Alternate Title

  • Laetrile

Related Terms

  • Aci badem, almendra amara, amande amere, amendoa amarga, amygdala amara, Amygdalis dulcis amara, bitter almond oil, bittere amandel, bittermandel, gorkiy mindal, karvasmanteli, keseru mandula, ku wei bian tao, ku xing ren, lawz murr, mandorla amara, Prunus amygalus amara, Prunus communis amara, Prunus dulcis (Mill.) D.A. Webb var. amara (DC.) H.E. Moore, Rosaceae (family), volatile almond oil.
  • Note: Bitter almond should not be confused with “sweet almond.” Sweet almond seeds do not contain amygdalin and can be eaten, whereas bitter almonds can be toxic.

Background

    Evidence Table

      Disclaimer

      These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.

      C – C


      D – D

    *Key to grades:

    Tradition

      Disclaimer

      The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.

    Dosing

      Disclaimer

      The below doses are based on scientific research, publications, traditional use, or expert opinion. Many herbs and supplements have not been thoroughly tested, and safety and effectiveness may not be proven. Brands may be made differently, with variable ingredients, even within the same brand. The below doses may not apply to all products. You should read product labels, and discuss doses with a qualified healthcare provider before starting therapy.

    • Adults (18 years and older)

      • Due to potential toxicity, there is no widely accepted standard dose for bitter almond.
    • Children (younger than 18 years)

      • Due to potential toxicity, bitter almond products should be avoided in children.

    Safety

      Disclaimer

      The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.

    • Allergies

      • Allergies to almonds are common and have lead to severe reactions, including throat swelling that interferes with breathing. If allergic to other nuts, it is probably best to avoid almonds.
    • Side Effects and Warnings

      • Laetrile, derived from the amygdalin found in the pits of fruits and nuts such as the bitter almond, is considered unsafe in any form due to its potential for causing cyanide toxicity. Reactions are more severe when laetrile is taken by mouth than when injected into a vein or muscle. Some of the side effects have included dilated pupils, dizziness, drooping eyelids, drowsiness, headache, increased breathing, muscle weakness, nausea, stomach pain, and vomiting. High doses of bitter almond or laetrile may lead to a slowing of brain functions or breathing. Several cases of cyanide poisoning (some fatal) have been reported.
      • Drowsiness or sedation may occur with bitter almond. Use cautiously if driving or operating heavy machinery.
    • Pregnancy and Breastfeeding

      • Bitter almonds are not recommended in pregnant or breastfeeding women due to insufficient available data and potential risk for birth defects.

    Interactions

      Disclaimer

      Most herbs and supplements have not been thoroughly tested for interactions with other herbs, supplements, drugs, or foods. The interactions listed below are based on reports in scientific publications, laboratory experiments, or traditional use. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy.

    • Interactions with Drugs

      • In theory, bitter almond may increase the amount of drowsiness caused by some drugs. Examples include benzodiazepines such as lorazepam (Ativan®) or diazepam (Valium®), barbiturates such as phenobarbital, narcotics such as codeine, some antidepressants, and alcohol. Caution is advised while driving or operating machinery. Avoid the use of alcohol as almond oil was shown in mice to cause a toxic reaction (nausea, vomiting, increased breathing, sweating) when taken with alcohol.
      • Amygdalin, bitter almond, and laetrile may also interact with analgesics (pain-relievers), central nervous system (CNS) depressants, agents that suppress or stimulate the immune system, and agents that are excreted through the kidneys. However, human evidence is lacking.
    • Interactions with Herbs and Dietary Supplements

      • Bitter almond may increase the amount of drowsiness caused by some herbs or supplements. Caution is advised while driving or operating machinery.
      • Amygdalin, bitter almond, and laetrile may also interact with analgesics (pain-relievers), central nervous system (CNS) depressants, agents that suppress or stimulate the immune system, and agents that are excreted through the kidneys. However, human evidence is lacking.

    Attribution

    • This information is based on a systematic review of scientific literature edited and peer-reviewed by contributors to the Natural Standard Research Collaboration ().

    Bibliography

      Disclaimer

      Natural Standard developed the above evidence-based information based on a thorough systematic review of the available scientific articles. For comprehensive information about alternative and complementary therapies on the professional level, go to . Selected references are listed below.

    • Araya E, Rodriguez A, Rubio J, et al. Synthesis and evaluation of diverse analogs of amygdalin as potential peptidomimetics of peptide T. Bioorg Med Chem Lett 2005 Mar 1;15(5):1493-6.
      View Abstract
    • Beamer WC, Shealy RM, Prough DS. Acute cyanide poisoning from laetrile ingestion. Ann Emerg Med 1983;12(7):449-451.
      View Abstract
    • Chan TY. A probable case of amygdalin-induced peripheral neuropathy in a vegetarian with vitamin B12 deficiency. Ther Drug Monit 2006;28(1):140-141.
      View Abstract
    • Chang LW, Zhu HP, Li WB, et al. [Protective effects of amygdalin on hyperoxia-exposed type II alveolar epithelial cells isolated from premature rat lungs in vitro]. Zhonghua Er Ke Za Zhi 2005 Feb;43(2):118-23.
      View Abstract
    • Gill JR, Marker E, Stajic M. Suicide by cyanide: 17 deaths. Journal of Forensic Sciences. 2004 Jul;49(4):826-8.
      View Abstract
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    • Liegner KB, Beck EM, Rosenberg A. Laetrile-induced agranulocytosis. JAMA 1981 Dec 18;246(24):2841-2842.
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    • Moertel CG, Fleming TR, Rubin J, et al. A clinical trial of amygdalin (Laetrile) in the treatment of human cancer. N.Engl.J.Med. 1982 Jan 28;306(4):201-206.
      View Abstract
    • Moss RW. Patient perspectives: Tijuana cancer clinics in the post-NAFTA era. Integr Cancer Ther 2005 Mar;4(1):65-86.
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    • Shragg TA, Albertson TE, Fisher CJ, Jr. Cyanide poisoning after bitter almond ingestion. West J Med 1982;136(1):65-69.
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    • Vickers A. Alternative cancer cures: “unproven” or “disproven”? CA Cancer J Clin 2004 Mar-Apr;54(2):110-8.
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    • Vickers AJ, Kuo J, Cassileth BR. Unconventional anticancer agents: a systematic review of clinical trials. J Clin Oncol 1-1-2006;24(1):136-140.
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    • Willhite CC. Congenital malformations induced by laetrile. Science 1982 March 19;215(4539):1513-1515.
      View Abstract
    • Zhu H, Chang L, Li W, et al. Effect of amygdalin on the proliferation of hyperoxia-exposed type II alveolar epithelial cells isolated from premature rat. J Huazhong Univ Sci Technolog Med Sci. 2004;24(3):223-5.
      View Abstract