Supplement contamination statistics describe several different problems: undeclared pharmaceutical ingredients, WADA-prohibited substances in sports products, and anti-doping cases attributed to supplements. The measures below cover United States FDA warnings from 2007–2016, Australian online products purchased in 2022, findings released in 2025, and one national anti-doping program from 2003–2020.
Key Supplement Contamination Statistics
The most useful headline figures are:
- In United States FDA warnings from 2007–2016, 776 adulterated product records were associated with 146 companies.
- In the United States FDA dataset, 173 products were recorded in 2009, representing 22.3% of the 2007–2016 records.
- In the United States FDA dataset, 123 products were recorded in 2015, representing 15.9% of the 2007–2016 records.
- In United States FDA warnings from 2007–2016, sexual-enhancement products made up 353 of 776 records, or 45.5%.
- In United States FDA warnings from 2007–2016, weight-loss products made up 317 of 776 records, or 40.9%.
- In United States FDA warnings from 2007–2016, muscle-building products made up 92 of 776 records, or 11.9%.
- In the United States sexual-enhancement subset from 2007–2016, 287 of 353 products contained sildenafil or structural analogues, or 81.3%.
- In the United States FDA dataset from 2007–2016, 619 of 776 products contained one hidden ingredient, or 79.8%.
- In the United States FDA dataset from 2007–2016, 157 of 776 products contained at least two unapproved ingredients, or 20.2%.
- In the United States FDA dataset from 2007–2016, 33 of 776 products contained at least three adulterants, or 4.3%.
- In the United States FDA dataset from 2007–2016, 746 distinct products were represented by 776 entries because some products generated multiple warnings.
- In the Australian online sports-supplement sample purchased in 2022, 70 of 200 products contained one or more WADA-prohibited substances, or 35%.
- In the Australian online sample purchased in 2022, 53% of tested muscle builders contained banned substances, according to findings released in 2025.
- In the Australian online sample purchased in 2022, 49% of tested fat burners contained banned substances, according to findings released in 2025.
- In the Australian online sample purchased in 2022, 34% of tested pre-workout supplements contained banned substances, according to findings released in 2025.
- In one national anti-doping program from 2003–2020, 49 of 192 analytical rule-violation cases involved an athlete claim of supplement contamination, or 26%.
- In that national anti-doping study, 27 of the 49 claimed cases had evidence supporting a specific supplement as the source.
- In that national anti-doping study, 27–36 cases were estimated to be supplement-related, or about 14%–19% of all 192 analytical cases.
Contents
- FDA warning statistics and timing
- Categories and hidden ingredients
- Undeclared ingredient counts and repeat findings
- Australian sports-supplement contamination data
- Anti-doping cases and outcomes
- Recalls, notifications, and interpretation
FDA Supplement Contamination Statistics and Warning Trends
The JAMA Network Open analysis of the FDA tainted-supplements database counted 776 adulterated products associated with warnings issued from 2007 through 2016. Those records implicated 146 different dietary-supplement companies, but the authors’ count describes warnings and enforcement surveillance rather than the prevalence of contamination across the entire United States market.
The yearly distribution shows why warning counts should be read as enforcement records. The dataset recorded 173 products in 2009, 92 in 2013, 97 in 2014, 123 in 2015, and 83 in 2016.
| Period | FDA-listed adulterated products | Share of 2007–2016 dataset |
|---|---|---|
| 2009 | 173 | 22.3% |
| 2013 | 92 | 11.9% |
| 2014 | 97 | 12.5% |
| 2015 | 123 | 15.9% |
| 2016 | 83 | 10.7% |
The article attributes the 2009 spike mainly to two large recalls naming 99 products. From 2012 through 2016, FDA reports covered 443 products, or 57.1% of the 776-product dataset; this is a source-based period share, not a market trend estimate.
Supplement Contamination Categories and Hidden-Ingredient Data
The FDA warning records were concentrated in three product categories. Sexual-enhancement products accounted for 353 records, weight-loss products for 317, and muscle-building products for 92; the remaining 14 were classified as other categories.
| FDA warning category, 2007–2016 | Products | Share of 776 |
|---|---|---|
| Sexual enhancement | 353 | 45.5% |
| Weight loss | 317 | 40.9% |
| Muscle building | 92 | 11.9% |
| Other categories | 14 | 1.8% |
Within the 353-product sexual-enhancement subset, sildenafil or structural analogues appeared in 287 products, or 81.3%. Sildenafil itself appeared in 166 products, structural analogues in 134, tadalafil in 72, other PDE5 inhibitors or analogues in 27, dapoxetine in 14, and sibutramine in two.
