Supplement Safety Resources: Side Effects, Interactions, Pregnancy, Children, Older Adults, Kidney and Liver, Surgery and Reporting
A guide to supplement safety pages on AlternativeMed: side effects, medicine interactions, pregnancy, children, older adults, kidney and liver, surgery, reporting and recalls, with what the sources say first.
Content last updated . This page has not been medically reviewed.
If this is an emergency
If someone has swallowed too much of a supplement or medicine, or is having a severe reaction, get urgent help now. In the United States call 911 for an emergency or Poison Help at 1-800-222-1222. For other countries see Poison help by country and Poisoning: what to do first. FDA lists signs of a serious reaction that include rash or swelling of the throat, lips or tongue, wheezing, chest pain, fainting, severe persistent vomiting, yellowing of the skin or eyes, and stroke symptoms. [1]How this page works
This page owns no safety content of its own. It points to the full pages in our Natural Remedy Safety section and adds one verified takeaway from official sources so you can see why each page matters. Supplements are not tested like drugs: MedlinePlus says supplements do not have to go through the testing that drugs do. [2]Where to go
| Your question | Start here | One verified point |
|---|---|---|
| Side effects, allergic reactions | More about Side effects, allergic reactions → | NCCIH advises that if you have side effects, stop taking the supplement and contact your health care provider. [3] |
| Medicines | How interactions work, interactions by drug class | NCCIH says supplements may interact with your medications; it gives St. John's wort as an example that makes many medications less effective. [3] |
| Pregnancy and breastfeeding | More about Pregnancy and breastfeeding → | Many dietary supplements have not been tested in pregnant women, nursing mothers or children. [3] |
| Children | More about Children → | The same NCCIH point applies to children. [3] |
| Older adults and many medicines | More about Older adults and many medicines → | The Dietary Guidelines say older adults should track and discuss all dietary supplement use with their health care provider. [4] |
| Kidney and other conditions | Existing conditions, Minerals, supplements and kidney disease | NCCIH says some supplements may harm you if you have a particular medical condition. [3] |
| Liver | More about Liver → | NCCIH says cases of acute liver damage in people taking supplements, though still rare, are being reported more, and some have needed emergency liver transplant. [3] |
| Surgery | More about Surgery → | NCCIH says certain supplements may increase bleeding risk or affect response to anesthesia; tell providers as far ahead as possible. [3] |
| Contamination, recalls, warnings | Product quality and contamination, Unsafe products and warnings | FDA has found prescription drugs in products sold as supplements. [3] |
| Reporting a problem | More about Reporting a problem → | In the US, FDA says to stop using the product and file a report through the Safety Reporting Portal. [1] |
How big is the risk?
Most multivitamin use is low risk: NCCIH says a multivitamin is unlikely to pose health risks. [3] But a 2015 study estimated dietary supplements result in about 23,000 emergency room visits a year in the US, many of them young adults with heart problems from weight-loss or energy products and older adults with swallowing problems from large vitamin pills. [3] Risk depends on the product, the amount and the person.Questions to ask before you start
- Which medicines, conditions, surgery or pregnancy plans could this affect? Use the table above, then see Talking with a health professional.
- Does the label amount fit within a reference limit? See RDA, AI, DV and UL.
- Is the product from a source you can identify? See Quality testing and certifications.
- Is a supplement needed at all? See Do I need a supplement?.
Frequently asked questions
Where do I report a bad reaction to a supplement?
In the US, FDA asks consumers and health care professionals to stop using the product and report through the Safety Reporting Portal. [1] Other countries have their own systems; we did not verify them.
Are natural supplements always safe?
No. NCCIH notes that many supplements come from natural sources but "natural" does not always mean "safe," with kava and liver disease as an example. [3]
Should I stop a prescribed medicine to take a supplement?
No. Never stop a prescribed medicine on your own. Talk with the prescriber or pharmacist first.
References
- U.S. Food and Drug Administration. How to Report a Problem with Dietary Supplements. Read 2026-10-22.
- MedlinePlus (US National Library of Medicine). Dietary Supplements. Read 2026-10-22.
- National Center for Complementary and Integrative Health (NIH). Using Dietary Supplements Wisely. Read 2026-10-22.
- U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2020-2025. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.