Skin profile
Where this herb sits in skin practice: the pattern it corrects, the skin signs it suits, and what it should not be used for.
Xing Ren treats dry, itchy, scaling skin that comes with a dry chest, and its oil is the safe part for the surface. The seed is a cyanogenic medicine: processed kernel, measured dose, short course, and never the raw kernel as a food.
Skin signs that suggest it
- Dry, rough, finely scaling skin with a dry cough and a dry stool
- An itchy face or scalp that worsens in dry, cold weather and eases in humidity
- Cracked, fissured skin on the hands, heels or lips that feels tight after washing
- A rash that lingers with a stuffy or dry chest, in a person who is not clearly hot or cold
- A thin, dry tongue coat and a pulse that is fine or tight
When it is not the right herb
Not for wet, oozing, infected or purulent skin, and not for a hot, red, spreading eruption, where a warm oily seed has nothing to offer. It is not for an infant or a young child except under a practitioner's direction, since children detoxify cyanide badly and the gap between a helpful and a harmful amount is small. It is not for loose stools or diarrhoea, because oil that eases a dry bowel makes a loose one looser still. Most importantly, raw or unprocessed kernels are never eaten and never used at home, whatever the indication.
What it does for skin
Skin-relevant actions only. Each one describes a mechanism in TCM terms and what it looks like on the skin.
Brings Lung Qi down so the surface settles
A dry, itchy, scaling skin that comes with a tight chest, a dry cough or a blocked nose is read as Lung Qi failing to move downward, so the surface loses its supply. The bitter seed is the standard descending herb, and it is used with cooling or with moistening herbs according to the rest of the picture. It supports a skin formula rather than treating the surface directly, and it is chosen when the chest and the skin are plainly telling the same story.
Moistens dryness with its own oil
The kernel is oily, and the tradition treats that oil as a medicine: it moistens the Lung and the bowel and, by extension, the surface the Lung supplies. A dry, cracked, tight skin with a dry throat and a dry stool is the picture, and the seed is used with moistening herbs such as ophiopogon and pear. It is gently moistening, so it suits a person in whom richer tonics would cloy, and it will not rebuild a truly depleted Yin.
Softens and protects skin externally through its oil
The fixed oil pressed from the kernel is a traditional emollient, used on dry, cracked and chapped skin and as a base for ointments, and the ground kernel has been applied as a paste to rough, thickened, scaly patches. This is the safest use of the herb, because the cyanogenic glycoside stays in the seed rather than the oil. It is not applied to broken, weeping or infected skin, and it is kept away from the eyes and from a child's reach.
Addresses sores and parasites in the old external practice
The old texts say the seed's toxicity was turned against sores and parasites, and ground kernel pastes were applied to scabies, tinea and stubborn ulcers. That use is recorded rather than recommended: the same toxicity is what makes the seed dangerous, modern scabicides and antifungals work, and an external paste should not go on broken skin or over a large area. It belongs in the history and in a practitioner's hands, not in a home remedy.
Skin conditions it is used for
Mapped to the condition pages on this site. The pattern column shows what the skin is doing when this herb is the right choice.
