Ingredient Processed / Derived product (加工品 jiā gōng pǐn)

Bing Tang

Rock sugar · 冰糖

Saccharum sinense Roxb. · Saccharum Crystallidum

Also known as: Rock candy, Crystal sugar, Chinese rock sugar,

Bing Tang (Rock sugar) plant

Images shown are for educational purposes only

Rock sugar is a gentle, sweet ingredient widely used in Chinese medicine food therapy to moisten the Lungs, soothe coughs, and support digestion. It is most famously paired with pear and Chuan Bei Mu (Fritillaria) for dry coughs and sore throats. Because of its neutral temperature, it suits most body types when used in moderation.

Category Qi-tonifying herbs (补气药)
Therapeutic focus Respiratory Health Digestive Health Throat Health Hydration and Thirst Relief

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels entered

Lungs, Spleen

Parts used

Processed / Derived product (加工品 jiā gōng pǐn)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Bing Tang does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Bing Tang is primarily used to support these areas of health:

Respiratory Health Digestive Health Throat Health Hydration and Thirst Relief

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Bing Tang performs to restore balance in the body:

Tonifies the Middle and Augments Qi Harmonizes the Stomach and moistens the Lungs Moistens the Lungs and Stops Cough Resolves Phlegm Nourishes Yin and Generates Fluids

How these actions work

'Tonifies the middle and boosts Qi' means Bing Tang gently supports the Spleen and Stomach, the organs responsible for digestion and producing Qi. Its sweet flavor naturally nourishes these organs, making it helpful for people with mild digestive weakness, poor appetite, or general fatigue. It is often used as a gentle supplementary ingredient rather than a primary therapeutic herb.

'Harmonizes the Stomach and moistens the Lungs' describes two related actions. The sweet, neutral nature of rock sugar soothes the Stomach lining and makes herbal formulas easier to tolerate, while its moistening quality benefits the Lungs. This is why rock sugar is so frequently paired with pear and Chuan Bei Mu (Fritillaria) for dry coughs. Unlike regular white sugar, which TCM considers more likely to produce Dampness, rock sugar is regarded as gentler and less likely to cause phlegm.

'Moistens the Lungs and stops cough' applies specifically to dry, unproductive coughs caused by Lung dryness. Bing Tang generates fluids that moisten the respiratory tract, relieving dry throat and ticklish cough. It is not appropriate for coughs with copious phlegm or those caused by Cold, as its sweet, moistening nature could worsen those conditions.

'Nourishes Yin and generates fluids' refers to its ability to replenish the body's moistening substances. This makes it useful during dry autumn and winter weather, or whenever there is dry mouth, dry throat, or mild thirst from fluid depletion.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Bing Tang is used to help correct these specific patterns.

Why Bing Tang addresses this pattern

Lung Dryness arises when the Lungs lack sufficient fluids to keep the airways moist, often due to dry weather, prolonged illness, or constitutional Yin Deficiency. Bing Tang's sweet flavor and neutral temperature gently generate fluids and moisten the Lungs without introducing excess Cold or Heat. By entering the Lung channel directly, it replenishes the moisture needed to soothe irritated airways, relieve dry cough, and ease scratchy throat. It is particularly effective when combined with other Lung-moistening substances like pear or Chuan Bei Mu.

A practitioner would look for one or more of these signs

Dry Cough

Dry, unproductive cough with little or no phlegm

Sore Throat

Dry, scratchy, or irritated throat

Thirst

Dry mouth and thirst

Commonly Used For

These are conditions where Bing Tang is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Lung Dryness

TCM Interpretation

In TCM, a persistent dry cough with little or no phlegm typically points to a lack of moisture in the Lungs. The Lungs are considered a 'delicate organ' that depends on adequate fluids to function smoothly. When dryness sets in, whether from seasonal dry weather, indoor heating, prolonged illness, or a naturally Yin-deficient constitution, the Lungs become irritated. This produces a ticklish, hacking cough that feels worse at night or in dry environments. The key pathological factor is insufficient Lung Yin and fluids, not the presence of an external pathogen.

Why Bing Tang Helps

Bing Tang enters the Lung channel and has a sweet, moistening quality that directly replenishes the fluids the dry Lungs are lacking. Its neutral temperature means it will not introduce unwanted Cold (which could worsen a cold-pattern cough) or Heat. When steamed with pear or combined with Chuan Bei Mu (Fritillaria), the moistening effect is amplified, creating a classic home remedy for autumn and winter dryness coughs. Rock sugar also serves a practical role in these preparations: it harmonizes the bitter taste of medicinal herbs, making the remedy palatable while contributing its own therapeutic moistening action.

