This code system http://hl7.org/fhir/ingredient-manufacturer-role defines the following codes:

Code Display
allowed Manufacturer is specifically allowed for this ingredient
possible Manufacturer is known to make this ingredient in general
actual Manufacturer actually makes this particular ingredient
<status value="draft"/> <experimental value="false"/> <date value="2021-01-05T10:01:24+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="The way in which this manufacturer is associated with the ingredient. For example whether it is a possible one (others allowed), or an exclusive authorized one for this ingredient. Note that this is not the manufacturing process role"/> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/ingredient-manufacturer-role"/> <content value="complete"/> <concept> <code value="allowed"/> <display value="Manufacturer is specifically allowed for this ingredient"/> </concept> <concept> <code value="possible"/> <display value="Manufacturer is known to make this ingredient in general"/> </concept> <concept> <code value="actual"/> <display value="Manufacturer actually makes this particular ingredient"/> </concept> </CodeSystem>