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What is Laetrile?

Laetrile is the patented drug made from the natural compound amygdalin, found in the seeds of many fruits, such as apricot, plum and peach pits, apple seeds, and quince, as well as in almonds. Laetrile is also known as Amigdalin B-17 or vitamin B17, although there is very little evidence it warrants classification as a vitamin.

According to G. Edward Griffin ( World without Cancer: The Story of Vitamin B17)
contains both Cyanide and Benzaldimide – both are released by Beta-Glucosidase which is found only in cancer cells. Plus, Rhodanese (an enzyme found in healthy cells) has the ability to neutralise the poisons that kills cancer cells.

Cyanide in it’s pure/gaseous form is dangerous, but when it is locked with a number of other components in a molecule it is safe. For example, Cyanocobalamin (vitamin 12) contains cyanide and we would die without it.

Laetrile Infusion therapy is available at Hyperthermia-Centre-Hannover

The following is from their website
Amygdalin-B17 is used in infusion therapies and in natural chemotherapies
Amygdalin, Laetrile or B17 is a natural substance, which can be found in apricot stones, but B17 is also present in stones from peaches, nectarines, cherries, plums or apples and is also present in buckwheat, broccoli, spinach, cauliflower or cashew nuts.

From a chemical point of view, B17 consistes of one molecule benzaldehyde (which is a painkiller) and one molecule hydrogen cyanide (cyanhydric acid).

Healthy cells are not affected by this process as they contain an enzyme called Rhodanese. The Rhodanese enzyme can convert cyanhydric acid (present within B17) into thiocyanate. Thiocyanate has positive effects on the organism as thiocyanate lowers the blood pressure and is a substance which the organism uses to produce the nerve nutrition B12. Benzaldehyde (present within B17) is transformed within healthy cells with the help of oxygen into the painkiller benzoic acid.

The characteristics of B17 lead to the conclusion that B17 can be seen as nutrition for healthy cells and a poison for cancer cells. As the therapy is adopted to the natural regulation of our metabolism, it can be seen as a “natural chemo therapy”.

Laetrile Infusion therapy is available at Oasis of Hope Hospital

The following is from their website:

Oasis of Hope uses amygdalin (Laetrile) to attack the tumor. The cyanide released by amygdalin is one of the best killers of malignant cells as well. Amygdalin has a double punch. It lowers cancers resistance to treatment and it releases cyanide to kill cancer cells directly.

Doctors at Oasis of Hope have experienced positive results with amygdalin. These results encourage us to continue offering laetrile to our patients. Laterile should be looked at as a therapy that can be combined with additional alternative cancer treatments and/or other antitumor agents. This is the appropriate future of amygdalin.

At Oasis of Hope, we do not use amygdalin as a stand-alone drug. We capitalize on its ability to make tumors more susceptible to other therapies. This is why we have a multifaceted program which includes: chemotherapy, lymphocyte treatment, Vitamin –C therapy, sodium bicarbonate, UV light irradiation, and ozone.

By sensitizing the cancer, we are able to avoid using aggressive therapies that can destroy the patient’s quality of life. It is time for physicians to consider how to use amygdalin in combination with conventional therapies at lower, non-aggressive dosages. Amygdalin, combined with vitamin C, can deplete glutathione and cysteine in tumor cells and make it possible to destroy the cancer with integrative cancer therapies.

If amygdalin can be so helpful, why aren’t more cancer treatment centers using it?

The first argument is that it can be toxic because it contains cyanide. The second argument is that it doesn’t work.

Let’s talk about amygdalin’s toxicity first.

Oasis of Hope has used amygdalin as a cancer treatment with tens of thousands of patients since the early 1960s…continue reading at Oasis of Hope Hospital

Scientific evidence

Study: A pharmacologic and toxicological study of amygdalin.
… It is appropriate that patients taking laetrile be warned of the possible hazard of cyanide toxic reaction. They should be urged to use only one-tablet doses, to take the tablet well before meals to avoid mixing with food, and to refrain from concomitantly eating raw nuts, particularly almonds, or fruit pits.

They should be urged to seek medical assistance promptly if they experience any symptoms suggestive of cyanide toxic reaction, ie, giddiness, nausea and vomiting, hyperpnea, headache, palpitation, cyanosis, an obtundation.