| Condition | Pattern | Why it suits | Typical setting |
|---|---|---|---|
| An itchy, dry face | Dry-wind: dry, scaly, itchy skin that worsens in dry weather | A face that itches, scales and feels tight, worse in dry cold weather and in heated rooms and better in humid air, is read as dryness with a little wind, and the classic formula for it is Sang Xing Tang, in which the kernel sits beside mulberry leaf and ophiopogon. The seed brings the Lung Qi down and supplies oil, so the surface is moistened from within. Itch with a new rash, with weight loss or night sweats, or that does not settle in a few weeks needs medical assessment. | Sang Xing Tang |
| Dry, rough skin | Lung dryness failing to moisten the skin | Dryness that shows on the surface and in the chest at once, with a dry throat, a dry cough and a dry stool, is read as the Lung failing to spread moisture. The kernel both brings the Qi down and adds oil, and it is used with moistening herbs rather than alone. It is a gentle measure for a mild, seasonal picture; generalised dry skin with heavy scaling, a family history of ichthyosis or a thyroid problem needs a diagnosis. | With Mai Dong, Bei Sha Shen and pear |
| Cracked, fissured skin | Dryness with loss of flexibility at the surface | Fissures on the heels, hands or lips are read as skin that has lost its moisture and its give, and the oil of the kernel is the form used here: applied thinly to intact, dry, chapped skin, it softens the surface and slows water loss. It is a supportive measure beside emollient cream and a barrier ointment, which have the better evidence. A fissure that bleeds, weeps or looks infected needs treatment rather than oil, and the seed itself is not applied to an open crack. | Kernel oil applied topically, with internal moistening herbs |
| Warm, heavy, damp skin | Damp-warmth with muffled heat and a heavy body | A low-grade warmth that feels heavy and damp, worse in humid weather, with a stuffy chest and a greasy tongue coat, is read as damp-warmth, and the kernel is used in San Ren Tang to move Qi and help the aromatic drying herbs work. Its role is to bring the Lung Qi down, not to cool the skin itself. A persistent fever with a rash needs assessment, and this pattern is treated in a formula rather than with a single seed. | San Ren Tang |
| Chickenpox | Lung heat with a vesicular rash and a cough | In the pattern where vesicles come with a cough, a stuffy chest and heat, the kernel brings the Lung Qi down while the cooling herbs clear the heat, as in Ma Xing Shi Gan Tang, and its job is the cough rather than the rash. Chickenpox in a child is usually mild and the rash is managed with cooling and drying measures. A high fever, drowsiness, difficulty breathing or a spreading infected rash needs medical care at once, and the seed is never given to an infant. | Ma Xing Shi Gan Tang |
Combinations for skin
Herbs it is paired with when the skin, not an internal organ, is the target.
| Partner | Ratio | Why the pair is used |
|---|---|---|
| Sang Ye | 9 g Sang Ye with 6 g Xing Ren | Mulberry leaf clears wind-heat and moistens the Lung, while the kernel brings the Qi down and adds oil. The pair is the core of Sang Xing Tang for dry-wind with a dry cough and dry, itchy skin, and the leaf works at the surface while the seed works below it, which is why they suit a dryness that has settled rather than one that has just arrived. |
| Mai Dong | 9 g of each | Ophiopogon nourishes Lung and Stomach Yin and holds fluid in, while the kernel's oil moistens and its bitterness descends. The pair is used for a dry throat, a dry cough and skin that is dry and tight after an illness, and the moistening herb is the larger influence of the two. |
| Chuan Bei Mu | 6 g of each | Fritillary moistens the Lung and transforms sticky phlegm, and the kernel lowers the Qi that is stuck behind it. The pair suits a cough that is dry or comes with Yin deficiency, with scant sticky sputum and a dry, rough skin, and it is gentler than the warming cough pairings. |
| Yi Yi Ren | 15 to 30 g Yi Yi Ren with 6 to 9 g Xing Ren | Job's tears drains dampness and the kernel moves Lung Qi, which is the structure of San Ren Tang for damp-warmth with a heavy, warm, clammy skin. The seed is the smallest ingredient and its job is direction rather than drying. |
| Huo Ma Ren | 9 g of each | Both moisten the bowel, but hemp seed is the richer oil and the kernel adds the downward pull of Lung Qi, so a dry stool with a dry chest is treated from above and below at once. It is the pair chosen when hard stools and dry skin occur together in the same depleted person, and both are given in short courses. |
Formulas where it leads
- Sang Xing Tang (桑杏汤) - The classical formula for warm-dryness attacking the Lung, with mulberry leaf, the apricot kernel, ophiopogon and fritillary. In skin practice it is the model for dry, itchy, scaling skin with a dry cough and a dry throat, where the surface is dry because the Lung is dry. It is a light, short course, and it is not used for a wet or a cold picture.
