Contamination, Adulteration and Recalls in Multi-Ingredient Formulas

If someone is ill after taking a product

Stop using the product and contact a health care provider. FDA lists serious reactions that should prompt a report, including chest pain, bleeding, yellowing of the skin or eyes, and signs of stroke. [1] For a possible poisoning, including a child who swallowed supplements, call Poison Help at 1-800-222-1222 in the US, or 911 in an emergency. See poisoning: what to do first and, for other countries, Poison Help by country. Keep the container and label.

What the words mean

• Contamination: something unwanted is in the product, such as a toxic metal. The US manufacturing rule tells makers to set limits on types of contamination that may adulterate a supplement. [2]
• Adulteration: the product is not what the law allows. FDA gives hidden ingredients as an example: ingredients not on the label, often prescription drug ingredients, banned substances or harmful chemicals. [3]
• Recall: a company or FDA action to remove a product from the market. FDA says its public recall list does not include every recall. [4]

In the US, makers and distributors have the first responsibility for safety, and FDA can act on adulterated or misbranded supplements after they reach the market. [5][6] A 2017 review also states that amendments to the US food and drug law gave FDA mandatory recall authority. [7]

What research and FDA found

1. How many adulterated supplements did FDA warn about?

   Analysis of FDA warnings; counts what FDA found, not all products on the market

   From 2007 through 2016, 776 adulterated products and 146 companies were identified in FDA's tainted-products database; most were sold for sexual enhancement, weight loss or muscle building [8]

2. Which drugs were found?

   Same study; one product category

   Sibutramine in 269 of 317 weight-loss products (84.9 percent) [8]

3. Did repeat warnings find new drugs?

   Same study

   19 of 28 products named in two or three warnings were reported to contain new unapproved ingredients later [8]

4. How accurate were labels in one product type?

   Small case series; do not generalize to all formulas

   In 44 weight-loss supplements bought near US military bases, 36 (82 percent) had inaccurate labels and 16 (36 percent) had hidden ingredients [9]

5. Is the FDA database a full list?

   FDA statement

   No. FDA says its health fraud database covers only a small fraction of the contaminated products on the market, and a product not on the list is not shown to be safe [3]

6. Do metals occur in supplements?

   Laboratory reference-material study; not a survey of retail products

   A 2024 NIST study notes that arsenic, cadmium, lead and mercury are a potential source of exposure in botanical supplement products, and that extraction can leave levels unchanged or even higher [10]

7. Are contaminated products linked to illness?

   Patients with injury at one hospital; it cannot show how common this is. Not a US retail sample

   A 2026 case series of 386 products from patients with liver injury in India found metals above WHO limits in many products and undeclared drugs in 27.7 percent [11]

8. Rates in multi-ingredient formulas vs single ingredients?

   Not applicable

   Proper evidence not found. We searched PubMed for recalls, adulteration and label accuracy and read FDA's recall, health fraud and supplement pages; none compared the two

One case report describes Cushing's syndrome after use of a joint supplement that FDA had recalled for undeclared dexamethasone, a steroid. [12] A single case shows the harm is possible, not how often it happens.

Where hidden drugs are most often found

NCCIH says products promoted mainly for weight loss, sexual enhancement and bodybuilding may contain prescription drugs not allowed in supplements. [13] FDA adds energy, pain and sleep products to the list to be wary of, and says "natural" or "herbal" on a label does not make a product safe. [3] See weight loss and fat-burner blends and label red flags.

How to check for a recall or warning

1. Search FDA's recalls, market withdrawals and safety alerts page, which can be filtered by product type including dietary supplements. [4]
2. Search FDA's health fraud product database, where products found with hidden ingredients are added. [3]
3. Compare the product name, lot number and dates on your bottle with the notice. FDA notices are the source; third-party lists may be incomplete.
4. Recalls stay on FDA's page for three years before being archived. [4]

Reporting and clinicians

You can report a suspicious product so FDA can test it for hidden ingredients. [3] Adverse events go to FDA's Safety Reporting Portal. [1] See side effects and reporting and product quality and contamination.

Tell your clinician or pharmacist about every supplement you take, especially if you are pregnant or breastfeeding, give supplements to children, have kidney or liver disease, take prescription medicines or have surgery planned. [13] Do not stop a prescribed medicine on your own.