Also commonly used for

Poor Appetite

Mild appetite loss related to Spleen Qi weakness

Bronchitis

Used as a supportive ingredient in food therapy for chronic bronchitis with dry cough

Corneal Ulcers

Classical usage for mouth sores (口疮), mentioned in historical texts

Dysentery

Classical usage with Wu Mei (mume fruit) for dysentery with inability to eat

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels Entered

Lungs Spleen

Parts Used

Processed / Derived product (加工品 jiā gōng pǐn)

Dosage & Preparation

These are general dosage guidelines for Bing Tang — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

10-15g (in decoction or dissolved in liquid)

Maximum dosage

Up to 30g per dose in dietary therapy preparations; no strict toxic upper limit, but intake should be moderated to avoid excessive sugar consumption and its metabolic consequences.

Dosage notes

Use lower doses (10-15g) when adding to medicinal decoctions as a flavour corrector or mild Lung-moistening adjuvant. Higher doses (15-30g) are used in dietary therapy preparations like stewed pear, tremella soup, or bird's nest. In medicinal paste (膏方) preparation, approximately 500g is used as a base for a full course. For people who are overweight, have blood sugar concerns, or tend toward Dampness, keep doses to the minimum needed. Bing Tang can also be dissolved directly in the mouth for sore throat or dry cough relief.

Preparation

When used in decoctions, Bing Tang should be dissolved into the strained liquid (烊化, yang hua) near the end rather than being decocted with the other herbs from the start. This preserves its properties and prevents it from caramelising or making the decoction overly sticky. For dietary therapy, it is typically added to stews, soups, or steamed preparations (e.g. steamed pear) during the last few minutes of cooking. It can also be dissolved directly in warm water or slowly dissolved in the mouth.

Common Ingredient Pairs

These ingredients are traditionally combined with Bing Tang for enhanced therapeutic effect

Chuan Bei Mu
Chuan Bei Mu Chuan Bei Mu 3–5g : Bing Tang 10–20g

Bing Tang moistens the Lungs and generates fluids while Chuan Bei Mu clears Lung Heat and transforms phlegm. Together they create a powerful combination for dry cough: Chuan Bei Mu addresses the stuck, sticky phlegm and underlying Heat, while Bing Tang provides the moisture the Lungs need and softens the bitter taste of Chuan Bei Mu.

When to use: Dry cough with little or sticky phlegm, dry or irritated throat, Lung dryness cough in autumn and winter, or chronic cough from Lung Yin Deficiency.

Wu Mei
Wu Mei Wu Mei 1 piece : Bing Tang 15g

Wu Mei's sour, astringent nature restrains leakage and generates fluids, while Bing Tang's sweetness tonifies Qi and harmonizes the Stomach. The sour-sweet combination stimulates saliva production, settles the Stomach, and restores appetite. This is a classical pairing recorded in the Sui Xi Ju Yin Shi Pu for dysentery with inability to eat (噤口痢).

When to use: Dysentery or severe digestive upset with complete loss of appetite, dry mouth with thirst, or summer heat conditions with fluid depletion.

Yi
Yin Er Yin Er 10–15g : Bing Tang 15–30g

Yin Er (Tremella/white fungus) nourishes Yin and moistens the Lungs, while Bing Tang enhances the moistening effect and makes the preparation palatable. Together they deeply nourish Lung and Stomach Yin, addressing chronic dryness from the inside out.

When to use: Chronic dry skin, dry throat, dry cough, or general Yin Deficiency symptoms, especially in autumn when dryness predominates. Also commonly used for overall nourishment and skin health.

Xue Lian Hua
Xue Lian Hua Xue Li 1 whole pear : Bing Tang 15–20g

Pear (Xue Li) is cool and moistening, clearing Lung Heat and generating fluids. Bing Tang reinforces the moistening action while its neutral nature balances the coolness of pear, making the combination suitable for a wider range of people. This is the basis of the famous 'Bing Tang Xue Li' (rock sugar steamed pear) home remedy.

