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Amounts & Duplicate Ingredients

Amounts and duplicate ingredients: how products with the same effect can add up, the FDA example of several blood-thinning products, and how to check your own list.

Content last updated . This page has not been medically reviewed.

Same effect, more than one product

FDA's example: warfarin, ginkgo, aspirin and vitamin E can each thin the blood, and taking them together may increase the chance of internal bleeding or stroke. [1] The same idea applies to any group of products with a similar effect.

How to check your own list

This is our suggestion, not a sourced finding:
  1. Write down every product with its brand, ingredients, amount per serving and how often you take it. [1]
  2. Look for the same ingredient under different names, including Latin plant names, in more than one product.
  3. Look for products with the same type of effect (for example, several that affect bleeding or sedation).
  4. Give the list to a pharmacist.

Amounts

We do not give amounts for any remedy on this hub page. The label shows the amount per serving, and total intake from several products and fortified foods can add up. Proper evidence for universal safe upper limits across herbs was not found. NIH's Office of Dietary Supplements (nutrient fact sheets) was blocked from our system. [2]

Related

Reading supplement labels · Talking with a health professional

References

  1. U.S. Food and Drug Administration. Mixing Medications and Dietary Supplements Can Endanger Your Health. Read 2026-10-22.
  2. Office of Dietary Supplements (NIH). Fact sheets. Access was blocked (HTTP 403) from our system on 2026-10-22; we did not read it and cite nothing from it.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.