Medical Disclaimer

SupplementsGo publishes consumer information about supplement products. It does not provide medical advice, and nothing on this site is a substitute for advice from a qualified healthcare professional who knows your history.

Please speak to a professional first

Talk to a doctor, pharmacist or registered dietitian before starting a supplement if any of the following apply to you. This is not an exhaustive list.

• You take prescription medication of any kind. Supplement–drug interactions are common and are not always obvious — anticoagulants, thyroid medication, antidepressants, immunosuppressants and antibiotics all have well-documented interactions with widely sold supplements.
• You are pregnant, planning a pregnancy, or breastfeeding.
• You have a diagnosed condition, particularly involving the liver, kidneys, heart or thyroid.
• You are scheduled for surgery.
• You are buying for a child.
• You are considering a dose above the amount stated on the label.

Symptoms are not a shopping list

If you are experiencing symptoms, the useful step is a diagnosis, not a supplement. Deficiency is diagnosed with a test, not inferred from a list of symptoms on a website — including this one. Self-treating a suspected deficiency can delay the identification of something else.

More is not safer

Several nutrients have established upper intake levels, and some — iron and the fat-soluble vitamins A, D, E and K among them — accumulate. Where we quote an upper limit, we cite the authority that set it. Those limits apply to total intake from all sources, including fortified food and other supplements you may already be taking.

Ingredient evidence is not product evidence

Where our guides describe research, that research concerns an ingredient. It is not a claim that any specific product produces the same result. Supplements are not required to demonstrate efficacy before sale in the way medicines are, and manufacturing quality varies between brands.

Regulatory position

Statements on this site have not been evaluated by the U.S. Food and Drug Administration or by any other regulator. No product listed here is intended to diagnose, treat, cure or prevent any disease.

If you think you are having a reaction

Stop taking the product and contact a healthcare professional. In an emergency, contact your local emergency services. Adverse events involving supplements can be reported to the FDA through MedWatch, or in the UK through the Yellow Card scheme.