Topical use
The only skin preparation in common use is the fixed oil pressed from the kernel, a traditional emollient for dry, chapped and scaly skin and a base for ointments. The oil carries none of the cyanogenic glycoside, so it is the safe way to use the herb on the surface, and it is applied thinly to intact skin. Ground kernel pastes were used on sores and parasites in the past; they are not a home preparation, because the toxicity that was the point is also the hazard.
| Preparation | How and when it is used |
|---|---|
| Kernel oil | A few drops warmed in the palm and pressed onto dry, chapped skin after washing while the skin is still damp, once or twice daily. It is used on intact skin only, kept away from the eyes, and a patch test on the forearm for a day comes first. |
| Ointment base | Almond oil is a standard vehicle in pharmacy ointments. A herbal ointment containing it should be checked for its other ingredients and preservatives before use on inflamed skin, and it should come from a maker who lists them. |
Patch test and cautions
Do not apply oil or a kernel paste to broken, weeping, ulcerated or infected skin, and do not cover a treated area with an occlusive dressing. Keep the oil and any kernels away from children, because the hazard is the seed rather than the oil. Stop if the skin stings, reddens or itches more, and never use a homemade kernel paste.
Safety for skin use
What to check before recommending or using it, including the cautions that matter most for skin patients.
Do not use, or use with caution
- Raw or unprocessed kernels in any amount, and the kernel eaten as food. Amygdalin releases hydrogen cyanide, and a few dozen raw bitter kernels can deliver a lethal dose to an adult, with far fewer for a child.
- Infants and young children, except under a practitioner's direction at a reduced dose. A child clears cyanide slowly and the gap between a helpful and a harmful amount is small.
- Loose stools or diarrhoea from a weak Spleen: the oil that eases a dry bowel makes a loose one looser still.
- Wet, oozing, infected or hot spreading skin lesions, and pregnancy. A warm oily seed has no place in a hot wet eruption, and the cyanogenic risk argues against use in pregnancy.
Pregnancy and breastfeeding
Best avoided. The concern is the cyanogenic glycoside and an infant's poor capacity to clear cyanide, not a recorded malformation. If a practitioner does use it in pregnancy, the kernel must be fully processed, the amount reduced and the reason clear, and no stage of pregnancy has room for the raw kernel. The same reasoning applies to breastfeeding, where cyanide metabolites could in theory reach milk: a short course at the lowest useful amount is preferred, and the infant is watched for drowsiness or poor feeding.
Interactions
- Sedatives and opioid painkillers: the cough-settling effect depends on a slight damping of the breathing centre, so opioids, benzodiazepines and barbiturates could add to it. This is a concern at the upper end of the dose rather than at ordinary decoction amounts.
- Pharmaceutical cough suppressants: codeine and dextromethorphan act in the same direction, and the combined suppression of breathing may be more than either alone. Do not stack them without medical advice.
- Alcohol: additive central depression, and it also affects the rate at which the gut liberates cyanide from the glycoside. Avoid it while taking the kernel.
Allergy and patch testing
Apricot and almond allergy is the specific caution, and it can take the form of oral itching rather than a skin rash. A person who reacts to other stone fruit may react to the kernel or to its oil, and a topical oil should be patch tested for a day before use. A new rash while taking the seed should be assessed rather than assumed to be part of the original problem.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this herb.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Evidence
The classical record is quoted with its source. The modern note states the level of evidence plainly.
Classical record
Sweet and warm, it governs cough with Qi rising the wrong way, a rumbling throat and painful obstruction of the throat. It promotes the descent of Qi and was used in childbirth and lactation, for metal wounds and for cold in the Heart with the running piglet. It sits in the lower grade of medicines, where power and danger are acknowledged together.
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica), Han compilation - The earliest entry already names the cough and the descent, and the lower-grade placing signalled a useful substance that could also harm.
It can both scatter and descend, and therefore relaxes the flesh, disperses wind, lowers Qi, moistens dryness and breaks up accumulation. In formulas for injuries it is used, and its toxicity is turned against sores and parasites.
Ben Cao Gang Mu (Compendium of Materia Medica), Li Shizhen, 1578 - The Ming summary separates the two directions of the herb, and the line about sores and parasites is the basis for its old external use on the skin.