These ingredient figures can overlap because one product could contain more than one hidden drug. More than one hidden drug ingredient appeared in 65 sexual-enhancement products, or 18.4% of that category’s adulterated records.
The source is the JAMA Network Open FDA-warning analysis. Its category percentages describe warned adulterated products, not all sexual-enhancement, weight-loss, muscle-building, or other supplements sold.
How Many Undeclared Ingredients Appear in Contaminated Supplements?
The FDA warning records also show the number of hidden ingredients identified per product. Of 776 records, 619 contained one hidden ingredient, 124 contained two, 25 contained three, five contained five, and two contained six.
- At least two unapproved ingredients appeared in 157 of 776 products, or 20.2%, in the 2007–2016 United States FDA-warning dataset.
- At least three adulterants appeared in 33 of 776 products, or 4.3%, in that same dataset.
The 33 products with at least three adulterants included 16 weight-loss products, 13 sexual-enhancement products, and four products with other indications. Within this high-adulterant subset, weight-loss products represented 48.5%, sexual-enhancement products 39.4%, and other indications 12.1%.
The database contained 746 distinct products because some products generated multiple warnings. Among those distinct products, 718 had one positive testing occurrence, or 96.2%, while 28 had two or three positive testing occurrences, or 3.8%; 26 were positive twice and two were positive three times.
Nineteen of the 28 repeatedly warned products, or 67.9%, had new ingredients in a later warning.
These are FDA testing and warning records, not manufacturing-batch counts or a random market sample. Source: JAMA Network Open FDA-warning analysis.
Australian Sports-Supplement Contamination Statistics
Sport Integrity Australia and HASTA tested 200 sports-supplement products purchased online in Australia in 2022; the findings were released in 2025. The products had not been independently batch-tested before purchase, so the sample represents a targeted online marketplace selection rather than all supplements sold in Australia.
| Australian online product group | Reported positive rate | Measurement context |
|---|---|---|
| All tested sports supplements | 35% | 70 of 200 contained one or more WADA-prohibited substances |
| Muscle builders | 53% | Category denominator not stated on the page |
| Fat burners | 49% | Category denominator not stated on the page |
| Pre-workouts | 34% | Category denominator not stated on the page |
The overall result means 70 of the 200 tested products contained one or more WADA-prohibited substances. Sport Integrity Australia’s category page reports rates of 53% for muscle builders, 49% for fat burners, and 34% for pre-workouts, but it does not state the exact category sample sizes on the page.
Sources: Sports Supplements Survey Finds Banned Substances and Supplements in sport.
Supplement Contamination Statistics in Anti-Doping Cases
A peer-reviewed study of one national anti-doping program recorded 192 analytical anti-doping rule-violation cases from 2003 through 2020. Athletes claimed supplement contamination in 49 cases, or 26%, but that figure measures claims rather than confirmed contamination in every case.
Evidence supporting a specific supplement as the source was found in 27 of those 49 claimed cases. Those 27 cases represented 14% of all 192 analytical cases; including nine additional cases not excluded by committees, the study estimated that 27–36 cases, or about 14%–19%, could be supplement-related.
Among the 49 claimed supplement-related cases, stimulants accounted for 28, or 57%, while anabolic substances accounted for 17, or 35%. Methylhexanamine was associated with 16 of the 24 stimulant-related cases in the study’s detailed breakdown.
Product types were also recorded: multi-ingredient pre-workouts were implicated in 20 of the 49 claimed cases, while fat-burning products were implicated in four. The study covers one national program, so its case proportions are not a universal rate for global anti-doping cases.
Source: Dietary Supplements as a Major Cause of Anti-doping Rule Violations.
Supplement Recalls, Public Notifications, and Risk Interpretation
FDA warning actions in the 2007–2016 records included 360 voluntary recalls, or 46.4% of 776 product records, and 342 public notifications, or 44.1%. These action shares describe FDA records and should not be interpreted as measures of recall effectiveness.
FDA educational material also states that dietary supplements represented 2% of more than 800 FDA recalls initiated in 2019. That 2019 figure covers all dietary-supplement recalls, not only contamination recalls, and its denominator is described as more than 800.
The central measurement distinction is important. FDA and JAMA facts concern undeclared or unapproved pharmaceutical ingredients, Australian findings concern WADA-prohibited substances in non-batch-tested sports supplements, and the anti-doping study concerns cases attributed or potentially attributed to supplements.
Accordingly, the figures should not be combined into a single market-wide contamination rate. The FDA counts are surveillance and enforcement records, the Australian 200-product study is a targeted online sample, and the anti-doping figures come from one national program and include claims and evidentiary classifications.
Source for the FDA warning and recall figures: Unapproved Pharmaceutical Ingredients Included in Dietary Supplements Associated With US Food and Drug Administration Warnings.