When to use: Dry cough from Lung dryness, mild sore throat, autumn dryness syndrome, or as a seasonal wellness food during dry weather.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Feng Mi
Bing Tang vs Feng Mi

Both Bing Tang and Feng Mi (honey) are sweet, moisten the Lungs, and stop cough. The key difference is that honey is slightly warm and has additional actions of moistening the Intestines to relieve constipation and detoxifying. Bing Tang is neutral and more focused on Lung moistening without the laxative effect. For dry cough without constipation, Bing Tang is preferred; when dry cough accompanies dry stools, honey may be more appropriate.

Yi Tang
Bing Tang vs Yi Tang

Both are sugar-based Qi tonics with sweet flavor that enter the Spleen. However, Yi Tang (maltose/malt sugar) is warm in temperature, making it better suited for Spleen and Stomach Cold with abdominal pain. Bing Tang is neutral and moistens the Lungs more effectively. Yi Tang is a key ingredient in warming formulas like Xiao Jian Zhong Tang, while Bing Tang is preferred in Lung-moistening food therapy.

Bing Tang
Bing Tang vs Bing Tang

Hong Tang (brown sugar/red sugar) is warm and enters the Liver and Spleen, with a focus on invigorating Blood and dispelling Cold. It is used for menstrual pain, postpartum recovery, and cold-type abdominal pain. Bing Tang is neutral, enters the Lung and Spleen, and moistens rather than warms. For respiratory dryness, Bing Tang is the clear choice; for cold-pattern gynecological conditions, Hong Tang is preferred.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Bing Tang

White granulated sugar (白砂糖) is sometimes used as a cheaper substitute, but it has a slightly different therapeutic profile in TCM, being considered less gentle for Lung-moistening purposes. Modern single-crystal rock sugar (单晶冰糖), introduced from Japan in the 1960s, is widely sold but was not the form used in classical Chinese medicine and may lack the same properties according to traditional practitioners. Some low-quality products may be bleached with sulphur dioxide to achieve a whiter appearance. Authentic traditional polycrystalline rock sugar (多晶体冰糖, also called old rock sugar 老冰糖) can be distinguished by its irregular, chunky shape and natural translucence, as opposed to the uniform square shape of single-crystal products.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Bing Tang

Non-toxic

Bing Tang is classified as non-toxic and is essentially pure sucrose in crystallized form. It poses no risk of poisoning at normal dietary or medicinal doses. The only health concerns relate to excessive long-term consumption: promoting dental caries, contributing to weight gain and metabolic problems, and potentially worsening Dampness conditions in TCM terms. Classical texts note that prolonged overconsumption can "promote Heat, damage the teeth, and breed parasites" (Li Shizhen). No special processing is needed to make it safe, unlike truly toxic herbs.

Contraindications

Situations where Bing Tang should not be used or requires extra caution

Avoid

Diabetes mellitus or hyperglycemia: Bing Tang is nearly pure sucrose (99.9% purity) and will directly raise blood glucose levels. People with diabetes or poorly controlled blood sugar should avoid it.

Caution

Phlegm-Dampness or Dampness-Heat patterns: The sweet, cloying nature of Bing Tang can generate Dampness and worsen phlegm accumulation. Classical sources note that those with phlegm-dampness in the Stomach may experience nausea, as "its sweet cloying nature clings to the diaphragm."

Caution

Obesity or metabolic syndrome: Excessive sugar consumption contributes to weight gain, insulin resistance, and metabolic dysfunction. Use sparingly or avoid in these individuals.

Caution

Cough with copious phlegm (productive cough): Bing Tang is appropriate for dry cough with scanty phlegm, but in cases of profuse, thick phlegm it can worsen phlegm production due to its sweet, Dampness-generating nature.

Caution

Dental caries or active oral disease in children: Prolonged exposure to dissolved sugar promotes tooth decay. Those prone to cavities should limit use and rinse the mouth after consumption.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe during pregnancy at standard culinary and medicinal doses. Bing Tang is neutral in thermal nature and has no known uterine-stimulating or teratogenic properties. However, pregnant women with gestational diabetes or impaired glucose tolerance should limit or avoid its use due to its high sucrose content. It can be used as a gentle flavour corrector in medicinal preparations during pregnancy.

Breastfeeding

Considered safe during breastfeeding at normal dietary and medicinal doses. Sucrose is a common dietary component and does not pose specific risks through breast milk transfer. Bing Tang is commonly used postpartum in Chinese dietary therapy, often combined with ingredients like bird's nest or tremella mushroom for nourishment. Mothers with diabetes or blood sugar concerns should still limit intake.