This study says:
Therefore the anti-tumor effect of amygdalin is one of the hots topic in recent years. It has anticancer function by decomposing carcinogenic substances in the body, killing cancer cells, blocking nutrient source of tumor cells, inhibiting cancer cell growth, and could also reduce the incidence of prostate cancer, lung cancer, colon cancer and rectal cancer. It has been manufactured and used to treat cancer in America, Germany, Italy, Japan, Philippines and other 20 countries. It can also ameliorate the symptoms of patients in advanced stage of cancer, and prolong their survival period.

This study says:
Here, we have shown that amygdalin induces apoptotic cell death in human DU145 and LNCaP prostate cancer cells by caspase-3 activation through down-regulation of Bcl-2 and up-regulation of Bax. The present study reveals that amygdalin may offer a valuable option for the treatment of prostate cancers.

This study says:
Amygdalin has also been shown to inhibit the adhesion of breast cancer cells, lung cancer cells and bladder cancer cells by decreased expression of integrin’s, reduction of catenin levels and inhibition of the Akt-mTOR pathway, which may consequently lead to inhibition of metastases of cancer cells. It has also been revealed that amygdalin in renal cancer cells increased expression of p19 protein resulting in inhibition of cell transfer from G1-phase to S-phase, and thus inhibited cell proliferation.

This study says:
So, amygdalin enhances deceleration of cell cycle by blocking cell proliferation and growth. The current review highlights that amygdalin has potential to be used as an anticancer agent in cancer therapy.

This study concludes:
These results suggest that amygdalin have an anticancer effect via downregulation of cell cycle-related genes in SNU-C4 human colon cancer cells, and might be used for therapeutic anticancer drug.

This study says:
In this study, we found that the viability of human cervical cancer HeLa cell line was significantly inhibited by amygdalin…The results in the present study suggest that amygdalin may offer a new therapeutic option for patients with cervical cancer.

This 2015 study says:
These results strongly suggested that amygdalin was likely to have anti-metastatic NSCLC effect. This study offers information of the role of amygdalin that may be useful as a therapeutic target in lung tumors.

This 2015 study says:
In conclusion, exposing RCC [ Renal Cell Carcinoma ] cells to amygdalin inhibits metastatic spread and is associated with downregulation of α5 and α6 integrins. Therefore, amygdalin exerts antitumor activity in vitro in RCC.

This study says:
Amygdalin dose-dependently reduced growth and proliferation in all three bladder cancer cell lines, reflected in a significant delay in cell cycle progression and G0/G1 arrest. Amygdalin, therefore, may block tumor growth by down-modulating cdk2 and cyclin A.

This 2016 study says:
Amygdalin exhibits significant antitumor activity in both castration-sensitive and castration-resistant PCa cell lines and merits further evaluation for therapeutic purposes.

This study says:
In vivo, amygdalin administration inhibited the growth of HeLa cell xenografts through a mechanism of apoptosis. The results in the present study suggest that amygdalin may offer a new therapeutic option for patients with cervical cancer.

This study says:
Taken together, this study demonstrates that amygdalin induces apoptosis and inhibits adhesion of breast cancer cells. The results suggest a potential application of amygdalin as a chemopreventive agent to prevent or alleviate progression of breast cancer, especially TNBC [Triple Negative Breast Cancer ].

The National Cancer Institute Laetrile/Amygdalin (PDQ®)–Patient Version includes the following summary:

Side effects

According to the National Cancer Institute the side effects of laetrile treatment include the following:

The side effects of laetrile depend on the way it is given. Side effects are worse when laetrile is given by mouth. While taking laetrile, side effects get worse when:

Where can I get this treatment and more information?

Laetrile Infusion therapy is available at Hyperthermia-Centre-Hannover
and Oasis of Hope Hospital and a number of other cancer clinics.

Laetrile Case Histories; The Richardson Cancer Clinic Experience by John A. Richardson
Here are 62 case histories proving beyond any doubt that Laetrile (Vitamin B17) works in the control of cancer. These are not anecdotal stories or cases of people who never had cancer in the first place. Each history is authenticated by a firm diagnosis and meticulous medical documentation.


1. Some cancer therapies can conflict with others. Do not start ANY therapy without consulting your doctor to ensure it’s safe and beneficial to do so.
2. Just because any given therapy worked for someone else does not necessarily mean it will work for you.
3. Although there are many viable alternative cancer treatments, there isn’t a “best” treatment for a certain type or stage of cancer.

Page updated 2023

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