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Knowing what not to take before blood work helps ensure accurate test results. Certain supplements, vitamins, and substances can temporarily influence blood values such as glucose, lipid levels, liver enzymes, or mineral concentrations, which may lead to misleading readings if taken shortly before a blood draw.
\n\nSupplements and Substances to Avoid Before Blood Tests
\n\nWhile specific instructions depend on the type of test, common examples of what to hold off on include:
\n\n- \n
- Multivitamins and mineral supplements – products containing biotin, iron, or other minerals can interfere with certain laboratory measurements. \n
- High-dose vitamin supplements – large doses taken just before testing may affect nutrient level results. If you use products like multivitamins, ask your healthcare provider whether to pause them before your test. \n
- Herbal supplements – botanicals such as turmeric or ashwagandha can influence some blood parameters, so timing matters. \n
- Food and drinks (when fasting is required) – for fasting glucose or cholesterol panels, avoid all food, coffee, and sugary beverages for the recommended period, typically 8–12 hours. \n
- Alcohol – best avoided for at least 24 hours, as it can affect liver enzymes and lipid values. \n
Practical Tips Before Your Appointment
\n\nAlways follow the fasting and preparation instructions provided by your doctor or laboratory. Bring a list of the supplements you take, including B vitamins and other daily products, so results can be interpreted in context. Unless advised otherwise, take prescription medications with water as usual, and confirm with a healthcare professional before stopping any supplement.
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