• Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  • Subscribe
Dr. Weil Logo Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
Press "Enter" to search
Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
  • Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  1. Home
  2. Health & Wellness
  3. Body, Mind & Spirit
  4. Cancer

Protocel: A Bogus Cancer Cure?

I’ve been reading about Protocel to cure cancer, including lung cancer. What do you think of this treatment?

Andrew Weil, M.D. | October 22, 2010

Portrait of sad Asian with a cup of tea sitting at window
2 min

Not much, and I urge you to avoid it. Protocel® is one of the names given to a mixture of chemical compounds developed in the 1930’s by a chemist named James Sheridan who claimed that that the formula came to him from God in a dream and would cure cancer and other diseases. He called his product Entelev® and eventually gave it to someone else for manufacturing and distribution. According to the American Cancer Society the name of the preparation was then changed to Cancell® and was marketed for about five years before the FDA got an injunction that prohibited sale of the product across state lines on the grounds that it was an adulterated, misbranded, and unapproved new drug. Cancell has now also been renamed, and as Protocel is being sold as a supplement that helps the body remove “unwanted and unproductive cells.”

Promoters have advanced rather interesting theories about how and why it is purported to work, including mechanisms that have to do with cellular energy and the conversion of normal cells to cancer cells. One theory holds that a bacterium called Progenitor cryptocides is activated in the body by improper diet and causes cells to turn malignant. Protocel, which is also marketed as Cantron, supposedly cures the disease by blocking energy production in cancer cells.

In addition to cancer, these supplements have also been promoted for treatment of AIDS, herpes, chronic fatigue syndrome, lupus, endometriosis, Crohn’s disease, fibromyalgia, diabetes, emphysema, scleroderma, Lou Gehrig’s disease (ALS), multiple sclerosis, cystic fibrosis, muscular dystrophy, Parkinson’s disease, Alzheimer’s disease, hemophilia, high and low blood pressure, mental illness and some forms of epilepsy.

There is no evidence to support the existence of the bacterium invoked in the theory on how normal cells become malignant. What’s more, there is no evidence to show that Protocel (or whatever else it is called) has any anti-cancer effect. The National Cancer Institute (NCI) performed animal studies of Entelev/Cancell in 1978 and 1980 and found that it had no anti-cancer activity whatsoever. Another series of NCI tests in 1990 and 1991 using human cancer cells did not find sufficient activity to warrant further testing. And beware: the manufacturer of the supplements claims that chemotherapy interferes with their effectiveness.

If you have cancer, I urge you to rely on tested and proven treatments. They may be imperfect, and should not be used without weighing the risks and benefits, but they have a much better track record than supplements unscrupulously promoted as cures.

Andrew Weil, M.D.

Advertisement
Related Weil Products

Dr. Weil on Healthy Aging for Cancer Support

Dr. Weil on Healthy Aging – Do you or a loved one have cancer? The Dr. Weil on Healthy Aging online guide has simple, effective preventive health information and tools including an exclusive version of Dr. Weil’s Anti-Inflammatory Food Pyramid. Join today and get 14 days free!
Get Started
Dr. Weil on Healthy Aging

Start Your 14-Day Free Trial

Free Newsletters

Stay Connected With Dr. Weil

Anti-Inflammatory Diet

Follow Dr. Weil’s Food Pyramid

Get Dr Weils Newsletter Updates

Exclusive Lifestyle, Nutrition & Health Advice

Dr. Weil's FREE health living advice delivered to you!

By clicking "Subscribe," you agree to the DrWeil.com Terms and Conditions and Privacy Policy. You also agree to receive emails from DrWeil.com, and you may opt out of DrWeil.com subscriptions at any time.

Trending Now

3-d mammograms
Cancer

3-D Mammograms?

a better test for breast cancer
Cancer

A Better Test For Breast Cancer?

HDL Cholesterol & LDL Cholesterol: What They Mean | Heart Health | Andrew Weil, M.D.
Cancer

A Blood Test for Breast Cancer?

a test for ovarian cancer
Cancer

A Test for Ovarian Cancer?

Dr. Weil Logo Weil™ Andrew Weil, M.D.
Dr. Weil's Signature

Exclusive Lifestyle, Nutrition & Health Advice

  • About Us
  • Press Information
  • Advertising
  • Contact Us
  • Terms of Use
  • Privacy Policy
  • Accessibility

Terms of Use | Privacy Policy

Information on this website is provided for informational purposes only and is not intended as a substitute for the advice provided by your physician or other healthcare professional. You should not use the information on this website for diagnosing or treating a health problem or disease, or prescribing any medication or other treatment. Any third party offering or advertising on this website does not constitute an endorsement by Andrew Weil, M.D. or Healthy Lifestyle Brands.

© Copyright 2025 Healthy Lifestyle Brands, LLC. All rights reserved. Reproduction in whole or in part without permission is prohibited. www.drweil.com