I want to use the activeIngredient property http://health-lifesci.schema.org/activeIngredient to list two active ingredients. What is the proper way to mark it up?

And once it is properly marked up, should it appear in the Google Structured author tool as 2 values assigned to 1 property, as shown below:

activeIngredient     ingredient 1, ingredient 2 

or, does the activeIngredient property need to appear twice, as shown below:

activeIngredient     ingredient 1

activeIngredient     ingredient 2

The link below shows an example where the activeIngredient property is used to describe a single ingredient. It appears at the bottom third of the page. https://search.google.com/structured-data/testing-tool/u/0/#url=http%3A%2F%2Fwww.aleve.com%2F

  • Another way to ask the question is "Can I use commas to delineate a list of active ingredients?"
    – Alan G
    Dec 14, 2017 at 14:36
  • Not necessarily. It might be possible to have multiple activeIngredient schema tags for a single item. I'm not sure exactly how to tell that for sure, but for example the Drug schema says "an active ingredient" rather than "the active ingredient" which implies to me that maybe multiple are allowed. Because it doesn't pluralize "ingredient", that also implies to me that there should be one ingredient per tag. Dec 14, 2017 at 20:58

1 Answer 1


Unless its description says otherwise (example: keywords), a Schema.org property always takes a single value.

If you want to provide multiple values, you have to repeat the property (in case of Microdata and RDFa) or provide an array value (in case of JSON-LD).

So activeIngredient is for one active ingredient. Multiple active ingredients could be specified like this:

  <li itemprop="activeIngredient">ingredient 1</li>
  <li itemprop="activeIngredient">ingredient 2</li>
  <li property="activeIngredient">ingredient 1</li>
  <li property="activeIngredient">ingredient 2</li>
  "ingredient 1",
  "ingredient 2"

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