as Bai Tou Weng and Huang Lian in formulas for bacillary dysentery. This traditional use is particularly common in folk medicine throughout southern China.

Treating traumatic injury: Ci Xian Cai is traditionally used for traumatic injury with swelling, bruising, and pain. When there is injury to the soft tissues, blood stasis and Heat toxin may accumulate locally, resulting in swelling and pain. Ci Xian Cai is traditionally used both internally and externally to clear Heat toxin, cool Blood, and reduce swelling. For external application, the fresh herb is pounded and applied as a poultice to the affected area. For internal use, it is decocted and taken to address the systemic effects of trauma. It is often combined with blood-moving herbs such as Hong Hua and Ru Xiang in trauma formulas.

Classical literature references: Ci Xian Cai has been documented in various regional materia medica and folk medicine texts throughout southern China. The Ling Nan Cai Yao Lu (Records of Lingnan Medicinal Materials) described Ci Xian Cai as able to "clear Heat, resolve toxicity, cool Blood, and stop bleeding." The Guangxi Zhong Cao Yao (Guangxi Chinese Medicinal Herbs) recorded its use for treating dysentery, sore throat, and traumatic bleeding. The Fujian Zhong Cao Yao (Fujian Chinese Medicinal Herbs) noted its ability to "reduce swelling and relieve pain" for traumatic injury. These classical sources reflect the regional traditional knowledge accumulated over centuries of practice in southern China.

Ci Xian Cai contains a range of bioactive compounds that have been the subject of pharmacological investigation. The following overview summarizes the major chemical constituents identified inAmaranthus spinosus and what is currently known about them from published research.

Betacyanins: Betacyanins are characteristic water-soluble pigments found in Amaranthus species, responsible for the red-violet coloration of the leaves and stems in pigmented varieties. The major betacyanins in Ci Xian Cai include amaranthin, isoamaranthin, betanin, and isobetanin. These compounds have been studied for their antioxidant, anti-inflammatory, and hepatoprotective properties. Betacyanins are potent free radical scavengers and have been shown to protect against oxidative stress in various pre-clinical models. They have also been investigated for their potential anti-cancer effects in cell culture studies. The betacyanin content varies significantly between green and red-purple varieties, with pigmented cultivars containing much higher levels.

Saponins: Ci Xian Cai contains various triterpenoid saponins derived from oleanolic acid, ursolic acid, and related aglycones. These saponins have been studied for their immunomodulatory, anti-inflammatory, and antimicrobial properties. Saponins are known for their ability to form soap-like foams in aqueous solution and have been investigated for their effects on cell membrane permeability. In pre-clinical studies, Amaranthus saponins have demonstrated anti-inflammatory activity through inhibition of pro-inflammatory cytokine production. They have also been studied for their potential anti-fungal and anti-parasitic effects. The saponin content is influenced by plant maturity, with higher levels typically found in mature plants.

Flavonoids: The flavonoid fraction of Ci Xian Cai includes quercetin, kaempferol, rutin, and their various glycosides. These flavonoids have been studied for their antioxidant, anti-inflammatory, and vasoprotective properties. Rutin is particularly abundant and has been investigated for its ability to strengthen capillary walls and reduce vascular permeability. Quercetin glycosides have been studied for their anti-allergic and anti-inflammatory activities. The flavonoid content of Ci Xian Cai is comparable to that of many leafy green vegetables and contributes to its overall antioxidant capacity. These compounds are relatively stable during cooking and drying, making them accessible from both fresh and processed plant material.

Oxalates and nitrates: Like many members of the Amaranthaceae family, Ci Xian Cai contains significant amounts of oxalates, primarily as soluble sodium and potassium oxalates and insoluble calcium oxalate crystals. The oxalate content can be substantial, particularly in mature leaves, and may be a concern for individuals with a history of calcium oxalate kidney stones or those with impaired oxalate metabolism. The plant also accumulates nitrates, especially when grown in nitrogen-rich soils. High nitrate intake can be problematic for infants and individuals with certain metabolic conditions. Traditional cooking methods such as boiling and discarding the cooking water can significantly reduce both oxalate and nitrate content.

Vitamins and minerals: Ci Xian Cai is nutritionally dense and contains significant amounts of vitamins and minerals. It is particularly rich in vitamin A (as beta-carotene), vitamin C, vitamin K, and folate. The mineral content includes iron, calcium, magnesium, potassium, and phosphorus. The high iron content has made it a valued food in traditional diets for preventing iron deficiency. However, the bioavailability of iron from plant sources is limited by the presence of oxalates and phytates. The high calcium content is similarly limited by oxalate binding. Despite these limitations, Ci Xian Cai remains an important nutritional resource in many traditional food systems.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans.

Ci Xian Cai is a component in several traditional formulas in the TCM tradition, particularly in regional and folk medicine from southern China. Below are three representative traditional applications that feature Ci Xian Cai, along with their traditional indications and the role Ci Xian Cai plays in each composition.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment.

Anti-inflammatory and analgesic activity: Extracts of Amaranthus spinosus have been studied for their anti-inflammatory and analgesic properties in pre-clinical models. Research by Kumar et al. (2014) demonstrated that ethanolic extracts of Ci Xian Cai significantly reduced carrageenan-induced paw edema and exhibited analgesic effects in the hot plate and acetic acid writhing tests in animal models (PMID: 24991118). The study attributed these effects to the presence of flavonoids and betacyanins. Ongoiba et al. (2022) investigated the anti-inflammatory mechanisms and found that the leaf extract inhibited the production of nitric oxide and pro-inflammatory cytokines in LPS-stimulated macrophages (PMID: 35368124). These findings provide mechanistic insights but do not establish clinical efficacy in humans.

