The IOC's 2018 review found good evidence for only a small set of sports supplements, and only in some settings. It also warned about side effects, weak claims, contamination, and doping risk.
Verdict: this is not a blacklist. It is a way to screen a product. Look for a clear dose, one stated job, evidence for that job, and a testing claim you can check.
Four questions expose most of the uncertainty.
- What job does it do?
- What dose am I taking?
- Have I used it in hard work?
- Can I verify the batch-testing claim?
An unclear answer does not prove harm. It means the product has not earned confidence yet.
A named blend may hide the amount of each part. You then cannot count your full dose, especially if you also get caffeine from coffee or gels.
USADA warns that a supplement label may be wrong or incomplete. A hidden dose creates one more unknown.
“Fat burner” does not explain how a product works or how strong the evidence is. It may mix stimulants and herbs while leaving the promised result vague.
Ask what each part does, how much the product gives, and whether a similar group of people was studied.
“Detox” is not a measured sports result. Some teas and pills simply contain laxatives or ingredients that increase urine output.
Fluid loss or an urgent bowel trip can spoil a run-and-station event. Neither effect is proof that a detox worked.
The body needs magnesium, but a “recovery” label does not show that you lack it. A high dose from supplements can cause diarrhoea.
There is a clear difference between treating a confirmed shortfall and adding a large dose because training feels hard.
Iron can help correct a diagnosed lack of iron. That is not the same as taking it for general energy.
The IOC report notes gut effects and other risks when iron is used without need. A clinician should assess the need; the front label cannot.
The IOC review says sodium bicarbonate may help in some forms of hard exercise. It can also cause gut trouble.
That trade-off makes a new race-day dose a poor test. The ingredient is not always bad; an untested plan is the red flag.
The AIS says a small caffeine dose of about 2–3 mg/kg can work, but people respond in different ways.
Coffee, pre-workout, gels, and energy drinks all contribute to one total. Reviewing each product alone hides the stack.
Sleep gummies may mix melatonin, herbs, magnesium, and more. If you feel groggy the next morning, a blend makes the cause hard to trace.
The red flag is trying several active ingredients at once when the goal is simply a normal night's sleep.
A muscle “pump” does not mean faster running, better sled work, or a faster HYROX time.
If the sales claim and your goal do not match, the product lacks a clear job before side effects are even weighed.
No testing badge removes all risk. USADA still advises athletes to use a sound third-party programme, such as NSF Certified for Sport, to lower it.
A logo is only a claim until you find the product and batch in the tester's current records. Under WADA rules, athletes are responsible for banned substances found in their samples.
The same four flaws keep returning: hidden dose, vague purpose, weak evidence, and a testing claim that cannot be checked. A product without those flaws is easier to judge, though never risk-free.
The IOC's conclusion is modest. Supplements may offer a small gain in a few cases, but finding those cases takes more work than reading the front of a tub.
Sources
This article reports on peer-reviewed scientific research published in named journals. All findings are attributed to their source studies and researchers. CleanLabel° is not a medical publication and does not provide health advice. Nothing in this article constitutes a diagnosis, treatment recommendation, or substitute for consultation with a qualified healthcare professional. If you are experiencing symptoms or have a health concern, speak to a registered doctor or dietitian.