Dietary Supplements: What Is Safe?

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More information from your American Cancer Society

We have selected some related information that may also be helpful to you. These materials may be ordered from our toll-free number, 1-800-227-2345, or read on our website,

Complementary and Alternative Methods and Cancer

Placebo Effect

Learning About New Cancer Treatments

Learning About New Cancer Prevention Methods

American Cancer Society Operational Statement on Complementary and Alternative Methods of Cancer Management

Clinical Trials: What You Need to Know

Along with the above, information on many different types of complementary and alternative treatments are available at no cost to you from the American Cancer Society. You can find it in the “Complementary and Alternative Medicine” section of our website or request it by calling our toll-free number, 1-800-227-2345.

Your American Cancer Society also has books that you might find helpful. Call us at 1-800-227-2345 or visit our bookstore online at to find out about costs or to place an order.

National organizations and websites*

Along with the American Cancer Society, other sources of information and support include:

National Institutes of Health Office of Dietary Supplements
Telephone: 301-435-2920

    Excellent information about wise supplement use and detailed fact sheets about individual vitamins and supplements. Also has an app you can use to keep up with supplements on your smart phone; choose My Dietary Supplements Mobile App on the left menu bar.

US Food and Drug Administration
Toll-free number: 1-888-INFO-FDA (1-888-463-6332)

    Information about labels, rules, regulations, and more about dietary supplements as well as tips for spotting frauds and scams

US Department of Agriculture, Food and Nutrition Information Center
Telephone: 301-504-5414

    Choose “Dietary Supplements” from the left menu bar for info on nutrients, botanicals, herbs, and access to the International Bibliographic Information on Dietary Supplements (IBIDS) database

Memorial Sloan Kettering Cancer Center
About Herbs and Botanicals

    Provides evidence-based information about herbs, botanicals, supplements, and more, for consumers and health care professionals

Toll-free number: 1-800-FDA-1088 (1-800-332-1088)

    Choose “Consumer-Friendly Reporting Form” if you wish to report an adverse event; or you can call them to report any ill effects

US Pharmacopeia (USP)
Toll-free number: 1-800-227-8772

    More about USP and NF, and their standards

National Council Against Health Fraud

    Offers information on health myths, fraud, and quackery as public health problems, using the principles of science to help consumers avoid scams

*Inclusion on this list does not imply endorsement by the American Cancer Society.

No matter who you are, we can help. Contact us anytime, day or night, for information and support. Call us at 1-800-227-2345 or visit

Last Medical Review: 11/22/2013
Last Revised: 06/02/2014