Antimicrobial and antiparasitic activity: The extracts of A. spinosus have been investigated for their antimicrobial properties. Islam et al. (2018) reported that methanolic extracts of the leaves showed inhibitory activity against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Candida albicans in disk diffusion assays (PMID: 30221041). Sahoo et al. (2020) demonstrated that the leaf extract exhibited anthelmintic activity against intestinal parasites in animal models (PMID: 32285417). These antimicrobial findings are based on in-vitro and animal studies and their clinical relevance for human infections has not been established.

Antioxidant and hepatoprotective effects: The betacyanin and flavonoid fractions of Ci Xian Cai have been studied for their antioxidant capacity. Zakaria et al. (2020) demonstrated that the ethanolic extract of A. spinosusleaves possessed strong free radical scavenging activity in DPPH and FRAP assays, with activity correlated to the betacyanin content (PMID: 32516508). Nwinuka et al. (2019) investigated the hepatoprotective potential of the leaf extract in a carbon tetrachloride-induced liver injury model and found that pretreatment significantly reduced serum transaminase levels and hepatic oxidative stress markers (PMID: 31258604). These findings are mechanistically interesting but are derived from animal and in-vitro models and should not be extrapolated to clinical applications.

Anti-diabetic and metabolic effects: Traditional use of Ci Xian Cai in diabetes management has been investigated in modern research. Adeyemi et al. (2021) studied the effect of A. spinosus leaf extract on streptozotocin-induced diabetic animal models and found that it significantly reduced fasting blood glucose levels and improved glucose tolerance (PMID: 34335862). The researchers attributed this effect to the presence of flavonoids and polyphenols that may enhance insulin sensitivity and inhibit alpha-glucosidase activity. Hossain et al. (2022) demonstrated that the extract improved lipid profiles in hyperlipidemic animal models (PMID: 35621348). These pre-clinical studies are interesting but do not constitute evidence for clinical efficacy in human diabetes or metabolic disorders.

What the research does NOT show: Despite promising pre-clinical signals, the research on Ci Xian Cai and its active compounds does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. There is no robust evidence from large-scale, randomized, placebo-controlled clinical trials that Ci Xian Cai can treat, cure, or prevent infectious diseases, inflammatory disorders, diabetes, or any other medical condition. The translation from animal models to human clinical relevance is uncertain. This page does not endorse Ci Xian Cai as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Ci Xian Cai is widely consumed as a food in many cultures and is generally considered safe in dietary amounts. However, its medicinal use at higher doses or in concentrated preparations requires caution. Like all herbal products, it is not free of risk. The information below reflects what is currently known from published literature, traditional clinical experience, and pharmacological research.

Spleen-Stomach deficiency-cold: In traditional TCM theory, Ci Xian Cai is cool in nature. Individuals with Spleen-Stomach deficiency-cold — characterized by poor appetite, loose stools, abdominal coldness, and a pale tongue with white coating — should use Ci Xian Cai with caution, as its cool nature may further weaken digestive function and exacerbate cold symptoms. This is a traditional TCM consideration rather than modern clinical evidence.

Yang deficiency: Ci Xian Cai should be used with caution in individuals with Yang deficiency patterns — characterized by cold limbs, aversion to cold, loose stools, and a pale, swollen tongue. Its cool nature may further damage Yang Qi and worsen cold symptoms. In traditional practice, it is generally combined with warming herbs when necessary for Yang-deficient patients with concurrent Heat patterns. This is a traditional TCM consideration and is not based on modern clinical data.

Oxalate content and kidney stones: Ci Xian Cai contains significant amounts of oxalates, particularly in mature leaves. Individuals with a history of calcium oxalate kidney stones or hyperoxaluria should exercise caution when consuming large amounts of this herb, especially in concentrated preparations. The oxalate content can be partially reduced by boiling and discarding the cooking water, a traditional preparation method that is recommended for individuals concerned about oxalate intake. Those with impaired kidney function should consult a healthcare provider before using this herb.

Pregnancy and lactation: While Ci Xian Cai is consumed as a food in many cultures, its medicinal use during pregnancy should be approached with caution. In traditional TCM practice, herbs that cool Blood or have strong Heat-clearing properties are generally used carefully during pregnancy. Self-administration of concentrated Ci Xian Cai preparations during pregnancy is not recommended. It should only be used during pregnancy under the direct supervision of a qualified healthcare professional. There is limited information regarding its safety during lactation.

Drug interactions: Pre-clinical data suggest that certain constituents in Ci Xian Cai, including flavonoids and saponins, may affect hepatic cytochrome P450 enzyme activity, which could theoretically alter the metabolism of drugs processed through these pathways. The high vitamin K content may theoretically interact with anticoagulant medications such as warfarin. The oxalate content may affect calcium absorption and interact with calcium supplements. Clinical interaction data for whole-herb Ci Xian Cai are very limited. Consult a qualified healthcare professional before combining Ci Xian Cai with any prescription medications.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Ci Xian Cai or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.