Children

Bing Tang is commonly used in children's dietary therapy for dry cough, such as in the classic preparation of rock sugar stewed with pear (冰糖雪梨). Classical sources specifically mention its use for children with prolonged malaria who cannot yet eat solid food. Dosage should be reduced proportionally for age, typically 3-5g for young children. However, regular or excessive use should be avoided to prevent dental caries, excess sugar intake, and the development of overly sweet taste preferences. Not suitable for infants under 1 year as a general precaution regarding added sugars.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Bing Tang

As a nearly pure sucrose product, Bing Tang has no complex phytochemical profile and therefore no specific herb-drug interactions in the pharmacological sense. However, the following considerations apply:

  • Diabetes medications (insulin, metformin, sulfonylureas, etc.): Bing Tang will directly raise blood glucose and can counteract the effects of hypoglycaemic agents. People on diabetes medications should avoid medicinal use of Bing Tang or adjust their blood sugar management accordingly.
  • Medications requiring stable blood glucose: Any medication whose efficacy depends on stable glycaemic control may be affected by significant sucrose intake.

No other clinically significant drug interactions have been documented for pure crystallised sucrose.

Dietary Advice

Foods and dietary considerations when taking Bing Tang

When using Bing Tang for its Lung-moistening and cough-relieving effects, pair it with cooling, moistening foods such as pear, tremella (snow fungus), lily bulb (bai he), or loquat. Avoid concurrent intake of greasy, heavy, or strongly spicy foods, which can generate more Dampness or Heat and counteract the gentle moistening effect. People with a tendency toward Spleen deficiency with Dampness (characterised by loose stools, bloating, heavy limbs) should be cautious with sweet foods in general and keep Bing Tang use minimal. Avoid combining with large amounts of cold, raw foods if the Spleen and Stomach are already weak.

Botanical Description

Physical characteristics and morphology of the Bing Tang source source material

Bing Tang (冰糖, Rock Sugar / Crystal Sugar) is not derived from a single plant organ in the usual sense of herbal medicine. It is a processed crystalline product made from the juice of sugarcane, Saccharum sinense Roxb. (also classified as Saccharum officinarum), a tall perennial grass of the family Poaceae (Gramineae).

Sugarcane grows 3 to 6 metres tall with thick, jointed, fibrous stalks that are rich in sucrose-laden juice. The stems are upright, green to purple in colour, and segmented by prominent nodes. The leaves are long, narrow, and blade-like, arranged alternately along the stem. When mature, the plant produces a feathery, plume-like inflorescence (panicle) at the top. Sugarcane thrives in tropical and subtropical climates with abundant sunshine, warm temperatures, and adequate rainfall, and is widely cultivated across southern China.

To produce Bing Tang, sugarcane juice is extracted, refined into white granulated sugar, then dissolved in water, clarified, heated to around 115–120°C, and poured into crystallization vessels. Over a period of 7 to 9 days under carefully controlled temperature and humidity, large, transparent or semi-transparent crystals form. The traditional polycrystalline (multi-crystal) form, produced by this slow natural crystallization, is the type recognised in classical Chinese medicine.

Sourcing & Harvesting

Where Bing Tang is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Sugarcane is typically harvested in late autumn through winter (October to March), when sucrose content in the stalks is at its peak. Rock sugar is then produced year-round from refined white sugar through a controlled crystallization process taking 7 to 9 days.

Primary growing regions

Bing Tang is a processed product of sugarcane (Saccharum sinense). Sugarcane is cultivated across southern China, with the primary producing regions being Guangxi, Yunnan, and Guangdong provinces, which together account for over 90% of China's sugarcane output. Guangxi alone produces roughly 60% of the national total and is considered the heartland of Chinese sugar production. Hainan, Fujian, and Sichuan are secondary producing areas. Historically, Guangdong and Fujian were the dominant sugar-producing regions from the Ming and Qing dynasties onward. The traditional polycrystalline rock sugar prized in Chinese medicine has long been associated with artisanal production in southern China, particularly Guangdong (Kwangtung).