Li Dongyuan explained that the apricot kernel quiets wheezing because it treats Qi, while the peach kernel quiets mania because it treats Blood. Both move a constipated bowel, and the choice turns on whether the disorder lies in Qi or in Blood.
Li Gao on the apricot and peach kernels - The teaching that still decides which kernel is chosen when a dry bowel accompanies a dry chest.
Modern evidence
Evidence status
- The cyanogenic mechanism is established rather than theoretical: gut enzymes and bacteria hydrolyse amygdalin to hydrogen cyanide, which binds cytochrome oxidase and halts cellular respiration. Blanching, removing skin and tip, dry-frying and boiling all cut down what is liberated, which is why a processed kernel in a decoction carries a different risk from a handful of raw kernels.
- Recorded poisoning from eating raw kernels begins with headache, dizziness, nausea, palpitations and breathlessness, usually inside half an hour to two hours, and can progress to blue lips, convulsions and respiratory failure. No clinical trial of the kernel in dry skin or in any skin disease was identified.
- Regulatory status: the processed kernel is an accepted article in the Chinese Pharmacopoeia, classed as slightly toxic, with a narrow dose range. Amygdalin was marketed as a cancer cure under the name laetrile; controlled trials found no benefit and confirmed how dangerous the oral route is.
PubMed records
Selected real PubMed records for this herb's species or its constituents, chosen by species name and title relevance. They are references for the non-TCM discussion above, not proof that the herb treats any skin condition.
- Phytochemistry and pharmacology of Armeniacae semen Amarum: A review.. Journal of ethnopharmacology, 2023. PMID: 36806484 (pharmacology or review record).
- Armeniacae semen amarum: a review on its botany, phytochemistry, pharmacology, clinical application, toxicology and pharmacokinetics.. Frontiers in pharmacology, 2024. PMID: 38323080 (safety record).
Dose and forms
Skin-practice dosing and the preparations that suit skin complaints.
| Form | Dose and notes |
|---|---|
| Decoction of processed kernel | 3 to 10 g daily in a formula, with 6 to 9 g the usual range. Kernels are crushed before decoction so the oil is freed, and the bitter skin is blanched off or the kernel dry-fried. |
| Form | Blanched, skinless kernels or dry-fried kernels only. Whole kernels give up little, and the raw kernel is never used internally whatever its source. |
| Ceiling and course | Ten grams of the processed kernel is the ceiling, and a course runs two to four weeks with review. Stop at once if dizziness, nausea, headache or breathlessness appears. |
| Topical oil | A few drops of the pressed oil on intact dry skin once or twice daily. It is not applied to broken skin and is kept out of reach of children. |
The dose is small because of the chemistry, not the strength. Normal boiling at three to ten grams of processed kernel does not produce dangerous cyanide levels, but the raw seed, the unpeeled kernel and the double kernel have all caused poisoning, and a few dozen raw kernels can kill an adult. A course is short and tied to a formula, the processed form is used throughout, and anyone who becomes dizzy, nauseated, confused or short of breath after taking it needs medical help at once.
Citations and further reading
Only real sources are listed: the classical materia medica passages quoted above, and the source works behind the botanical and safety statements.
- Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica), Han compilation - classical entry summarised above, the original not quoted.
- Ben Cao Gang Mu (Compendium of Materia Medica), Li Shizhen, 1578 - classical entry summarised above, the original not quoted.
- Li Dongyuan on the apricot and peach kernels, as preserved in the later materia medica literature - teaching summarised above.
- Semen Armeniacae Amarum monograph: Pharmacopoeia of the People's Republic of China - accepted source, part, processing requirement and dose range.
- Modern evidence statement: based on published work on amygdalin, beta-glucosidase and hydrogen cyanide release, and on recorded poisoning and laetrile trial literature; no clinical trial in skin disease is presented as proof.
- Botanical description and identification: botanical literature on Prunus armeniaca and related Prunus species, Rosaceae.
Educational reference for qualified practitioners. This page is not medical advice, and skin conditions should be diagnosed by a clinician before treatment.