Bitter Apricot Seed
Important Disclaimer
This is not medical advice. Consult a qualified healthcare provider before using any remedy, especially if pregnant, breastfeeding, on medication, or managing a health condition.
Overview
Bitter apricot seeds are the inner kernels of apricot pits, distinct from sweet apricot kernels and almonds. They contain amygdalin (sometimes marketed as 'vitamin B17' or laetrile), which releases small amounts of hydrogen cyanide during digestion. In Traditional Chinese Medicine, they are a classical respiratory remedy used for thousands of years for coughs, asthma, and constipation. IMPORTANT SAFETY NOTE: Bitter apricot seeds contain cyanogenic glycosides and must only be used in small, controlled amounts. Excessive consumption is toxic and potentially fatal. Their use as an anti-cancer supplement is NOT supported by evidence and is dangerous.
Traditional Use
Bitter apricot seeds (Xing Ren or Ku Xing Ren) have been used in Traditional Chinese Medicine for over 2,000 years. They are listed in the Shennong Bencao Jing (the foundational TCM herbal classic) and remain one of the most commonly prescribed TCM herbs for respiratory conditions. In TCM, Ku Xing Ren (bitter apricot kernel) is classified as warm, bitter, and mildly toxic — primarily entering the Lung and Large Intestine meridians. The classical indications are cough with phlegm, dyspnea, asthma, constipation, and dry skin conditions. In TCM formulas, they are always cooked (decocted), which destroys some of the cyanogenic compounds and reduces toxicity. Used in formulas like Ma Xing Shi Gan Tang (for cough and asthma), Xing Su San (for cold-wind cough), and Ma Zi Ren Wan (for constipation). In Middle Eastern and Mediterranean traditional medicine, apricot oil from the kernels was used topically for skin care. In European herbal medicine, the outer bitter almond was used similarly. In Ayurveda, the seeds are occasionally used in small amounts for respiratory conditions.
Key Active Compounds
Amygdalin
CAUTION: A cyanogenic glycoside that is metabolized to release hydrogen cyanide (prussic acid) in the gut. Responsible for both the medicinal effects and the toxicity risk. Quantity must be strictly limited.
Prunasin
Another cyanogenic glycoside contributing to the overall amygdalin content and cyanide release potential.
Amygdalin Hydrolase (Enzyme)
Present in the seed along with amygdalin; when the seed is crushed and moistened, this enzyme rapidly converts amygdalin to hydrogen cyanide — making raw ground seeds significantly more toxic than whole or cooked seeds.
Fatty Acids (Apricot Kernel Oil)
The seed is ~45% oil, rich in oleic and linoleic acids. The cold-pressed oil (which contains no amygdalin) is used for skin care and is safe for topical use.
Evidence-Based Benefits
Respiratory Support and Cough Relief
Moderate evidenceMultiple clinical studies (primarily from China) and extensive TCM evidence support bitter apricot kernel as an effective antitussive and expectorant. The compounds relax bronchial smooth muscle and reduce the cough reflex. Used in decoctions for productive and dry coughs.
Constipation Relief
TraditionalThe high oil content and compounds lubricate the intestines and have a mild laxative effect. TCM formulas for constipation frequently include Xing Ren. Particularly effective for dry constipation in elderly patients.
Anti-asthmatic
Some studiesClinical studies from TCM hospitals show benefit in asthma management when used in proper formulas (always decocted, never raw). Thought to reduce bronchospasm and soothe irritated airways.
Topical Skin Care (Kernel Oil)
TraditionalCold-pressed apricot kernel oil (amygdalin-free) is widely used for skin moisturizing, eczema, and dry skin conditions. The oil is perfectly safe and effective topically.
Common Preparation Methods
TCM Decoction (Traditional — Supervised)
Use 3–9g of raw bitter apricot kernels (Ku Xing Ren) in a full decoction with other herbs. Simmer for 20–30 minutes. Strain and drink.
Dosage: 3–9 grams in decoction, as directed by TCM practitionerMUST be used under guidance of qualified TCM practitioner. Cooking significantly reduces cyanide content. Never take raw in these amounts. Standard component of many TCM respiratory formulas.
Limited Whole Seed Consumption
Whole, unchewed seeds (not crushed or ground) release less cyanide. In some traditional contexts, 3–5 whole seeds are used.
Dosage: Maximum 3 small seeds daily for adults — STRICT LIMITCAUTION: Even 10 small bitter apricot seeds can cause cyanide toxicity in adults. Children are at greater risk. Do not crush or grind seeds. Do not exceed stated dose. Not recommended outside of TCM supervision.
Apricot Kernel Oil (Topical — Safe)
Apply cold-pressed apricot kernel oil directly to skin or use as a massage or carrier oil.
Dosage: Apply as needed to skinSAFE topical use — oil contains negligible amygdalin. Excellent emollient and skin-nourishing oil. Suitable for face, body, dry skin conditions, and eczema.
Safety & Cautions
Please read carefully before use
Contraindications
- Children — much higher risk of cyanide toxicity; avoid entirely
- Pregnancy and breastfeeding — avoid medicinal doses
- ANY use of large amounts — cyanide poisoning is a real risk
- Do not use as a cancer treatment — no evidence and real toxicity risk
- Do not crush or grind seeds before eating
Drug Interactions
- No significant drug interactions at very low doses
- May interact with medications metabolized by the liver at higher doses due to cyanide metabolites
Possible Side Effects
- CYANIDE TOXICITY with excessive use: headache, dizziness, nausea, vomiting, rapid heart rate, confusion, seizures, death
- The lethal dose for adults is approximately 0.5–3.5mg HCN/kg body weight
- Small amounts (3–5 whole seeds) are generally tolerated by healthy adults
- Children are significantly more sensitive
Special Populations
- NEVER give to children
- NEVER use crushed or powdered bitter apricot seeds
- The topical kernel oil is completely safe for everyone
- TCM use is only safe within traditional formulas under professional supervision
- The Western marketing of bitter apricot seeds as 'vitamin B17' or cancer treatment is not evidence-based and is genuinely dangerous
- Emergency: If poisoning suspected, call Poison Control immediately
Sources & References
Food and Chemical Toxicology
Journal of Ethnopharmacology
European Food Safety Authority (EFSA)
Quick Reference
Rosaceae
Seed kernel (inner pit)
Distinctly bitter, slightly nutty, almond-like aroma
Safety First
Always consult with a qualified healthcare provider before starting any new remedy, especially if you have existing health conditions or take medications.