Quality indicators

High-quality Bing Tang should be in the traditional polycrystalline (multi-crystal, 多晶体) form rather than the modern single-crystal form, as the polycrystalline variety is produced through the classical high-temperature process and slow natural crystallization that Chinese medicine considers authentic. Good quality crystals are large, hard, translucent, and slightly irregular in shape. White rock sugar should be clear and glassy; yellow rock sugar (黄冰糖), made from subsequent crystallization rounds, retains slightly more minerals and a faint golden hue and is often preferred for medicinal stewing and soups. The crystals should be dry, free of surface moisture or stickiness, and dissolve cleanly in water without residue or off-flavours. Avoid rock sugar that appears cloudy, overly powdery, or has an unusual chemical smell, which may indicate adulteration or poor processing.

Classical Texts

Key passages from the classical Chinese medical texts that describe Bing Tang and its therapeutic uses

《本草再新》 Ben Cao Zai Xin

Original: 补中益气，和胃润肺，止咳嗽，化痰涎。

Translation: Supplements the centre and boosts Qi, harmonises the Stomach and moistens the Lungs, stops coughing, and transforms phlegm.

《本经逢原》 Ben Jing Feng Yuan

Original: 世言糖性湿热，多食令人齿龋生疳。近见患口疳者，细嚼冰糖辄愈，取其达疳以磨湿热凝滞也。又暴得咳嗽，吐血乍止，以冰糖与燕窝菜同煮连服，取其平补肺胃，而无止截之患也。惟胃中有痰湿者，令人欲呕，以其甜腻恋膈故也。

Translation: It is commonly said that sugar is damp-hot in nature and that excessive consumption causes tooth decay and oral sores. Yet recently, patients with mouth sores who slowly chewed rock sugar were promptly cured, because it can reach the sores and dissolve damp-heat stagnation. Also, for sudden onset coughing where blood-streaked sputum has just stopped, cooking rock sugar with bird's nest and consuming it continuously will gently tonify the Lung and Stomach without the risk of abruptly stopping [the pathological process]. However, for those with phlegm-dampness in the Stomach, it can cause nausea, because its sweet cloying nature clings to the diaphragm.

《本草纲目》 Ben Cao Gang Mu — Li Shizhen

Original: 石蜜、糖霜、冰糖，比之紫沙糖性稍平，功用相同，入药胜之。然不冷利，若久食则助热，损齿、生虫之害同也。

Translation: Rock honey, sugar frost, and rock sugar are slightly more neutral in nature compared to brown sugar, and share the same functions, but are superior for use in medicinal preparations. However, they are not cooling or draining. If consumed over a long period, they can promote Heat, damage the teeth, and breed parasites — the same harms [as other sugars].

《中华本草》 Zhong Hua Ben Cao

Original: 健脾和胃；润肺止咳。主脾胃气虚；肺燥咳嗽；或痰中带血。

Translation: Strengthens the Spleen and harmonises the Stomach; moistens the Lung and stops coughing. Indicated for Spleen-Stomach Qi deficiency, Lung dryness cough, or blood-streaked phlegm.

Historical Context

The history and evolution of Bing Tang's use in Chinese medicine over the centuries

The origins of rock sugar in China trace back to the Tang Dynasty (618–907 CE). According to Song Dynasty historian Wang Zhuo, a Buddhist monk in Sichuan province during the Dali era (766–779 CE) discovered that boiling sugarcane juice into a thick syrup and allowing it to slowly crystallize in ceramic urns produced hard, translucent formations resembling chunks of ice. Through the Song Dynasty, these crystals were known as "sugar frost" (糖霜) or "sugar ice." The name "rock sugar" (冰糖, literally "ice sugar") became standard only during the Ming Dynasty, when granulated sugar rose to wider popularity and a clear distinction was needed.

The broader technology of sugar refining in China was influenced by knowledge exchange with India. Emperor Taizong of the Tang Dynasty (r. 626–649) sent envoys to India in 647 CE to learn advanced sugar-refining techniques. Li Shizhen's Ben Cao Gang Mu (1578) notes: "The sugar-making method came from the Western Regions; Tang Taizong first sent people to transmit this method into China." Over time, Chinese craftsmen refined these techniques until their products surpassed the originals in quality.

In Chinese medicine, Bing Tang has primarily been valued as a gentle, neutral-natured adjuvant rather than a primary therapeutic agent. It is widely used to moderate the flavour of bitter medicinal decoctions, to serve as a base in medicinal pastes (膏方, gao fang), and as a key ingredient in dietary therapy recipes such as the famous "rock sugar stewed pear" (冰糖雪梨) for dry cough. The Ben Cao Gang Mu considered rock sugar superior to other sugars for medicinal use due to its more neutral nature and higher purity.